rserv replication toolkit from Vadim Mikheev.

25 years ago · 54f2b601ef
parent 96edf0c185
commit 54f2b601ef
19 changed files with 2644 additions and 0 deletions
--- a/contrib/rserv/ApplySnapshot.in
+++ b/contrib/rserv/ApplySnapshot.in
@ -0,0 +1,52 @@
+# -*- perl -*-
+# ApplySnapshot
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+    & eval 'exec perl -S $0 $argv:q'
+    if 0;
+
+use lib "@LIBDIR@";
+use IO::File;
+use RServ;
+use Getopt::Long;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "help",
+		     "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+my $snapshot = $opt_snapshot || "__Snapshot";
+
+if (defined($opt_help) || (scalar(@ARGV) < 1)) {
+    print "Usage: $0 --host=name --user=name --password=string slavedb\n";
+    exit ((scalar(@ARGV) < 1)? 1:0);
+}
+
+my $slave = $ARGV[0] || "slave";
+
+my $sinfo = "dbname=$slave";
+$sinfo = "$sinfo host=$opt_host" if (defined($opt_host));
+$sinfo = "$sinfo user=$opt_user" if (defined($opt_user));
+$sinfo = "$sinfo password=$opt_password" if (defined($opt_password));
+
+my $conn = Pg::connectdb(sinfo);
+
+my $inpf = new IO::File;
+$inpf = STDIN;
+
+$res = ApplySnapshot ($conn, $inpf);
+
+if ($res > 0)
+{
+	printf STDERR "Snapshot applied\n";
+}
+elsif ($res != 0)
+{
+	printf STDERR "ERROR\n";
+	exit(1);
+}
+
+exit(0);
--- a/contrib/rserv/CleanLog.in
+++ b/contrib/rserv/CleanLog.in
@ -0,0 +1,47 @@
+# -*- perl -*-
+# CleanLog
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+    & eval 'exec perl -S $0 $argv:q'
+    if 0;
+
+use lib "@LIBDIR@";
+
+use Getopt::Long;
+use RServ;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "help", "snapshot=s",
+		     "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+my $snapshot = $opt_snapshot || "__Snapshot";
+
+if (defined($opt_help) || (scalar(@ARGV) < 2) || ($ARGV[1] !~ /^\d+$/)) {
+    print "Usage: $PROGRAM_NAME --host=name --user=name --password=string masterdb syncid\n";
+    exit ((scalar(@ARGV) < 2)? 1: 0);
+}
+
+my $dbname = $ARGV[0];
+my $howold = $ARGV[1];
+
+my $minfo = "dbname=$dbname";
+$minfo = "$minfo host=$opt_host" if (defined($opt_host));
+$minfo = "$minfo user=$opt_user" if (defined($opt_user));
+$minfo = "$minfo password=$opt_password" if (defined($opt_password));
+
+print "Master connection is $minfo\n" if ($debug);
+print "Slave connection is $sinfo\n" if ($debug);
+
+my $conn = Pg::connectdb($minfo);
+
+$res = CleanLog($conn, $howold);
+
+exit(1) if $res < 0;
+
+printf STDERR "Deleted %d log records\n", $res if $res > 0;
+
+exit(0);
--- a/contrib/rserv/GetSyncID.in
+++ b/contrib/rserv/GetSyncID.in
@ -0,0 +1,55 @@
+# -*- perl -*-
+# GetSyncID
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+    & eval 'exec perl -S $0 $argv:q'
+    if 0;
+
+use lib "@LIBDIR@";
+
+use Pg;
+use Getopt::Long;
+use RServ;
+
+$| = 1;
+
+my $verbose = 1;
+
+$result = GetOptions("debug!", "verbose!", "help",
+		     "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose if (defined($opt_verbose));
+
+if (defined($opt_help) || (scalar(@ARGV) < 1)) {
+    print "Usage: $0 --host=name --user=name --password=string slavedb\n";
+    exit ((scalar(@ARGV) < 1)? 1: 0);
+}
+
+my $dbname = $ARGV[0];
+
+my $sinfo = "dbname=$dbname";
+$sinfo = "$sinfo host=$opt_host" if (defined($opt_host));
+$sinfo = "$sinfo user=$opt_user" if (defined($opt_user));
+$sinfo = "$sinfo password=$opt_password" if (defined($opt_password));
+
+if ($verbose) { print "Connecting to '$sinfo'\n" };
+my $conn = Pg::connectdb($sinfo);
+
+$res = GetSyncID($conn);
+
+die "ERROR\n" if $res < 0;
+
+if (! defined $res)
+{
+    printf STDERR "No SyncID found\n";
+}
+else
+{
+    print("Last SyncID applied: ") if ($verbose);
+    printf "%d", $res;
+    print("\n") if ($verbose);
+}
+
+exit(0);
--- a/contrib/rserv/InitRservTest.in
+++ b/contrib/rserv/InitRservTest.in
@ -0,0 +1,259 @@
+#!/bin/sh
+# InitRservTest
+# erServer demonstration implementation
+# (c) 2000 Vadim Mikheev, PostgreSQL Inc.
+
+[ -n "$RSERV_PERL" ] || RSERV_PERL=@LIBDIR@
+[ -n "$RSERV_SQL" ] || RSERV_SQL=@SQLDIR@
+[ -n "$RSERV_BIN" ] || RSERV_BIN=@BINDIR@
+export RSERV_PERL
+export RSERV_SQL
+export RSERV_BIN
+
+pargs=
+
+while [[ $1 == -* ]]; do
+    case "$1" in
+	--user)
+	    shift
+	    pargs="$pargs -U $1"
+	    ;;
+	--host)
+	    shift
+	    pargs="$pargs -h $1"
+	    ;;
+	*)
+	    echo "Usage: $0 --user name --host name masterdb slavedb"
+	    exit 1
+	    ;;
+    esac
+    shift
+done
+
+masterdb=$1
+slavedb=$2
+
+[ "${masterdb}" != "" ] || masterdb=master
+[ "${slavedb}" != "" ] || slavedb=slave
+
+echo "Master -> $masterdb"
+echo "Slave  -> $slavedb"
+
+############################################################################
+
+fill()
+{
+	table="create table test (i text, k int, l int);
+copy test from stdin;
+Line: 1	1	1
+Line: 2	2	2
+Line: 3	3	3
+Line: 4	4	4
+Line: 5	5	5
+Line: 6	6	6
+Line: 7	7	7
+Line: 8	8	8
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+Line: 69	69	69
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+Line: 71	71	71
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+Line: 93	93	93
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+Line: 95	95	95
+Line: 96	96	96
+Line: 97	97	97
+Line: 98	98	98
+Line: 99	99	99
+Line: 100	100	100
+\\.";
+	echo "$table" | psql $pargs $1 || exit
+	if [ "$1" = "$masterdb" ]
+	then
+		rm -rf __tmpf__
+		psql $pargs -c "select * into table testoid from test" $1 || exit
+		psql $pargs -c "copy testoid with oids to '`pwd`/__tmpf__'" $1 || exit
+		psql $pargs -c "select * into table teststr from test" $1 || exit
+	else
+		psql $pargs -c "select * into table testoid from test where k < 0" $1 || exit
+		psql $pargs -c "copy testoid with oids from '`pwd`/__tmpf__'" $1 || exit
+		psql $pargs -c "select * into table teststr from test" $1 || exit
+		rm -rf __tmpf__
+	fi
+	psql $pargs -c "create unique index i_test on test (k)" $1 || exit
+	psql $pargs -c "create unique index i_testoid on testoid (oid)" $1 || exit
+	psql $pargs -c "create unique index i_teststr on teststr (i)" $1 || exit
+	psql $pargs -c vacuum $1 || exit
+}
+
+############################################################################
+
+echo
+echo
+echo '                            ATTENTION'
+echo
+echo This script will destroy databases with names MASTER and SLAVE
+echo
+echo -n "Are you going to continue ? [Y/N] "
+
+read answ
+
+case $answ in
+    Y*|y*)
+        ;;
+    *)
+        exit
+        ;;
+esac
+
+echo
+echo
+
+sql="drop database $masterdb"
+echo $sql
+psql $pargs -c "$sql" template1
+sql="create database $masterdb"
+echo $sql
+psql $pargs -c "$sql" template1 || exit
+
+echo Setup master system
+psql $pargs $masterdb < $RSERV_SQL/master.sql || exit
+
+echo Wait for template1 to become available...
+sleep 1
+
+sql="drop database $slavedb"
+echo $sql
+psql $pargs -c "$sql" template1
+sql="create database $slavedb"
+echo $sql
+psql $pargs -c "$sql" template1 || exit
+
+echo Setup slave system
+psql $pargs $slavedb < $RSERV_SQL/slave.sql || exit
+
+echo Create and fill test, testoid and teststr tables in master db
+fill $masterdb
+echo
+echo Register test, testoid and teststr tables for replication on master
+echo
+$RSERV_BIN/MasterAddTable $masterdb test k
+$RSERV_BIN/MasterAddTable $masterdb testoid oid
+$RSERV_BIN/MasterAddTable $masterdb teststr i
+
+echo Create and fill test, testoid and teststr tables in slave db
+fill $slavedb
+echo
+echo Register test, testoid and teststr tables for replication on slave
+echo
+$RSERV_BIN/SlaveAddTable $slavedb test k
+$RSERV_BIN/SlaveAddTable $slavedb testoid oid
+$RSERV_BIN/SlaveAddTable $slavedb teststr i
+
+echo 
+echo 
+echo 
+echo 
+echo 
+echo 
+echo 
+echo 
+echo "            Now make changes in $masterdb db and run"
+echo 
+echo "                Replicate $masterdb $slavedb"
+echo 
+echo "            to replicate the master on the slave."
+echo 
+echo "            You may also use the RservTest tcl utility"
+echo "            to demonstrate this functionality."
+echo 
+echo 
+echo 
+echo 
+echo 
+echo 
+echo 
+echo 
+
+exit
+
+############################################################################
--- a/contrib/rserv/Makefile
+++ b/contrib/rserv/Makefile
@ -0,0 +1,59 @@
+# Makefile for erServer demonstration implementation
+# (c) 2000 Vadim Mikheev, PostgreSQL Inc.
+
+#vpath %.pl perl
+#vpath %.pm perl
+
+subdir = contrib/rserv
+top_builddir = ../..
+include $(top_builddir)/src/Makefile.global
+
+NAME	= rserv
+OBJS	= $(NAME).o
+DOCS	= README.$(NAME)
+SQLS	= master.sql slave.sql
+TCLS	= RservTest
+PERLS	= MasterInit SlaveInit MasterAddTable SlaveAddTable Replicate CleanLog
+PERLS	+= PrepareSnapshot ApplySnapshot GetSyncID SyncSyncID
+LIBS	= RServ.pm
+SCRIPTS	= InitRservTest
+MODS	= $(OBJS:.o=$(DLSUFFIX))
+
+override CPPFLAGS += -I$(srcdir)
+override CFLAGS += $(CFLAGS_SL)
+
+INPUTFILES = $(wildcard *.in)
+CLEANFILES = $(INPUTFILES:.in=)
+CLEANFILES += $(OBJS) $(MODS)
+
+.PHONY: all install installdirs tarball
+
+all: $(SQLS) $(TCLS) $(PERLS) $(SCRIPTS) $(MODS)
+
+install: all installdirs
+	$(INSTALL_DATA) $(SQLS) $(libdir)/contrib
+	$(INSTALL_SCRIPT) $(TCLS) $(PERLS) $(SCRIPTS) $(bindir)
+	$(INSTALL_SCRIPT) $(LIBS) $(libdir)/contrib
+	$(INSTALL_SHLIB) $(MODS) $(libdir)/contrib
+	$(INSTALL_DATA) $(DOCS) $(docdir)/contrib/$(NAME)
+
+installdirs:
+	$(mkinstalldirs) $(datadir)/contrib $(libdir)/contrib $(docdir)/contrib/$(NAME)
+
+%.sql: %.sql.in
+	rm -f $@; \
+	C=`pwd`; \
+	sed -e "s:_OBJWD_:$(libdir)/contrib:g" \
+	    -e "s:_DLSUFFIX_:$(DLSUFFIX):g" < $< > $@
+
+%: %.in
+	sed -e "s:_OBJWD_:$(libdir)/contrib:g" \
+	    -e "s:_DLSUFFIX_:$(DLSUFFIX):g" \
+	    -e "s:@SQLDIR@:$(libdir)/contrib:g" \
+	    -e "s:@BINDIR@:$(bindir):g" \
+	    -e "s:@LIBDIR@:$(libdir)/contrib:g" < $< > $@
+	chmod 775 $@
+
+clean:
+#	@echo "Removing $(CLEANFILES)"
+	rm -f $(CLEANFILES)
--- a/contrib/rserv/MasterAddTable.in
+++ b/contrib/rserv/MasterAddTable.in
@ -0,0 +1,61 @@
+# -*- perl -*-
+# MasterAddTable
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+    & eval 'exec perl -S $0 $argv:q'
+    if 0;
+
+use Pg;
+use Getopt::Long;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "help",
+		     "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+
+if (defined($opt_help) || (scalar(@ARGV) < 3)) {
+    print "Usage: $0 --host=name --user=name --password=string masterdb table column\n";
+    exit ((scalar(@ARGV) < 3)? 1: 0);
+}
+
+my $dbname = $ARGV[0];
+my $table = $ARGV[1];
+my $keyname = $ARGV[2];
+
+my $minfo = "dbname=$dbname";
+$minfo = "$minfo host=$opt_host" if (defined($opt_host));
+$minfo = "$minfo user=$opt_user" if (defined($opt_user));
+$minfo = "$minfo password=$opt_password" if (defined($opt_password));
+
+my $conn = Pg::connectdb($minfo);
+
+my $result = $conn->exec("BEGIN");
+die $conn->errorMessage if $result->resultStatus ne PGRES_COMMAND_OK;
+
+$result = $conn->exec("select pgc.oid, pga.attnum from pg_class pgc" . 
+					  ", pg_attribute pga where pgc.relname = '$table'" .
+					  " and pgc.oid = pga.attrelid" . 
+					  " and pga.attname = '$keyname'");
+die $conn->errorMessage if $result->resultStatus ne PGRES_TUPLES_OK;
+
+my @row = $result->fetchrow;
+die "Can't find table/key\n" if ! defined $row[0] || ! defined $row[1];
+
+$result = $conn->exec("create trigger _RSERV_TRIGGER_T_ after" . 
+					  " insert or update or delete on $table" .
+					  " for each row execute procedure" . 
+					  " _rserv_log_('$row[1]')");
+die $conn->errorMessage if $result->resultStatus ne PGRES_COMMAND_OK;
+
+$result = $conn->exec("insert into _RSERV_TABLES_ (tname, cname, reloid, key)" . 
+					  " values ('$table', '$keyname', $row[0], $row[1])");
+die $conn->errorMessage if $result->resultStatus ne PGRES_COMMAND_OK;
+
+$result = $conn->exec("COMMIT");
+die $conn->errorMessage if $result->resultStatus ne PGRES_COMMAND_OK;
+
+exit(0);
--- a/contrib/rserv/MasterInit.in
+++ b/contrib/rserv/MasterInit.in
@ -0,0 +1,107 @@
+# -*- perl -*-
+# MasterInit
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+    & eval 'exec perl -S $0 $argv:q'
+    if 0;
+
+use Pg;
+use Getopt::Long;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "help",
+		     "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+
+if (defined($opt_help) || (scalar(@ARGV) < 1)) {
+    print "Usage: $0 --host=name --user=name --password=string masterdb\n";
+    exit ((scalar(@ARGV) < 1)? 1:0);
+}
+
+my $master = $ARGV[0] || "master";
+
+my $minfo = "dbname=$master";
+$minfo = "$minfo host=$opt_host" if (defined($opt_host));
+$minfo = "$minfo user=$opt_user" if (defined($opt_user));
+$minfo = "$minfo password=$opt_password" if (defined($opt_password));
+
+sub RollbackAndQuit {
+    $conn = shift @_;
+
+    print STDERR "Error in query: ", $conn->errorMessage;
+    $conn->exec("ROLLBACK");
+    exit (-1);
+}
+
+my $conn = Pg::connectdb($minfo);
+if ($conn->status != PGRES_CONNECTION_OK) {
+    print STDERR "Failed opening $minfo\n";
+    exit 1;
+}
+
+my $result = $conn->exec("BEGIN");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("set transaction isolation level serializable");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+# List of slave servers
+$result = $conn->exec("create table _RSERV_SERVERS_" .
+					  " (server serial, host text, post int4, dbase text)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+# List of replicated tables
+$result = $conn->exec("create table _RSERV_TABLES_" .
+					  " (tname name, cname name, reloid oid, key int4)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+# Bookkeeping log for row replication
+$result = $conn->exec("create table _RSERV_LOG_" .
+					  " (reloid oid, logid int4, logtime timestamp, deleted int4, key text)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+# This is to speedup lookup of deleted tuples
+$result = $conn->exec("create index _RSERV_LOG_INDX_DLT_ID_ on _RSERV_LOG_ (deleted, logid)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+# This is to speedup cleanup
+$result = $conn->exec("create index _RSERV_LOG_INDX_TM_ID_ on _RSERV_LOG_ (logtime, logid)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+# This is to speedup trigger and lookup of updated tuples
+$result = $conn->exec("create index _RSERV_LOG_INDX_REL_KEY_ on _RSERV_LOG_ (reloid, key)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+# Sync point for each slave server
+$result = $conn->exec("create table _RSERV_SYNC_" .
+					  " (server int4, syncid int4, synctime timestamp" .
+					  ", status int4, minid int4, maxid int4, active text)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("create index _RSERV_SYNC_INDX_SRV_ID_ on _RSERV_SYNC_ (server, syncid)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+# Sync point reference numbers
+$result = $conn->exec("create sequence _rserv_sync_seq_");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("CREATE FUNCTION _rserv_log_() RETURNS opaque" .
+					  " AS '_OBJWD_/rserv_DLSUFFIX_' LANGUAGE 'c'");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("CREATE FUNCTION _rserv_sync_(int4) RETURNS int4" .
+					  " AS '_OBJWD_/rserv_DLSUFFIX_' LANGUAGE 'c'");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("CREATE FUNCTION _rserv_debug_(int4) RETURNS int4" .
+					  " AS '_OBJWD_/rserv_DLSUFFIX_' LANGUAGE 'c'");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("COMMIT");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+exit (0);
--- a/contrib/rserv/PrepareSnapshot.in
+++ b/contrib/rserv/PrepareSnapshot.in
@ -0,0 +1,56 @@
+# -*- perl -*-
+# PrepareSnapshot
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+    & eval 'exec perl -S $0 $argv:q'
+    if 0;
+
+use lib "@LIBDIR@";
+
+use IO::File;
+use Getopt::Long;
+use RServ;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "help", "snapshot=s",
+		     "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+my $snapshot = $opt_snapshot || "__Snapshot";
+
+if (defined($opt_help) || (scalar(@ARGV) < 1)) {
+    print "Usage: $0 --snapshot=file --host=name --user=name --password=string masterdb\n";
+    exit ((scalar(@ARGV) < 1)? 1:0);
+}
+
+my $master = $ARGV[0] || "master";
+my $server = 0;
+
+my $minfo = "dbname=$master";
+$minfo = "$minfo host=$opt_host" if (defined($opt_host));
+$minfo = "$minfo user=$opt_user" if (defined($opt_user));
+$minfo = "$minfo password=$opt_password" if (defined($opt_password));
+
+my $conn = Pg::connectdb($minfo);
+
+my $outf = new IO::File;
+$outf = STDOUT;
+
+$res = PrepareSnapshot ($conn, $outf, $server);
+
+if ($res == 0)
+{
+	printf STDERR "Sync-ed\n";
+	exit(0);
+}
+if ($res > 0)
+{
+	printf STDERR "Snapshot dumped to STDOUT\n";
+	exit(0);
+}
+
+printf STDERR "ERROR\n";
+exit(1);
--- a/contrib/rserv/README.rserv
+++ b/contrib/rserv/README.rserv
@ -0,0 +1,128 @@
+erServer demonstration implementation
+(c) 2000, Vadim Mikheev and Thomas Lockhart, PostgreSQL Inc.
+
+Version 0.1:
+  Replicates a master database to a single slave database.
+  Tested under Linux (Mandrake 7.2).
+
+Requirements:
+
+- PostgreSQL >= 7.0.X
+  A separate Makefile is required for PostgreSQL 7.0.x and earlier
+- Perl5 and the PostgreSQL perl interface
+- TCL and the PostgreSQL tcl interface (for demo only)
+
+
+How to compile:
+
+- make all
+- make install
+
+Scripts and libraries are installed in places which are consistant
+with the way other contrib/ code is installed; underneath the core
+items in a contrib/ directory.
+
+
+The toolset:
+
+MasterInit dbname
+  sets up structures and user-defined functions for a master
+  database. 
+
+SlaveInit dbname
+  sets up structures for a slave database. Does not include triggers,
+  but only bookkeeping tables. 
+
+MasterAddTable dbname table column
+  sets up triggers for the specified table and column. Note that this
+  column must be updated for replication to occur. 
+
+SlaveAddTable dbname table column
+  sets up bookkeeping for the specified table and column.
+
+Replicate masterdb slavedb
+  actually replicate changes from a master to single slave. Note that
+  this must be repeated to replicate to multiple slaves, but the
+  bookkeeping for each slave is handled separately so each can be
+  updated at different times and with different sets of changes.
+
+GetSyncID [--noverbose] slavedb
+  returns the last syncid the specified slave has seen. May be used
+  in conjunction with CleanLog using the --noverbose option.
+
+CleanLog masterdb syncid
+  removes obsolete entries in the master database replication log
+  table up to the specified replication sequence number.
+
+Other utilities:
+
+PrepareSnapshot
+  build a file of replication information from the specified masterdb.
+
+ApplySnapshot
+  use a file of replication information to apply to the specified
+  slavedb. 
+
+
+How to run a demo:
+
+Run the InitRservTest script. It will create two local databases
+'master' & 'slave' with table 'test' in them. It accepts the following
+arguments:
+  --help
+    Print a usage message and quit.
+  --user name
+    Access the database with another username.
+  --host name
+    Access a remote database. Note that the shared library *must* be
+    visible in the same path as installed on the build machine.
+  masterdb
+  slavedb
+    Names of test databases. Defaults to 'master' and 'slave',
+	respectively.
+
+Once the test databases are set up, simply updating the master table
+is sufficient to log a replication event. You can update the table
+test then run "Replicate master slave", or you can use the demo
+program RservTest.
+
+Run the tcl/tk GUI demo program, RservTest. It has a single window,
+which has four buttons and three data entry boxes.
+
+  --------------------------------------------------
+ |   PostgreSQL Asynchronous Replication            |
+ |        Master          Slave                     |
+ |      < master    >   < slave      >              |
+ |                                                  |
+ |  [ Update    ]   <                         >     |
+ |  [ Replicate ]                                   |
+ |  [ Show      ]   ____________                    |
+ |                                                  |
+ |            [ Quit ]                              |
+ |                                                  |
+  --------------------------------------------------
+
+The demo has the following behaviors:
+
+If you enter a string into the data entry field to the right of
+[Update], then that string will be used to either update the master
+database or to query the slave database.
+
+If you click [Update], then the string in the data entry box will be
+entered into the master database.
+
+If you click [Replicate], then all changes since the last replication
+will be propagated to the slave database.
+
+If you click [Show], then the slave database will be queried to find
+the string in the data entry box to the right of the [Update]
+button. If the string does not (yet) exist in the slave database, then
+"n/a" will appear to the right of the [Show] button. If the string
+does exist in the slave database, then it will be printed to the right
+of the [Show] button.
+
+
+Todo:
+1. Support for multiple slave servers.
+2. Explicit support for master/slave failover.
+3. More docs.
--- a/contrib/rserv/RServ.pm
+++ b/contrib/rserv/RServ.pm
@ -0,0 +1,761 @@
+# -*- perl -*-
+# RServ.pm
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+package RServ;
+
+require Exporter;
+@ISA = qw(Exporter);
+@EXPORT = qw(PrepareSnapshot ApplySnapshot GetSyncID SyncSyncID CleanLog);
+@EXPORT_OK = qw();
+
+use Pg;
+
+$debug = 0;
+$quiet = 1;
+
+my %Mtables = ();
+my %Stables = ();
+
+sub PrepareSnapshot
+{
+	my ($conn, $outf, $server) = @_; # (@_[0], @_[1], @_[2]);
+
+	my $result = $conn->exec("BEGIN");
+	if ($result->resultStatus ne PGRES_COMMAND_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+	$result = $conn->exec("set transaction isolation level serializable");
+	if ($result->resultStatus ne PGRES_COMMAND_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+
+	# MAP oid --> tabname, keyname
+	$result = $conn->exec("select pgc.oid, pgc.relname, pga.attname" . 
+						  " from _RSERV_TABLES_ rt, pg_class pgc, pg_attribute pga" . 
+						  " where pgc.oid = rt.reloid and pga.attrelid = rt.reloid" .
+						  " and pga.attnum = rt.key");
+	if ($result->resultStatus ne PGRES_TUPLES_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+
+	my @row;
+	while (@row = $result->fetchrow)
+	{
+	#	printf "$row[0], $row[1], $row[2]\n";
+		push @{$Mtables{$row[0]}}, $row[1], $row[2];
+	}
+
+	# Read last succeeded sync
+	$sql = "select syncid, synctime, minid, maxid, active from _RSERV_SYNC_" . 
+		" where server = $server and syncid = (select max(syncid) from" . 
+			" _RSERV_SYNC_ where server = $server and status > 0)";
+
+	printf "$sql\n" if $debug;
+
+	$result = $conn->exec($sql);
+	if ($result->resultStatus ne PGRES_TUPLES_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+
+	my @lastsync = $result->fetchrow;
+
+	my $sinfo = "";
+	if ($lastsync[3] ne '')	# sync info
+	{
+		$sinfo = "and (l.logid >= $lastsync[3]";
+		$sinfo .= " or l.logid in ($lastsync[4])" if $lastsync[4] ne '';
+		$sinfo .= ")";
+	}
+
+	my $havedeal = 0;
+
+	# DELETED rows
+	$sql = "select l.reloid, l.key from _RSERV_LOG_ l" .
+		" where l.deleted = 1 $sinfo order by l.reloid";
+
+	printf "$sql\n" if $debug;
+
+	$result = $conn->exec($sql);
+	if ($result->resultStatus ne PGRES_TUPLES_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+
+	$lastoid = '';
+	while (@row = $result->fetchrow)
+	{
+		next unless exists $Mtables{$row[0]};
+		if ($lastoid != $row[0])
+		{
+			if ($lastoid eq '')
+			{
+				my $syncid = GetSYNCID($conn, $outf);
+				return($syncid) if $syncid < 0;
+				$havedeal = 1;
+			}
+			else
+			{
+				printf $outf "\\.\n";
+			}
+			printf $outf "-- DELETE $Mtables{$row[0]}[0]\n";
+			$lastoid = $row[0];
+		}
+		if (! defined $row[1])
+		{
+			print STDERR "NULL key\n" unless ($quiet);
+			$conn->exec("ROLLBACK");
+			return(-2);
+		}
+		printf $outf "%s\n", OutputValue($row[1]);
+	}
+	printf $outf "\\.\n" if $lastoid ne '';
+
+	# UPDATED rows
+
+	my ($taboid, $tabname, $tabkey);
+	foreach $taboid (keys %Mtables)
+	{
+		($tabname, $tabkey) = @{$Mtables{$taboid}};
+		my $oidkey = ($tabkey eq 'oid') ? "_$tabname.oid," : '';
+		$sql = sprintf "select $oidkey _$tabname.* from _RSERV_LOG_ l," .
+			" $tabname _$tabname where l.reloid = $taboid and l.deleted = 0 $sinfo" .
+				" and l.key = _$tabname.${tabkey}::text";
+
+		printf "$sql\n" if $debug;
+
+		$result = $conn->exec($sql);
+		if ($result->resultStatus ne PGRES_TUPLES_OK)
+		{
+			printf $outf "-- ERROR\n" if $havedeal;
+			print STDERR $conn->errorMessage unless ($quiet);
+			$conn->exec("ROLLBACK");
+			return(-1);
+		}
+		next if $result->ntuples <= 0;
+		if (! $havedeal)
+		{
+			my $syncid = GetSYNCID($conn, $outf);
+			return($syncid) if $syncid < 0;
+			$havedeal = 1;
+		}
+		printf $outf "-- UPDATE $tabname\n";
+		while (@row = $result->fetchrow)
+		{
+			for ($i = 0; $i <= $#row; $i++)
+			{
+				printf $outf "	" if $i;
+				printf $outf "%s", OutputValue($row[$i]);
+			}
+			printf $outf "\n";
+		}
+		printf $outf "\\.\n";
+	}
+
+	unless ($havedeal)
+	{
+		$conn->exec("ROLLBACK");
+		return(0);
+	}
+
+	# Remember this snapshot info
+	$result = $conn->exec("select _rserv_sync_($server)");
+	if ($result->resultStatus ne PGRES_TUPLES_OK)
+	{
+		printf $outf "-- ERROR\n";
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+
+	$result = $conn->exec("COMMIT");
+	if ($result->resultStatus ne PGRES_COMMAND_OK)
+	{
+		printf $outf "-- ERROR\n";
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+	printf $outf "-- OK\n";
+
+	return(1);
+
+}
+
+sub OutputValue
+{
+	my ($val) = @_; # @_[0];
+
+	return("\\N") unless defined $val;
+
+	$val =~ s/\\/\\\\/g;
+	$val =~ s/	/\\011/g;
+	$val =~ s/\n/\\012/g;
+	$val =~ s/\'/\\047/g;
+
+	return($val);
+}
+
+# Get syncid for new snapshot
+sub GetSYNCID
+{
+	my ($conn, $outf) = @_; # (@_[0], @_[1]);
+
+	my $result = $conn->exec("select nextval('_rserv_sync_seq_')");
+	if ($result->resultStatus ne PGRES_TUPLES_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+
+	my @row = $result->fetchrow;
+
+	printf $outf "-- SYNCID $row[0]\n";
+	return($row[0]);
+}
+
+
+sub CleanLog
+{
+	my ($conn, $howold) = @_; # (@_[0], @_[1]);
+
+	my $result = $conn->exec("BEGIN");
+	if ($result->resultStatus ne PGRES_COMMAND_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+
+	my $sql = "select rs.maxid, rs.active from _RSERV_SYNC_ rs" .
+		" where rs.syncid = (select max(rs2.syncid) from _RSERV_SYNC_ rs2" .
+			" where rs2.server = rs.server and rs2.status > 0) order by rs.maxid";
+
+	printf "$sql\n" if $debug;
+
+	$result = $conn->exec($sql);
+	if ($result->resultStatus ne PGRES_TUPLES_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		return(-1);
+	}
+	my $maxid = '';
+	my %active = ();
+	while (my @row = $result->fetchrow)
+	{
+		$maxid = $row[0] if $maxid eq '';
+		last if $row[0] > $maxid;
+		my @ids = split(/[ 	]+,[ 	]+/, $row[1]);
+		foreach $aid (@ids)
+		{
+			$active{$aid} = 1 unless exists $active{$aid};
+		}
+	}
+	if ($maxid eq '')
+	{
+		print STDERR "No Sync IDs\n" unless ($quiet);
+		return(0);
+	}
+	my $alist = join(',', keys %active);
+	my $sinfo = "logid < $maxid";
+	$sinfo .= " and logid not in ($alist)" if $alist ne '';
+	
+	$sql = "delete from _RSERV_LOG_ where " . 
+		"logtime < now() - '$howold second'::interval and $sinfo";
+
+	printf "$sql\n" if $debug;
+
+	$result = $conn->exec($sql);
+	if ($result->resultStatus ne PGRES_COMMAND_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+	$maxid = $result->cmdTuples;
+
+	$result = $conn->exec("COMMIT");
+	if ($result->resultStatus ne PGRES_COMMAND_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+
+	return($maxid);
+}
+
+sub ApplySnapshot
+{
+	my ($conn, $inpf) = @_; # (@_[0], @_[1]);
+
+	my $result = $conn->exec("BEGIN");
+	if ($result->resultStatus ne PGRES_COMMAND_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+
+	$result = $conn->exec("SET CONSTRAINTS ALL DEFERRED");
+	if ($result->resultStatus ne PGRES_COMMAND_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+
+	# MAP name --> oid, keyname, keynum
+	my $sql = "select pgc.oid, pgc.relname, pga.attname, rt.key" . 
+		" from _RSERV_SLAVE_TABLES_ rt, pg_class pgc, pg_attribute pga" . 
+			" where pgc.oid = rt.reloid and pga.attrelid = rt.reloid" .
+				" and pga.attnum = rt.key";
+	$result = $conn->exec($sql);
+	if ($result->resultStatus ne PGRES_TUPLES_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+
+	while (@row = $result->fetchrow)
+	{
+	#	printf "	%s	%s\n", $row[1], $row[0];
+		push @{$Stables{$row[1]}}, $row[0], $row[2], $row[3];
+	}
+
+	my $ok = 0;
+	my $syncid = '';
+	while(<$inpf>)
+	{
+		$_ =~ s/\n//;
+		my ($cmt, $cmd, $prm) = split (/[ 	]+/, $_, 3);
+		if ($cmt ne '--')
+		{
+			printf STDERR "Invalid format\n" unless ($quiet);
+			$conn->exec("ROLLBACK");
+			return(-2);
+		}
+		if ($cmd eq 'DELETE')
+		{
+			if ($syncid eq '')
+			{
+				printf STDERR "Sync ID unspecified\n" unless ($quiet);
+				$conn->exec("ROLLBACK");
+				return(-2);
+			}
+			$result = DoDelete($conn, $inpf, $prm);
+			if ($result)
+			{
+				$conn->exec("ROLLBACK");
+				return($result);
+			}
+		}
+		elsif ($cmd eq 'UPDATE')
+		{
+			if ($syncid eq '')
+			{
+				printf STDERR "Sync ID unspecified\n" unless ($quiet);
+				$conn->exec("ROLLBACK");
+				return(-2);
+			}
+			$result = DoUpdate($conn, $inpf, $prm);
+			if ($result)
+			{
+				$conn->exec("ROLLBACK");
+				return($result);
+			}
+		}
+		elsif ($cmd eq 'SYNCID')
+		{
+			if ($syncid ne '')
+			{
+				printf STDERR "Second Sync ID ?!\n" unless ($quiet);
+				$conn->exec("ROLLBACK");
+				return(-2);
+			}
+			if ($prm !~ /^\d+$/)
+			{
+				printf STDERR "Invalid Sync ID $prm\n" unless ($quiet);
+				$conn->exec("ROLLBACK");
+				return(-2);
+			}
+			$syncid = $prm;
+
+			printf STDERR "Sync ID $syncid\n" unless ($quiet);
+
+			$result = $conn->exec("select syncid, synctime from " . 
+								  "_RSERV_SLAVE_SYNC_ where syncid = " . 
+								  "(select max(syncid) from _RSERV_SLAVE_SYNC_)");
+			if ($result->resultStatus ne PGRES_TUPLES_OK)
+			{
+				print STDERR $conn->errorMessage unless ($quiet);
+				$conn->exec("ROLLBACK");
+				return(-1);
+			}
+			my @row = $result->fetchrow;
+			if (! defined $row[0])
+			{
+				$result = $conn->exec("insert into" .
+									  " _RSERV_SLAVE_SYNC_(syncid, synctime) values ($syncid, now())");
+			}
+			elsif ($row[0] >= $prm)
+			{
+				printf STDERR "Sync-ed to ID $row[0] ($row[1])\n" unless ($quiet);
+				$conn->exec("ROLLBACK");
+				return(0);
+			}
+			else
+			{
+				$result = $conn->exec("update _RSERV_SLAVE_SYNC_" .
+									  " set syncid = $syncid, synctime = now()");
+			}
+			if ($result->resultStatus ne PGRES_COMMAND_OK)
+			{
+				print STDERR $conn->errorMessage unless ($quiet);
+				$conn->exec("ROLLBACK");
+				return(-1);
+			}
+		}
+		elsif ($cmd eq 'OK')
+		{
+			$ok = 1;
+			last;
+		}
+		elsif ($cmd eq 'ERROR')
+		{
+			printf STDERR "ERROR signaled\n" unless ($quiet);
+			$conn->exec("ROLLBACK");
+			return(-2);
+		}
+		else
+		{
+			printf STDERR "Unknown command $cmd\n" unless ($quiet);
+			$conn->exec("ROLLBACK");
+			return(-2);
+		}
+	}
+
+	if (! $ok)
+	{
+		printf STDERR "No OK flag in input\n" unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-2);
+	}
+
+	$result = $conn->exec("COMMIT");
+	if ($result->resultStatus ne PGRES_COMMAND_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+
+	return(1);
+}
+
+sub DoDelete
+{
+	my ($conn, $inpf, $tabname) = @_; # (@_[0], @_[1], @_[2]);
+
+	my $ok = 0;
+	while(<$inpf>)
+	{
+		if ($_ !~ /\n$/)
+		{
+			printf STDERR "Invalid format\n" unless ($quiet);
+			return(-2);
+		}
+		my $key = $_;
+		$key =~ s/\n//;
+		if ($key eq '\.')
+		{
+			$ok = 1;
+			last;
+		}
+
+		my $sql = "delete from $tabname where $Stables{$tabname}->[1] = '$key'";
+
+		printf "$sql\n" if $debug;
+
+		my $result = $conn->exec($sql);
+		if ($result->resultStatus ne PGRES_COMMAND_OK)
+		{
+			print STDERR $conn->errorMessage unless ($quiet);
+			return(-1);
+		}
+	}
+
+	if (! $ok)
+	{
+		printf STDERR "No end of input in DELETE section\n" unless ($quiet);
+		return(-2);
+	}
+
+	return(0);
+}
+
+
+sub DoUpdate
+{
+	my ($conn, $inpf, $tabname) = @_; # (@_[0], @_[1], @_[2]);
+	my $oidkey = ($Stables{$tabname}->[2] < 0) ? 1 : 0;
+
+	my @CopyBuf = ();
+	my $CBufLen = 0;
+	my $CBufMax = 16 * 1024 * 1024;	# max size of buf for copy
+
+	my $sql = "select attnum, attname from pg_attribute" .
+		" where attrelid = $Stables{$tabname}->[0] and attnum > 0";
+
+	my $result = $conn->exec($sql);
+	if ($result->resultStatus ne PGRES_TUPLES_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		return(-1);
+	}
+
+	my @anames = ();
+	while (@row = $result->fetchrow)
+	{
+		$anames[$row[0]] = $row[1];
+	}
+
+	my $istring;
+	my $ok = 0;
+	while(<$inpf>)
+	{
+		if ($_ !~ /\n$/)
+		{
+			printf STDERR "Invalid format\n" unless ($quiet);
+			return(-2);
+		}
+		$istring = $_;
+		$istring =~ s/\n//;
+		if ($istring eq '\.')
+		{
+			$ok = 1;
+			last;
+		}
+		my @vals = split(/	/, $istring);
+		if ($oidkey)
+		{
+			if ($vals[0] !~ /^\d+$/ || $vals[0] <= 0)
+			{
+				printf STDERR "Invalid OID\n" unless ($quiet);
+				return(-2);
+			}
+			$oidkey = $vals[0];
+		}
+		else
+		{
+			unshift @vals, '';
+		}
+
+		$sql = "update $tabname set ";
+		my $ocnt = 0;
+		for (my $i = 1; $i <= $#anames; $i++)
+		{
+			if ($vals[$i] eq '\N')
+			{
+				if ($i == $Stables{$tabname}->[2])
+				{
+					printf STDERR "NULL key\n" unless ($quiet);
+					return(-2);
+				}
+				$vals[$i] = 'null';
+			}
+			else
+			{
+				$vals[$i] = "'" . $vals[$i] . "'";
+				next if $i == $Stables{$tabname}->[2];
+			}
+			$ocnt++;
+			$sql .= ', ' if $ocnt > 1;
+			$sql .= "$anames[$i] = $vals[$i]";
+		}
+		if ($oidkey)
+		{
+			$sql .= " where $Stables{$tabname}->[1] = $oidkey";
+		}
+		else
+		{
+			$sql .= " where $Stables{$tabname}->[1] = $vals[$Stables{$tabname}->[2]]";
+		}
+
+		printf "$sql\n" if $debug;
+
+		$result = $conn->exec($sql);
+		if ($result->resultStatus ne PGRES_COMMAND_OK)
+		{
+			print STDERR $conn->errorMessage unless ($quiet);
+			return(-1);
+		}
+		next if $result->cmdTuples == 1;	# updated
+
+		if ($result->cmdTuples > 1)
+		{
+			printf STDERR "Duplicate keys\n" unless ($quiet);
+			return(-2);
+		}
+
+		# no key - copy
+		push @CopyBuf, "$istring\n";
+		$CBufLen += length($istring);
+
+		if ($CBufLen >= $CBufMax)
+		{
+			$result = DoCopy($conn, $tabname, $oidkey, \@CopyBuf);
+			return($result) if $result;
+			@CopyBuf = ();
+			$CBufLen = 0;
+		}
+	}
+
+	if (! $ok)
+	{
+		printf STDERR "No end of input in UPDATE section\n" unless ($quiet);
+		return(-2);
+	}
+
+	if ($CBufLen)
+	{
+		$result = DoCopy($conn, $tabname, $oidkey, \@CopyBuf);
+		return($result) if $result;
+	}
+
+	return(0);
+}
+
+
+sub DoCopy
+{
+	my ($conn, $tabname, $withoids, $CBuf) = @_; # (@_[0], @_[1], @_[2], @_[3]);
+
+	my $sql = "COPY $tabname " . (($withoids) ? "WITH OIDS " : '') . 
+"FROM STDIN";
+	my $result = $conn->exec($sql);
+	if ($result->resultStatus ne PGRES_COPY_IN)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		return(-1);
+	}
+
+	foreach $str (@{$CBuf})
+	{
+		$conn->putline($str);
+	}
+
+	$conn->putline("\\.\n");
+
+	if ($conn->endcopy)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		return(-1);
+	}
+
+	return(0);
+
+}
+
+
+#
+# Returns last SyncID applied on Slave
+#
+sub GetSyncID
+{
+	my ($conn) = @_; # (@_[0]);
+	
+	my $result = $conn->exec("select max(syncid) from _RSERV_SLAVE_SYNC_");
+	if ($result->resultStatus ne PGRES_TUPLES_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		return(-1);
+	}
+	my @row = $result->fetchrow;
+	return(undef) unless defined $row[0];	# null
+	return($row[0]);
+}
+
+#
+# Updates _RSERV_SYNC_ on Master with Slave SyncID
+#
+sub SyncSyncID
+{
+	my ($conn, $server, $syncid) = @_; # (@_[0], @_[1], @_[2]);
+	
+	my $result = $conn->exec("BEGIN");
+	if ($result->resultStatus ne PGRES_COMMAND_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+
+	$result = $conn->exec("select synctime, status from _RSERV_SYNC_" .
+						  " where server = $server and syncid = $syncid" .
+						  " for update");
+	if ($result->resultStatus ne PGRES_TUPLES_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+	my @row = $result->fetchrow;
+	if (! defined $row[0])
+	{
+		printf STDERR "No SyncID $syncid found for server $server\n" unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(0);
+	}
+	if ($row[1] > 0)
+	{
+		printf STDERR "SyncID $syncid for server $server already updated\n" unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(0);
+	}
+	$result = $conn->exec("update _RSERV_SYNC_" .
+						  " set synctime = now(), status = 1" .
+						  " where server = $server and syncid = $syncid");
+	if ($result->resultStatus ne PGRES_COMMAND_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+	$result = $conn->exec("delete from _RSERV_SYNC_" .
+						  " where server = $server and syncid < $syncid");
+	if ($result->resultStatus ne PGRES_COMMAND_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+
+	$result = $conn->exec("COMMIT");
+	if ($result->resultStatus ne PGRES_COMMAND_OK)
+	{
+		print STDERR $conn->errorMessage unless ($quiet);
+		$conn->exec("ROLLBACK");
+		return(-1);
+	}
+
+	return(1);
+}
+
+1;
--- a/contrib/rserv/Replicate.in
+++ b/contrib/rserv/Replicate.in
@ -0,0 +1,100 @@
+# -*- perl -*-
+# Replicate
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+    & eval 'exec perl -S $0 $argv:q'
+    if 0;
+
+use lib "@LIBDIR@";
+
+use IO::File;
+use Getopt::Long;
+use RServ;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "help", "snapshot=s",
+		     "masterhost=s", "slavehost=s", "host=s",
+		     "masteruser=s", "slaveuser=s", "user=s",
+		     "masterpassword=s", "slavepassword=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+my $snapshot = $opt_snapshot || "__Snapshot";
+
+if (defined($opt_help) || (scalar(@ARGV) < 2)) {
+    print "Usage: $0 --snapshot=file --host=name --user=name --password=string masterdb slavedb\n";
+    print "\t--masterhost=name --masteruser=name --masterpassword=string\n";
+    print "\t--slavehost=name --slaveuser=name --slavepassword=string\n";
+    exit ((scalar(@ARGV) < 2)? 1:0);
+}
+
+my $master = $ARGV[0] || "master";
+my $slave = $ARGV[1] || "slave";
+my $server = 0;
+
+my $minfo = "dbname=$master";
+$minfo = "$minfo host=$opt_masterhost" if (defined($opt_masterhost));
+$minfo = "$minfo user=$opt_masteruser" if (defined($opt_masteruser));
+$minfo = "$minfo password=$opt_masterpassword" if (defined($opt_masterpassword));
+my $sinfo = "dbname=$slave";
+$sinfo = "$sinfo host=$opt_slavehost" if (defined($opt_slavehost));
+$sinfo = "$sinfo user=$opt_slaveuser" if (defined($opt_slaveuser));
+$sinfo = "$sinfo password=$opt_slavepassword" if (defined($opt_slavepassword));
+
+print "Master connection is $minfo\n" if ($debug);
+print "Slave connection is $sinfo\n" if ($debug);
+
+my $mconn = Pg::connectdb($minfo);
+my $sconn = Pg::connectdb($sinfo);
+
+SyncSync($mconn, $sconn);
+
+my $outf = new IO::File;
+open $outf, ">$snapshot";
+print "\n>>>>>>>>>>>>> Prepare Snapshot\n\n" if ($verbose);
+$res = PrepareSnapshot($mconn, $outf, $server);
+close $outf;
+die "\n>>>>>>>>>>>>> ERROR\n" if $res < 0;
+if ($res == 0)
+{
+	print "\n>>>>>>>>>>>>> DBases are sync-ed\n" if ($verbose);
+	exit(0);
+}
+
+my $inpf = new IO::File;
+open $inpf, "<$snapshot";
+print "\n>>>>>>>>>>>>> Apply Snapshot\n\n" if ($verbose);
+$res = ApplySnapshot($sconn, $inpf);
+close $inpf;
+die "\n>>>>>>>>>>>>> ERROR\n" if $res < 0;
+
+if ($res > 0)
+{
+	print "Snapshot applied\n" if ($verbose);
+	unlink $snapshot unless ($debug);
+	SyncSync($mconn, $sconn);
+}
+
+exit(0);
+
+###########################################################################
+
+sub SyncSync
+{
+    ($mconn, $sconn) = @_;
+
+    print "\n>>>>>>>>>>>>> Sync SyncID\n\n" if ($verbose);
+    print "Get last SyncID from Slave DB\n" if ($verbose);
+    $syncid = GetSyncID($sconn);
+    if ($syncid > 0)
+    {
+	print "Last SyncID applied: $syncid\n" if ($verbose);
+	print "Sync SyncID\n" if ($verbose);
+
+	$res = SyncSyncID($mconn, $server, $syncid);
+
+	print "Succeeded\n" if (($res > 0) && ($verbose));
+    }
+}
--- a/contrib/rserv/RservTest.in
+++ b/contrib/rserv/RservTest.in
@ -0,0 +1,313 @@
+#!/bin/sh
+# pgserv.tcl
+# (c) 2000 Thomas Lockhart, PostgreSQL Inc.
+# The next line will reinvoke as wish *DO NOT REMOVE OR ALTER* \
+exec wish "$0" "$@"
+
+puts "Starting Replication Server demo"
+
+set RSERV_BIN "@BINDIR@"
+
+# Bring in the interfaces we will be using...
+
+#package require Pgtcl
+load libpgtcl[info sharedlibextension]
+
+# elog
+# Information or error log and exit handler
+proc {elog} {level message} {
+    global show
+    switch -exact -- $level {
+        DEBUG {
+            if {$show(debug)} {
+                puts "DEBUG $message"
+            }
+        }
+        ERROR {
+            if {$show(error)} {
+                puts "ERROR $message"
+            }
+        FATAL {
+            if ($show(error)} {
+                puts "FATAL $message"
+            }
+            exit 1
+        }
+        default {
+            puts "INFO $message"
+        }
+    }
+}
+
+proc {ShowUsage} {} {
+    global argv0
+    puts "Usage: $argv0 --host name --user name --password string masterdb slavedb"
+    puts "\t--masterhost name --masteruser name --masterpassword string"
+    puts "\t--slavehost name --slaveuser name --slavepassword string"
+}
+
+# Initial values for database access
+# master, slave variables are tied to text input boxes,
+# and will be updated on user input
+proc {SetDbInfo} {db name {host ""} {user ""} {pass ""}} {
+    global dbinfo
+    set dbinfo($db,name) $name
+    set dbinfo($db,host) $host
+    set dbinfo($db,user) $user
+    set dbinfo($db,pass) $pass
+}
+
+# ConnInfo
+# Connection information for pgtcl library
+proc {ConnInfo} {{db master}} {
+    global dbinfo
+    set ci "dbname=$dbinfo($db,name)"
+    if {[string length $dbinfo($db,host)] > 0} {
+        set ci "$ci host=$dbinfo($db,host)"
+    }
+    if {[string length $dbinfo($db,user)] > 0} {
+        set ci "$ci user=$dbinfo($db,user)"
+    }
+    if {[string length $dbinfo($db,pass)] > 0} {
+        set ci "$ci password=$dbinfo($db,pass)"
+    }
+#    puts "Construct conninfo $ci"
+    return $ci
+}
+
+# ConnInfoParams
+# Connection information for (perl) callable programs
+proc {ConnInfoParams} {{db master}} {
+    global dbinfo
+    set ci ""
+    if {[string length $dbinfo($db,host)] > 0} {
+        set ci "$ci --host=$dbinfo($db,host)"
+    }
+    if {[string length $dbinfo($db,user)] > 0} {
+        set ci "$ci --user=$dbinfo($db,user)"
+    }
+    if {[string length $dbinfo($db,pass)] > 0} {
+        set ci "$ci --password=$dbinfo($db,pass)"
+    }
+#    puts "Construct conninfo $ci"
+    return $ci
+}
+
+# ConnInfoMaster
+# Connection information for (perl) callable programs
+proc {ConnInfoMaster} {{db master}} {
+    global dbinfo
+    set ci $dbinfo($db,name)
+    if {[string length $dbinfo($db,host)] > 0} {
+        set ci "$ci --masterhost=$dbinfo($db,host)"
+    }
+    if {[string length $dbinfo($db,user)] > 0} {
+        set ci "$ci --masteruser=$dbinfo($db,user)"
+    }
+    if {[string length $dbinfo($db,pass)] > 0} {
+        set ci "$ci --masterpassword=$dbinfo($db,pass)"
+    }
+#    puts "Construct conninfo $ci"
+    return $ci
+}
+
+# ConnInfoSlave
+# Connection information for (perl) callable programs
+proc {ConnInfoSlave} {{db slave}} {
+    global dbinfo
+    set ci $dbinfo($db,name)
+    if {[string length $dbinfo($db,host)] > 0} {
+        set ci "$ci --slavehost=$dbinfo($db,host)"
+    }
+    if {[string length $dbinfo($db,user)] > 0} {
+        set ci "$ci --slaveuser=$dbinfo($db,user)"
+    }
+    if {[string length $dbinfo($db,pass)] > 0} {
+        set ci "$ci --slavepassword=$dbinfo($db,pass)"
+    }
+#    puts "Construct conninfo $ci"
+    return $ci
+}
+
+
+SetDbInfo master master localhost
+SetDbInfo slave slave localhost
+set dbinfo(snapshot,name) "__Snapshot"
+
+set update ""
+
+set show(debug) 1
+set show(error) 1
+
+set argi 0
+while {$argi < $argc} {
+#    puts "argi is $argi; argc is $argc"
+    set arg [lindex $argv $argi]
+    switch -glob -- $arg {
+        -h -
+        --host {
+            incr argi
+            set dbinfo(master,host) [lindex $argv $argi]
+            set dbinfo(slave,host) [lindex $argv $argi]
+        }
+        --masterhost {
+            incr argi
+            set dbinfo(master,host) [lindex $argv $argi]
+        }
+        --slavehost {
+            incr argi
+            set dbinfo(slave,host) [lindex $argv $argi]
+        }
+        -u -
+        --user {
+            incr argi
+            set dbinfo(master,user) [lindex $argv $argi]
+            set dbinfo(slave,user) [lindex $argv $argi]
+        }
+        --masteruser {
+            incr argi
+            set dbinfo(master,user) [lindex $argv $argi]
+        }
+        --slaveuser {
+            incr argi
+            set dbinfo(slave,user) [lindex $argv $argi]
+        }
+        -s -
+        --snapshot {
+            incr argi
+            set dbinfo(snapshot,name) [lindex $argv $argi]
+        }
+        -* {
+            elog ERROR "$argv0: invalid parameter '$arg'"
+            ShowUsage
+            exit 1
+        }
+        default {
+            break
+        }
+    }
+    incr argi
+}
+
+if {$argi < $argc} {
+    set dbinfo(master,name) [lindex $argv $argi]
+    incr argi
+}
+if {$argi < $argc} {
+    set dbinfo(slave,name) [lindex $argv $argi]
+    incr argi
+}
+if {$argi < $argc} {
+    elog "$argv0: too many parameters"
+    ShowUsage
+    exit 1
+}
+
+elog DEBUG "User is $dbinfo(master,user) $dbinfo(slave,user)"
+elog DEBUG "Host is $dbinfo(master,host) $dbinfo(slave,host)"
+
+#
+# TK layout
+#
+
+wm title . "Async Replication"
+
+wm geom . 400x400
+
+proc {CreateResultFrame} {b l w} {
+    pack [frame $b -borderwidth 10] -fill x
+    pack [button $b.run -text $l -command $l -width $w] -side left
+#    pack [entry $b.e -textvariable NewRow] -side left
+}
+
+set t .top
+pack [frame $t -borderwidth 10] -fill x
+pack [frame $t.h -borderwidth 10] -fill x
+pack [label $t.h.h -text "PostgreSQL Async Replication Server"]
+
+set b .b
+pack [frame $b -borderwidth 10] -fill x
+pack [frame $b.l -borderwidth 10] -fill x
+pack [label $b.l.ml -text "Master"] -side left
+pack [label $b.l.sl -text "Slave"] -side right
+pack [entry $b.m -textvariable dbinfo(master,name) -width 25] -side left
+pack [entry $b.s -textvariable dbinfo(slave,name) -width 25] -side right
+
+set b .u
+pack [frame $b -borderwidth 10] -fill x
+pack [button $b.run -text update -command Update -width 10] -side left
+pack [entry $b.e -textvariable update -width 50] -side left
+
+set r [CreateResultFrame .r Replicate 10]
+
+set b .s
+pack [frame $b -borderwidth 10] -fill x
+pack [button $b.b -text Show -command Show -width 10] -side left
+pack [label $b.e -text ""] -side left
+
+set b .button
+pack [frame $b -borderwidth 10] -fill x
+
+pack [button $b.quit -text "Quit" -command Shutdown]
+
+#
+# Functions mapped to buttons
+#
+
+proc {Update} {} {
+    global dbinfo
+    global update
+
+    elog DEBUG "Opening database [ConnInfo master]..."
+    set res [catch {set db [pg_connect -conninfo "[ConnInfo master]"]} msg]
+    if {$res} {
+        elog ERROR "Database '$dbinfo(master,name)' is not available: $res ($msg)"
+    } else {
+        elog DEBUG "Insert $update into database $dbinfo(master,name)..."
+        set res [pg_exec $db "insert into test select '$update', max(k)+1, max(l)+1 from test"]
+        elog DEBUG [pg_result $res -status]
+        catch {pg_disconnect $db}
+    }
+}
+
+proc {Replicate} {} {
+    global dbinfo
+    global RSERV_BIN
+
+    elog DEBUG "Replicating [ConnInfoCmd master]..."
+    exec "$RSERV_BIN/Replicate" --snapshot=$dbinfo(snapshot,name) [ConnInfoParams] [ConnInfoMaster] [ConnInfoSlave]
+}
+
+proc {Show} {} {
+    global dbinfo
+    global update
+
+    elog DEBUG "Opening database [ConnInfo slave]..."
+    set res [catch {set db [pg_connect -conninfo "[ConnInfo slave]"]} msg]
+    if {$res} {
+        elog ERROR "DB $dbinfo(slave,name) not available: $res ($msg)"
+    } else {
+        elog DEBUG "Select $update from database $dbinfo(slave,name)..."
+       set res [pg_exec $db "select i from test where i='$update'"]
+        if {[pg_result $res -status] != "PGRES_TUPLES_OK"} {
+            .s.e config -text "n/a"
+        } else {
+            set ntups [pg_result $res -numTuples]
+            if {$ntups <= 0} {
+                .s.e config -text "n/a"
+            } else {
+                for {set i 0} {$i < $ntups} {incr i} {
+                    set val [pg_result $res -getTuple $i]
+                    .s.e config -text $val
+                }
+            }
+            pg_result $res -clear
+        }
+        catch {pg_disconnect $db}
+    }
+}
+
+proc {Shutdown} {} {
+    global dbinfo
+    exit
+}
--- a/contrib/rserv/SlaveAddTable.in
+++ b/contrib/rserv/SlaveAddTable.in
@ -0,0 +1,59 @@
+# -*- perl -*-
+# SlaveAddTable
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+    & eval 'exec perl -S $0 $argv:q'
+    if 0;
+
+use Pg;
+use Getopt::Long;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "help",
+		     "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+
+if (defined($opt_help) || (scalar(@ARGV) < 3)) {
+    print "Usage: $0 --host=name --user=name --password=string slavedb table column\n";
+    exit ((scalar(@ARGV) < 3)? 1: 0);
+}
+
+my $dbname = $ARGV[0];
+my $table = $ARGV[1];
+my $keyname = $ARGV[2];
+
+my $sinfo = "dbname=$dbname";
+$sinfo = "$sinfo host=$opt_host" if (defined($opt_host));
+$sinfo = "$sinfo user=$opt_user" if (defined($opt_user));
+$sinfo = "$sinfo password=$opt_password" if (defined($opt_password));
+
+my $dbname = $ARGV[0];
+my $table = $ARGV[1];
+my $keyname = $ARGV[2];
+
+my $conn = Pg::connectdb($sinfo);
+
+my $result = $conn->exec("BEGIN");
+die $conn->errorMessage if $result->resultStatus ne PGRES_COMMAND_OK;
+
+$result = $conn->exec("select pgc.oid, pga.attnum from pg_class pgc" . 
+					  ", pg_attribute pga" .
+					  " where pgc.relname = '$table' and pgc.oid = pga.attrelid" . 
+					  " and pga.attname = '$keyname'");
+die $conn->errorMessage if $result->resultStatus ne PGRES_TUPLES_OK;
+
+my @row = $result->fetchrow;
+die "Can't find table/key\n" if ! defined $row[0] || ! defined $row[1];
+
+$result = $conn->exec("insert into _RSERV_SLAVE_TABLES_ (tname, cname, reloid, key)" . 
+					  " values ('$table', '$keyname', $row[0], $row[1])");
+die $conn->errorMessage if $result->resultStatus ne PGRES_COMMAND_OK;
+
+$result = $conn->exec("COMMIT");
+die $conn->errorMessage if $result->resultStatus ne PGRES_COMMAND_OK;
+
+exit(0);
--- a/contrib/rserv/SlaveInit.in
+++ b/contrib/rserv/SlaveInit.in
@ -0,0 +1,65 @@
+# -*- perl -*-
+# SlaveInit
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+    & eval 'exec perl -S $0 $argv:q'
+    if 0;
+
+use Pg;
+use Getopt::Long;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "quiet!", "help",
+		     "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+my $quiet = $opt_quiet || 0;
+
+if (defined($opt_help) || (scalar(@ARGV) < 1)) {
+    print "Usage: $0 --host=name --user=name --password=string slavedb\n";
+    exit ((scalar(@ARGV) < 1)? 1:0);
+}
+
+my $slave = $ARGV[0] || "slave";
+
+my $sinfo = "dbname=$slave";
+$sinfo = "$sinfo host=$opt_host" if (defined($opt_host));
+$sinfo = "$sinfo user=$opt_user" if (defined($opt_user));
+$sinfo = "$sinfo password=$opt_password" if (defined($opt_password));
+
+sub RollbackAndQuit {
+    my $conn = shift @_;
+
+    print STDERR $conn->errorMessage;
+    $conn->exec("ROLLBACK");
+    exit (-1);
+}
+
+print "Connecting to $sinfo\n";
+my $conn = Pg::connectdb($sinfo);
+if ($conn->status != PGRES_CONNECTION_OK) {
+    print STDERR "Failed opening $sinfo\n";
+    exit 1;
+}
+
+my $result = $conn->exec("BEGIN");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("set transaction isolation level serializable");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("create table _RSERV_SLAVE_TABLES_" .
+		      " (tname name, cname name, reloid oid, key int4)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("create table _RSERV_SLAVE_SYNC_" .
+		      " (syncid int4, synctime timestamp)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("COMMIT");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+exit (0);
--- a/contrib/rserv/SyncSyncID.in
+++ b/contrib/rserv/SyncSyncID.in
@ -0,0 +1,48 @@
+# -*- perl -*-
+# SyncSyncID
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+    & eval 'exec perl -S $0 $argv:q'
+    if 0;
+
+use lib "@LIBDIR@";
+
+use Getopt::Long;
+use RServ;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "quiet!", "help",
+		     "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+my $quiet = $opt_quiet || 0;
+
+if (defined($opt_help) || (scalar(@ARGV) < 2) || ($ARGV[1] !~ /^\d+$/)) {
+    print "Usage: $0 --host=name --user=name --password=string masterdb syncid\n";
+    exit ((scalar(@ARGV) < 2)? 1:0);
+}
+
+my $master = $ARGV[0] || "master";
+my $server = 0;
+my $syncid = $ARGV[1] || die "SyncID not specified";
+
+my $minfo = "dbname=$master";
+$minfo = "$minfo host=$opt_host" if (defined($opt_host));
+$minfo = "$minfo user=$opt_user" if (defined($opt_user));
+$minfo = "$minfo password=$opt_password" if (defined($opt_password));
+
+my $conn = Pg::connectdb($minfo);
+
+$res = SyncSyncID($conn, $server, $syncid);
+
+if ($res == 0)
+{
+    printf STDERR "SyncID updated on $master\n" if ($verbose);
+    exit(0);
+}
+
+printf STDERR "ERROR\n" unless ($quiet);
+exit(1);
--- a/contrib/rserv/master.sql.in
+++ b/contrib/rserv/master.sql.in
@ -0,0 +1,101 @@
+-- erServer
+-- Master server setup for erServer demonstration implementation
+-- (c) 2000 Vadim Mikheev, PostgreSQL Inc.
+--
+
+--
+-- Slave servers
+--
+drop table _RSERV_SERVERS_;
+
+create table _RSERV_SERVERS_
+(
+	server	int4,	-- slave server id
+	host	text,	-- server' host
+	port	int4,	-- server' port
+	dbase	text	-- db name
+);
+
+
+--
+-- Tables to sync
+--
+drop table _RSERV_TABLES_;
+
+create table _RSERV_TABLES_
+(
+	tname  name,	-- table name
+	cname  name,	-- column name
+	reloid	oid,	-- table oid
+	key		int4	-- key attnum 
+);
+
+
+--
+-- Log for inserts/updates/deletes to sync-ed tables
+--
+drop table _RSERV_LOG_;
+
+create table _RSERV_LOG_
+(
+	reloid		oid,
+	logid		int4,		-- xid of last update xaction
+	logtime		timestamp,	-- last update xaction start time
+	deleted		int4,		-- deleted or inserted/updated
+	key			text		-- 
+);
+
+-- This is to speedup lookup deleted tuples
+create index _RSERV_LOG_INDX_DLT_ID_ on _RSERV_LOG_ (deleted, logid);
+
+-- This is to speedup cleanup
+create index _RSERV_LOG_INDX_TM_ID_ on _RSERV_LOG_ (logtime, logid);
+
+-- This is to speedup trigger and lookup updated tuples
+create index _RSERV_LOG_INDX_REL_KEY_ on _RSERV_LOG_ (reloid, key);
+
+
+--
+-- How much each slave servers are sync-ed
+--
+drop table _RSERV_SYNC_;
+
+create table _RSERV_SYNC_
+(
+	server		int4,
+	syncid		int4,		-- from _rserv_sync_seq_
+	synctime	timestamp,	-- 
+	status		int4,		-- prepared (0) | applied
+	minid		int4,		-- min xid from serializable snapshot
+	maxid		int4,		-- max xid from serializable snapshot
+	active		text		-- list of active xactions
+);
+
+create index _RSERV_SYNC_INDX_SRV_ID_ on _RSERV_SYNC_ (server, syncid);
+
+drop sequence _rserv_sync_seq_;
+create sequence _rserv_sync_seq_;
+
+drop function _rserv_log_();
+
+CREATE FUNCTION _rserv_log_()
+	RETURNS opaque
+	AS '_OBJWD_/rserv_DLSUFFIX_'
+	LANGUAGE 'c'
+;
+
+drop function _rserv_sync_(int4);
+
+CREATE FUNCTION _rserv_sync_(int4)
+	RETURNS int4
+	AS '_OBJWD_/rserv_DLSUFFIX_'
+	LANGUAGE 'c'
+;
+
+drop function _rserv_debug_(int4);
+
+CREATE FUNCTION _rserv_debug_(int4)
+	RETURNS int4
+	AS '_OBJWD_/rserv_DLSUFFIX_'
+	LANGUAGE 'c'
+;
--- a/contrib/rserv/regress.sh
+++ b/contrib/rserv/regress.sh
@ -0,0 +1,32 @@
+# regress.sh
+# rserv regression test script
+# (c) 2000 Thomas Lockhart, PostgreSQL Inc.
+
+dropdb master
+dropdb slave
+
+createdb master
+createdb slave
+
+MasterInit master
+SlaveInit slave
+
+psql -c "create table t1 (i int, t text, d timestamp default text 'now');" master
+MasterAddTable master t1 d
+
+psql -c "create table t1 (i int, t text, d timestamp default text 'now');" slave
+SlaveAddTable slave t1 d
+
+psql -c "insert into t1 values (1, 'one');" master
+psql -c "insert into t1 values (2, 'two');" master
+
+Replicate master slave
+SyncSyncID master `GetSyncID --noverbose slave`
+
+psql -c "insert into t1 values (3, 'three');" master
+psql -c "insert into t1 values (4, 'four');" master
+
+Replicate master slave
+SyncSyncID master `GetSyncID --noverbose slave`
+
+exit
--- a/contrib/rserv/rserv.c
+++ b/contrib/rserv/rserv.c
@ -0,0 +1,319 @@
+/* rserv.c
+ * Support functions for erServer replication.
+ * (c) 2000 Vadim Mikheev, PostgreSQL Inc.
+ */
+
+#include "executor/spi.h"		/* this is what you need to work with SPI */
+#include "commands/trigger.h"	/* -"- and triggers */
+#include "utils/tqual.h"		/* -"- and SnapshotData */
+#include <ctype.h>				/* tolower () */
+
+#ifdef PG_FUNCTION_INFO_V1
+#define CurrentTriggerData ((TriggerData *) fcinfo->context)
+#endif
+
+#ifdef PG_FUNCTION_INFO_V1
+PG_FUNCTION_INFO_V1(_rserv_log_);
+PG_FUNCTION_INFO_V1(_rserv_sync_);
+PG_FUNCTION_INFO_V1(_rserv_debug_);
+Datum _rserv_log_(PG_FUNCTION_ARGS);
+Datum _rserv_sync_(PG_FUNCTION_ARGS);
+Datum _rserv_debug_(PG_FUNCTION_ARGS);
+#else
+HeapTuple	_rserv_log_(void);
+int32		_rserv_sync_(int32);
+int32		_rserv_debug_(int32);
+#endif
+
+static int	debug = 0;
+
+static char* OutputValue(char *key, char *buf, int size);
+
+#ifdef PG_FUNCTION_INFO_V1
+Datum
+_rserv_log_(PG_FUNCTION_ARGS)
+#else
+HeapTuple
+_rserv_log_()
+#endif
+{
+	Trigger    *trigger;		/* to get trigger name */
+	int			nargs;			/* # of args specified in CREATE TRIGGER */
+	char	  **args;			/* argument: argnum */
+	Relation	rel;			/* triggered relation */
+	HeapTuple	tuple;			/* tuple to return */
+	HeapTuple	newtuple = NULL;/* tuple to return */
+	TupleDesc	tupdesc;		/* tuple description */
+	int			keynum;
+	char	   *key;
+	char	   *okey;
+	char	   *newkey = NULL;
+	int			deleted;
+	char		sql[8192];
+	char		outbuf[8192];
+	char		oidbuf[64];
+	int			ret;
+
+	/* Called by trigger manager ? */
+	if (!CurrentTriggerData)
+		elog(ERROR, "_rserv_log_: triggers are not initialized");
+
+	/* Should be called for ROW trigger */
+	if (TRIGGER_FIRED_FOR_STATEMENT(CurrentTriggerData->tg_event))
+		elog(ERROR, "_rserv_log_: can't process STATEMENT events");
+
+	tuple = CurrentTriggerData->tg_trigtuple;
+
+	trigger = CurrentTriggerData->tg_trigger;
+	nargs = trigger->tgnargs;
+	args = trigger->tgargs;
+
+	if (nargs != 1)			/* odd number of arguments! */
+		elog(ERROR, "_rserv_log_: need in *one* argument");
+
+	keynum = atoi(args[0]);
+
+	if (keynum < 0 && keynum != ObjectIdAttributeNumber)
+		elog(ERROR, "_rserv_log_: invalid keynum %d", keynum);
+
+	rel = CurrentTriggerData->tg_relation;
+	tupdesc = rel->rd_att;
+
+	deleted = (TRIGGER_FIRED_BY_DELETE(CurrentTriggerData->tg_event)) ? 
+		1 : 0;
+
+	if (TRIGGER_FIRED_BY_UPDATE(CurrentTriggerData->tg_event))
+		newtuple = CurrentTriggerData->tg_newtuple;
+
+	/*
+	 * Setting CurrentTriggerData to NULL prevents direct calls to trigger
+	 * functions in queries. Normally, trigger functions have to be called
+	 * by trigger manager code only.
+	 */
+	CurrentTriggerData = NULL;
+
+	/* Connect to SPI manager */
+	if ((ret = SPI_connect()) < 0)
+		elog(ERROR, "_rserv_log_: SPI_connect returned %d", ret);
+
+	if (keynum == ObjectIdAttributeNumber)
+	{
+		sprintf(oidbuf, "%u", tuple->t_data->t_oid);
+		key = oidbuf;
+	}
+	else
+		key = SPI_getvalue(tuple, tupdesc, keynum);
+
+	if (key == NULL)
+		elog(ERROR, "_rserv_log_: key must be not null");
+
+	if (newtuple && keynum != ObjectIdAttributeNumber)
+	{
+		newkey = SPI_getvalue(newtuple, tupdesc, keynum);
+		if (newkey == NULL)
+			elog(ERROR, "_rserv_log_: key must be not null");
+		if (strcmp(newkey, key) == 0)
+			newkey = NULL;
+		else
+			deleted = 1;	/* old key was deleted */
+	}
+
+	if (strpbrk(key, "\\	\n'"))
+		okey = OutputValue(key, outbuf, sizeof(outbuf));
+	else
+		okey = key;
+
+	sprintf(sql, "update _RSERV_LOG_ set logid = %d, logtime = now(), "
+			"deleted = %d where reloid = %u and key = '%s'", 
+			GetCurrentTransactionId(), deleted, rel->rd_id, okey);
+
+	if (debug)
+		elog(NOTICE, sql);
+
+	ret = SPI_exec(sql, 0);
+
+	if (ret < 0)
+		elog(ERROR, "_rserv_log_: SPI_exec(update) returned %d", ret);
+
+	/*
+	 * If no tuple was UPDATEd then do INSERT...
+	 */
+	if (SPI_processed > 1)
+		elog(ERROR, "_rserv_log_: duplicate tuples");
+	else if (SPI_processed == 0)
+	{
+		sprintf(sql, "insert into _RSERV_LOG_ "
+				"(reloid, logid, logtime, deleted, key) "
+				"values (%u, %d, now(), %d, '%s')",
+				rel->rd_id, GetCurrentTransactionId(), 
+				deleted, okey);
+
+		if (debug)
+			elog(NOTICE, sql);
+
+		ret = SPI_exec(sql, 0);
+
+		if (ret < 0)
+			elog(ERROR, "_rserv_log_: SPI_exec(insert) returned %d", ret);
+	}
+
+	if (okey != key && okey != outbuf)
+		pfree(okey);
+
+	if (newkey)
+	{
+		if (strpbrk(newkey, "\\	\n'"))
+			okey = OutputValue(newkey, outbuf, sizeof(outbuf));
+		else
+			okey = newkey;
+
+		sprintf(sql, "insert into _RSERV_LOG_ "
+				"(reloid, logid, logtime, deleted, key) "
+				"values (%u, %d, now(), 0, '%s')", 
+				rel->rd_id, GetCurrentTransactionId(), okey);
+
+		if (debug)
+			elog(NOTICE, sql);
+
+		ret = SPI_exec(sql, 0);
+
+		if (ret < 0)
+			elog(ERROR, "_rserv_log_: SPI_exec returned %d", ret);
+
+		if (okey != newkey && okey != outbuf)
+			pfree(okey);
+	}
+
+	SPI_finish();
+
+#ifdef PG_FUNCTION_INFO_V1
+	return (PointerGetDatum(tuple));
+#else
+	return (tuple);
+#endif
+}
+
+#ifdef PG_FUNCTION_INFO_V1
+Datum
+_rserv_sync_(PG_FUNCTION_ARGS)
+#else
+int32
+_rserv_sync_(int32 server)
+#endif
+{
+#ifdef PG_FUNCTION_INFO_V1
+	int32 server = PG_GETARG_INT32(0);
+#endif
+	char	sql[8192];
+	char	buf[8192];
+	char   *active = buf;
+	uint32	xcnt;
+	int		ret;
+
+	if (SerializableSnapshot == NULL)
+		elog(ERROR, "_rserv_sync_: SerializableSnapshot is NULL");
+
+	buf[0] = 0;
+	for (xcnt = 0; xcnt < SerializableSnapshot->xcnt; xcnt++)
+	{
+		sprintf(buf + strlen(buf), "%s%u", (xcnt) ? ", " : "",
+			SerializableSnapshot->xip[xcnt]);
+	}
+
+	if ((ret = SPI_connect()) < 0)
+		elog(ERROR, "_rserv_sync_: SPI_connect returned %d", ret);
+
+	sprintf(sql, "insert into _RSERV_SYNC_ "
+			"(server, syncid, synctime, status, minid, maxid, active) "
+			"values (%u, currval('_rserv_sync_seq_'), now(), 0, %d, %d, '%s')", 
+			server, SerializableSnapshot->xmin, SerializableSnapshot->xmax, active);
+
+	ret = SPI_exec(sql, 0);
+
+	if (ret < 0)
+		elog(ERROR, "_rserv_sync_: SPI_exec returned %d", ret);
+
+	SPI_finish();
+
+	return (0);
+}
+
+#ifdef PG_FUNCTION_INFO_V1
+Datum
+_rserv_debug_(PG_FUNCTION_ARGS)
+#else
+int32
+_rserv_debug_(int32 newval)
+#endif
+{
+#ifdef PG_FUNCTION_INFO_V1
+	int32	newval = PG_GETARG_INT32(0);
+#endif
+	int32	oldval = debug;
+
+	debug = newval;
+
+	return (oldval);
+}
+
+#define	ExtendBy	1024
+
+static char*
+OutputValue(char *key, char *buf, int size)
+{
+	int			i = 0;
+	char	   *out = buf;
+	char	   *subst = NULL;
+	int			slen = 0;
+
+	size--;
+	for ( ; ; )
+	{
+		switch (*key)
+		{
+			case '\\':	subst ="\\\\";
+						slen = 2;
+						break;
+			case '	':	subst = "\\011";
+						slen = 4;
+						break;
+			case '\n':	subst = "\\012";
+						slen = 4;
+						break;
+			case '\'':	subst = "\\047";
+						slen = 4;
+						break;
+			case '\0':	out[i] = 0;
+						return(out);
+			default:	slen = 1;
+						break;
+		}
+
+		if (i + slen >= size)
+		{
+			if (out == buf)
+			{
+				out = (char*) palloc(size + ExtendBy);
+				strncpy(out, buf, i);
+				size += ExtendBy;
+			}
+			else
+			{
+				out = (char*) repalloc(out, size + ExtendBy);
+				size += ExtendBy;
+			}
+		}
+
+		if (slen == 1)
+			out[i++] = *key;
+		else
+		{
+			memcpy(out + i, subst, slen);
+			i += slen;
+		}
+		key++;
+	}
+
+	return(out);
+
+}
--- a/contrib/rserv/slave.sql.in
+++ b/contrib/rserv/slave.sql.in
@ -0,0 +1,22 @@
+-- erServer
+-- Slave server setup for erServer demonstration implementation
+-- (c) 2000 Vadim Mikheev, PostgreSQL Inc.
+--
+
+drop table _RSERV_SLAVE_TABLES_;
+
+create table _RSERV_SLAVE_TABLES_
+(
+	tname  name,	-- table name
+	cname  name,	-- column name
+	reloid	oid,	-- table oid
+	key		int4	-- key attnum 
+);
+
+drop table _RSERV_SLAVE_SYNC_;
+
+create table _RSERV_SLAVE_SYNC_
+(
+	syncid		int4,
+	synctime	timestamp
+);