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Release notes updates from Neil Conway.

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REL7_4_STABLE
Bruce Momjian 22 years ago
parent 70f567d571
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      HISTORY
  2. 130
      doc/src/sgml/release.sgml

118
HISTORY
Unescape View File

@ -2,12 +2,24 @@
Release Notes
Release 7.4
_________________________________________________________________
Overview
Major changes in this release:
Performance
IN/NOT IN subqueries are now much more efficient
Improved GROUP BY processing by using hash buckets
New multi-key hash join capability
ANSI joins are now better optimized
Faster and more powerful regular expression code
Function-inlining for simple SQL functions
IPv6
Full support for IPv6 connections and IPv6 address data types
@ -19,7 +31,9 @@
and other free space management improvements.
Standards Compliance
Implement information schema Support for read-only transactions
Implement information schema
Support for read-only transactions
Make cursors comply more closely with the SQL standard
@ -28,19 +42,6 @@
error codes, status information, a binary protocol, error
reporting verbosity, and cleaner startup packets.
Performance
IN/NOT IN subqueries now perform as efficiently as joins
Improved GROUP BY processing by using hash buckets
New multi-key hash join capability
ANSI joins are now better optimized
Faster and more powerful regular expression code
Function-inlining for simple SQL functions
Holdable Cursors
Allow cursors to exist outside transactions
@ -67,8 +68,8 @@
in client applications and languages.
* Error message wording has changed substantially in this release,
and error codes have been added.
* ANSI joins may behave differently because they are now better
optimized
* ANSI inner joins may behave differently because they are now
better optimized
* A number of server variables have been renamed for clarity
* MOVE/FETCH 0 now does nothing; return value of MOVE/FETCH 1/0
varies based on the current offset in the cursor
@ -144,11 +145,12 @@ Performance
* Assume WHERE a.x = b.y and b.y = 42 also means a.x = 42 (Tom)
* Allow hash/merge joins on complex joins (Tom)
* Allow hash joins for more data types (Tom)
* Allow join optimization of ANSI joins, disable with
* Allow join optimization of ANSI inner joins, disable with
join_collapse_limit (Tom)
* Add from_collapse_limit to control conversion of subqueries to
joins (Tom)
* Use faster regular expression code from TCL (Henry Spencer, Tom)
* Use faster and more powerful regular expression code from TCL
(Henry Spencer, Tom)
* Use bit-mapped relation sets in the optimizer (Tom)
* Improve backend startup time (Tom)
* Improve trigger/constraint performance (Stephan)
@ -157,6 +159,8 @@ Performance
* Improve hash index concurrency and speed (Tom)
* Align shared buffers on 32-byte boundary for copy speed
improvement (Manfred Spraul)
* The NUMERIC datatype has been reimplemented for better performance
(Tom)
_________________________________________________________________
Server Configuration
@ -182,8 +186,8 @@ Server Configuration
* New is_superuser read-only variable (Tom)
* New server-side parameter log_error_verbosity to control error
detail (Tom)
* postgres --help-config now dumps server config variables (Aizaz
Ahmed)
* postgres --describe-config now dumps server config variables
(Aizaz Ahmed, Peter)
* Make default shared_buffers 1000 and max_connections 100, if
possible (Tom)
* Add new columns in pg_settings: context, type, source, min_val,
@ -237,10 +241,10 @@ Object Manipulation
Utility Commands
* Add ON COMMIT PRESERVE ROWS for temp tables (Gavin)
* Add ON COMMIT clause to CREATE TABLE for temp tables (Gavin)
* Allow cursors outside transactions using WITH HOLD (Neil)
* Make MOVE/FETCH 0 actually move/fetch 0 (Bruce)
* Cause FETCH 1 to return the current cursor row, or zero if at
* Cause FETCH 1 to return the next cursor row number, or zero if at
beginning/end of cursor, per SQL spec (Bruce)
* Have MOVE return 0 or 1 depending on cursor position (Bruce)
* Properly handle SCROLL with cursors, or report an error (Neil)
@ -277,7 +281,8 @@ Utility Commands
* Improve VACUUM performance on indexes by reducing WAL traffic
(Tom)
* Allow pg_ctl to better handle non-standard ports (Greg)
* Functional indexes now support indexes on column expressions (Tom)
* Functional indexes have been generalized into expressional indexes
(Tom)
* Syntax errors now reported as 'syntax error' rather than 'parse
error' (Tom)
* Have SHOW TRANSACTION_ISOLATION match input to SET
@ -289,6 +294,7 @@ Utility Commands
indexes (Tom)
* pg_dump --use-set-session-authorization and --no-reconnect now do
nothing, all dumps use SET SESSION AUTHORIZATION
* Long options for pg_dump are now available on all platforms
_________________________________________________________________
Data Types and Functions
@ -331,8 +337,7 @@ Data Types and Functions
* Allow the creation of special LIKE indexes for non-C locales
(Peter)
* Disallow invalid timezone names (Tom)
* Trim trailing spaces when CHAR() data is cast to VARCHAR or TEXT
(Tom)
* Trim trailing spaces when CHAR() is cast to VARCHAR or TEXT (Tom)
* Make FLOAT(p) measure the precision p in bits, not decimal digits
(Tom)
* Add IPv6 support to the inet and cidr data types (Michael Graff)
@ -340,7 +345,6 @@ Data Types and Functions
(Michael Graff)
* Have SHOW DATESTYLE generate output similar to that used by SET
DATESTYLE (Tom)
* Change DATESTYLE to output its value in a more common format (Tom)
* Make EXTRACT(TIMEZONE) and SET/SHOW TIMEZONE follow the SQL
convention for the sign of timezone offsets, ie, positive is east
from UTC (Tom)
@ -387,7 +391,8 @@ Psql
* Add "\pset pager always" to always use pager (Greg)
* Improve tab completion (Rod, Ross Reedstrom, Ian Barwick)
* Reorder \? help into groupings (Harald Armin Massa, Bruce)
* Add schema, cast, and conversion backslash commands (Christopher)
* Add backslash commands for listing schemas, casts, and conversions
(Christopher)
* \encoding now changes based on client_encoding server variable
(Tom)
* Save edit history into readline history (Ross)
@ -396,6 +401,7 @@ Psql
* New '\set AUTOCOMMIT off' capability (Tom)
* New '\set VERBOSITY' to control error detail (Tom)
* New %T prompt string to show transaction status (Tom)
* Long options for psql are now available on all platforms
_________________________________________________________________
Libpq
@ -448,7 +454,7 @@ Source Code
files (Tom)
* Improved PPC locking primitive (Reinhard Max)
* Embed LD_LIBRARY_PATH used for build process into binaries (Billy)
* New palloc0 to allocate and clear memory (Bruce)
* New palloc0 function to allocate and clear memory (Bruce)
* Fix locking code for s390x CPU (64-bit) (Tom)
* Allow OpenBSD to use local ident credentials (William Ahern)
* Make query plan trees read-only to executor (Tom)
@ -457,7 +463,8 @@ Source Code
Karl Waclawek)
* Use our own version of getopt_long() if needed (Peter)
* Convert administration scripts to C (Peter)
* Bison >=1.85 is now required for grammar changes
* Bison >= 1.85 is now required to build the PostgreSQL grammar, if
building from CVS
* Merge documentation into one book (Peter)
* Add Win32 compatibility functions (Bruce)
* Allow client interfaces to compile under MinGW/Win32 (Bruce)
@ -465,7 +472,7 @@ Source Code
* Support Intel Linux compiler (Peter)
* Improve Linux startup scripts (Slawomir Sudnik, Darko Prenosil)
* Add support for AMD Opteron and Itanium (Jeffrey W. Baker, Bruce)
* Remove configure --enable-recode
* Remove --enable-recode option to configure
* Generate a compile error if spinlock code is not found (Bruce)
_________________________________________________________________
@ -500,60 +507,11 @@ Contrib
Other Uncategorized
* EXTRACT(TIMEZONE) and "SET/SHOW TIMEZONE " now follow SQL sign
convention (positive = east of UTC)
* "DATESTYLE" can now be set to DMY, YMD, or MDY to specify input
field order
* Input date order must now be YYYY-MM-DD (with 4-digit year) or
match DATESTYLE
* Output of "SHOW DATESTYLE" is now in the same format accepted by
"SET DATESTYLE"
* PL/Python is now an untrusted language, and is renamed to
plpythonu
* Dollar sign ($) is no longer allowed in operator names
* Dollar sign ($) can be a non-first character in identifiers
* Precision in FLOAT(p) is now interpreted as bits, not decimal
digits
* Functional indexes have been generalized into expressional indexes
* CHAR(n) to TEXT conversion automatically strips trailing blanks
* Pattern matching operations can use indexes regardless of locale
* New frontend/backend protocol supports many long-requested
features
* "SET AUTOCOMMIT TO OFF" is no longer supported; psql has an
AUTOCOMMIT variable
* Reimplementation of NUMERIC datatype for more speed
* New regular expression package, many more regexp features (most of
Perl5)
* Can now do " EXPLAIN" ... "EXECUTE" to see plan used for a
prepared query
* Explicit "JOIN"s no longer constrain query plan, unless
"JOIN_COLLAPSE_LIMIT = 1"
* Performance of "foo IN (SELECT ...)" queries has been considerably
improved
* "FETCH 0" now re-fetches cursor's current row, per SQL spec
* Revised executor state representation; plan trees are read-only to
executor now
* Information schema
* Domains now support "CHECK" constraints
* psql backslash commands for listing conversions, casts, and
schemas
* "TRUNCATE TABLE" is transaction-safe
* "CLUSTER" can re-cluster a previously clustered table, or all such
tables
* Statement-level triggers
* System can use either hash- or sort-based strategy for grouped
aggregation
* "ON COMMIT" options for temp tables
* extra_float_digits option allows pg_dump to dump float data
accurately
* Long options for psql and pg_dump are now available on all
platforms
* Read-only transactions
* Object owners can allow grantees to grant the privilege to others
(grant option)
* Added "contrib" module for pg_autovacuum which monitors inserts
and deletes, and does "ANALYZE" or " VACUUM ANALYZE " when
quantities exceed specified thresholds.
_________________________________________________________________
Release 7.3.4

130
doc/src/sgml/release.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/release.sgml,v 1.215 2003/10/22 05:09:12 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/release.sgml,v 1.216 2003/10/22 17:27:14 momjian Exp $
-->
<appendix id="release">
@ -8,27 +8,25 @@ $Header: /cvsroot/pgsql/doc/src/sgml/release.sgml,v 1.215 2003/10/22 05:09:12 mo
<sect1 id="release-devel">
<title>Release 7.4</title>
<!--
<para>
Below is a subset of the changes that have gone into the
development branch of <productname>PostgreSQL</productname> since
version 7.3. For a complete list of changes, consult the CVS logs.
<sect2><title>Overview</title>
<para> Major changes in this release:
<glosslist>
<glossentry><glossterm> Performance</glossterm>
<glossdef><para> IN/NOT IN subqueries are now much more efficient
</para>
Developers: When you add a feature, mention it here. This avoids
lossiness when digging out the information from the CVS logs, and
furthermore it advertises your feature to external parties at the
earliest possible moment.
<para> Improved GROUP BY processing by using hash buckets</para>
CDATA means the content is "SGML-free", so you can write without
worries about funny characters.
-->
<literallayout><![CDATA[
]]></literallayout>
<para> New multi-key hash join capability</para>
<sect2><title>Overview</title>
<para> Major changes in this release:
<glosslist>
<para> ANSI joins are now better optimized</para>
<para> Faster and more powerful regular expression code</para>
<para> Function-inlining for simple SQL functions</para></glossdef>
</glossentry>
<glossentry> <glossterm> IPv6</glossterm>
@ -50,8 +48,9 @@ pages, and other free space management improvements.</para></glossdef>
<glossentry><glossterm> Standards Compliance</glossterm>
<glossdef><para> Implement information schema Support for read-only
transactions </para>
<glossdef><para>Implement information schema</para>
<para>Support for read-only transactions </para>
<para>Make cursors comply more closely with the SQL standard
</para></glossdef>
@ -66,22 +65,6 @@ and adds error codes, status information, a binary protocol, error
reporting verbosity, and cleaner startup packets.</para></glossdef>
</glossentry>
<glossentry><glossterm> Performance</glossterm>
<glossdef><para> IN/NOT IN subqueries now perform as efficiently as
joins</para>
<para> Improved GROUP BY processing by using hash buckets</para>
<para> New multi-key hash join capability</para>
<para> ANSI joins are now better optimized</para>
<para> Faster and more powerful regular expression code</para>
<para> Function-inlining for simple SQL functions</para></glossdef>
</glossentry>
<glossentry><glossterm> Holdable Cursors</glossterm>
<glossdef><para> Allow cursors to exist outside transactions
@ -116,7 +99,7 @@ required for those wishing to migrate data from any previous release.</para>
in client applications and languages.</para></listitem>
<listitem><para> Error message wording has changed substantially in this release,
and error codes have been added.</para></listitem>
<listitem><para> ANSI joins may behave differently because they are now better optimized</para></listitem>
<listitem><para> ANSI inner joins may behave differently because they are now better optimized</para></listitem>
<listitem><para> A number of server variables have been renamed for clarity</para></listitem>
<listitem><para> MOVE/FETCH 0 now does nothing; return value of MOVE/FETCH 1/0
varies based on the current offset in the cursor</para></listitem>
@ -185,9 +168,9 @@ required for those wishing to migrate data from any previous release.</para>
<listitem><para>Assume WHERE a.x = b.y and b.y = 42 also means a.x = 42 (Tom)</para></listitem>
<listitem><para>Allow hash/merge joins on complex joins (Tom)</para></listitem>
<listitem><para>Allow hash joins for more data types (Tom)</para></listitem>
<listitem><para>Allow join optimization of ANSI joins, disable with join_collapse_limit (Tom)</para></listitem>
<listitem><para>Allow join optimization of ANSI inner joins, disable with join_collapse_limit (Tom)</para></listitem>
<listitem><para>Add from_collapse_limit to control conversion of subqueries to joins (Tom)</para></listitem>
<listitem><para>Use faster regular expression code from TCL (Henry Spencer, Tom)</para></listitem>
<listitem><para>Use faster and more powerful regular expression code from TCL (Henry Spencer, Tom)</para></listitem>
<listitem><para>Use bit-mapped relation sets in the optimizer (Tom)</para></listitem>
<listitem><para>Improve backend startup time (Tom)</para></listitem>
<listitem><para>Improve trigger/constraint performance (Stephan)</para></listitem>
@ -195,6 +178,7 @@ required for those wishing to migrate data from any previous release.</para>
<listitem><para>Fix hash indexes which were broken in rare cases (Tom)</para></listitem>
<listitem><para>Improve hash index concurrency and speed (Tom)</para></listitem>
<listitem><para>Align shared buffers on 32-byte boundary for copy speed improvement (Manfred Spraul)</para></listitem>
<listitem><para>The NUMERIC datatype has been reimplemented for better performance (Tom)</para></listitem>
</itemizedlist></sect3>
<sect3><title>Server Configuration</title>
@ -215,7 +199,7 @@ required for those wishing to migrate data from any previous release.</para>
<listitem><para>Allow pg_hba.conf to accept netmasks in CIDR format (Andrew Dunstan)</para></listitem>
<listitem><para>New is_superuser read-only variable (Tom)</para></listitem>
<listitem><para>New server-side parameter log_error_verbosity to control error detail (Tom)</para></listitem>
<listitem><para>postgres --help-config now dumps server config variables (Aizaz Ahmed)</para></listitem>
<listitem><para>postgres --describe-config now dumps server config variables (Aizaz Ahmed, Peter)</para></listitem>
<listitem><para>Make default shared_buffers 1000 and max_connections 100, if possible (Tom)</para></listitem>
<listitem><para>Add new columns in pg_settings: context, type, source, min_val, max_val (Joe)</para></listitem>
<listitem><para>New pg_hba.conf 'hostnossl' to prevent SSL connections (Jon Jensen)</para></listitem>
@ -262,10 +246,10 @@ required for those wishing to migrate data from any previous release.</para>
<sect3><title>Utility Commands</title>
<itemizedlist>
<listitem><para>Add ON COMMIT PRESERVE ROWS for temp tables (Gavin)</para></listitem>
<listitem><para>Add ON COMMIT clause to CREATE TABLE for temp tables (Gavin)</para></listitem>
<listitem><para>Allow cursors outside transactions using WITH HOLD (Neil)</para></listitem>
<listitem><para>Make MOVE/FETCH 0 actually move/fetch 0 (Bruce)</para></listitem>
<listitem><para>Cause FETCH 1 to return the current cursor row, or zero if at
<listitem><para>Cause FETCH 1 to return the next cursor row number, or zero if at
beginning/end of cursor, per SQL spec (Bruce)</para></listitem>
<listitem><para>Have MOVE return 0 or 1 depending on cursor position (Bruce)</para></listitem>
<listitem><para>Properly handle SCROLL with cursors, or report an error (Neil)</para></listitem>
@ -295,7 +279,7 @@ required for those wishing to migrate data from any previous release.</para>
CHECK constraints (Christopher)</para></listitem>
<listitem><para>Improve VACUUM performance on indexes by reducing WAL traffic (Tom)</para></listitem>
<listitem><para>Allow pg_ctl to better handle non-standard ports (Greg)</para></listitem>
<listitem><para>Functional indexes now support indexes on column expressions (Tom)</para></listitem>
<listitem><para>Functional indexes have been generalized into expressional indexes (Tom)</para></listitem>
<listitem><para>Syntax errors now reported as 'syntax error' rather than 'parse error' (Tom)</para></listitem>
<listitem><para>Have SHOW TRANSACTION_ISOLATION match input to SET TRANSACTION_ISOLATION (Tom)</para></listitem>
<listitem><para>Have COMMENT ON DATABASE on non-local database generate a warning (Rod)</para></listitem>
@ -303,6 +287,7 @@ required for those wishing to migrate data from any previous release.</para>
<listitem><para>Allow REINDEX to reliably reindex non-shared system catalog indexes (Tom)</para></listitem>
<listitem><para>pg_dump --use-set-session-authorization and --no-reconnect now do nothing,
all dumps use SET SESSION AUTHORIZATION</para></listitem>
<listitem><para>Long options for <application>pg_dump</application> are now available on all platforms</para></listitem>
</itemizedlist></sect3>
@ -338,12 +323,11 @@ required for those wishing to migrate data from any previous release.</para>
<listitem><para>Allow CIDR data type to be cast to text (Tom)</para></listitem>
<listitem><para>Allow the creation of special LIKE indexes for non-C locales (Peter)</para></listitem>
<listitem><para>Disallow invalid timezone names (Tom)</para></listitem>
<listitem><para>Trim trailing spaces when CHAR() data is cast to VARCHAR or TEXT (Tom)</para></listitem>
<listitem><para>Trim trailing spaces when CHAR() is cast to VARCHAR or TEXT (Tom)</para></listitem>
<listitem><para>Make FLOAT(p) measure the precision p in bits, not decimal digits (Tom)</para></listitem>
<listitem><para>Add IPv6 support to the inet and cidr data types (Michael Graff)</para></listitem>
<listitem><para>Add family() function to report whether address is IPv4 or IPv6 (Michael Graff)</para></listitem>
<listitem><para>Have SHOW DATESTYLE generate output similar to that used by SET DATESTYLE (Tom)</para></listitem>
<listitem><para>Change DATESTYLE to output its value in a more common format (Tom)</para></listitem>
<listitem><para>Make EXTRACT(TIMEZONE) and SET/SHOW TIMEZONE follow the SQL convention
for the sign of timezone offsets, ie, positive is east from UTC (Tom)</para></listitem>
<listitem><para>Fix date_trunc('quarter',...) (B?jthe Zolt?n)</para></listitem>
@ -383,7 +367,7 @@ required for those wishing to migrate data from any previous release.</para>
<listitem><para>Add "\pset pager always" to always use pager (Greg)</para></listitem>
<listitem><para>Improve tab completion (Rod, Ross Reedstrom, Ian Barwick)</para></listitem>
<listitem><para>Reorder \? help into groupings (Harald Armin Massa, Bruce)</para></listitem>
<listitem><para>Add schema, cast, and conversion backslash commands (Christopher)</para></listitem>
<listitem><para>Add backslash commands for listing schemas, casts, and conversions (Christopher)</para></listitem>
<listitem><para>\encoding now changes based on client_encoding server variable (Tom)</para></listitem>
<listitem><para>Save edit history into readline history (Ross)</para></listitem>
<listitem><para>Improve \d display (Christopher)</para></listitem>
@ -391,6 +375,7 @@ required for those wishing to migrate data from any previous release.</para>
<listitem><para>New '\set AUTOCOMMIT off' capability (Tom)</para></listitem>
<listitem><para>New '\set VERBOSITY' to control error detail (Tom)</para></listitem>
<listitem><para>New %T prompt string to show transaction status (Tom)</para></listitem>
<listitem><para>Long options for <application>psql</application> are now available on all platforms</para></listitem>
</itemizedlist></sect3>
<sect3><title>Libpq</title>
@ -441,7 +426,7 @@ required for those wishing to migrate data from any previous release.</para>
<listitem><para>Prevent need for separate platform geometry regression result files (Tom)</para></listitem>
<listitem><para>Improved PPC locking primitive (Reinhard Max)</para></listitem>
<listitem><para>Embed LD_LIBRARY_PATH used for build process into binaries (Billy)</para></listitem>
<listitem><para>New palloc0 to allocate and clear memory (Bruce)</para></listitem>
<listitem><para>New palloc0 function to allocate and clear memory (Bruce)</para></listitem>
<listitem><para>Fix locking code for s390x CPU (64-bit) (Tom)</para></listitem>
<listitem><para>Allow OpenBSD to use local ident credentials (William Ahern)</para></listitem>
<listitem><para>Make query plan trees read-only to executor (Tom)</para></listitem>
@ -449,7 +434,7 @@ required for those wishing to migrate data from any previous release.</para>
<listitem><para>Allow libpq to compile with Borland C++ compiler (Lester Godwin, Karl Waclawek)</para></listitem>
<listitem><para>Use our own version of getopt_long() if needed (Peter)</para></listitem>
<listitem><para>Convert administration scripts to C (Peter)</para></listitem>
<listitem><para>Bison >=1.85 is now required for grammar changes</para></listitem>
<listitem><para>Bison >= 1.85 is now required to build the PostgreSQL grammar, if building from CVS</para></listitem>
<listitem><para>Merge documentation into one book (Peter)</para></listitem>
<listitem><para>Add Win32 compatibility functions (Bruce)</para></listitem>
<listitem><para>Allow client interfaces to compile under MinGW/Win32 (Bruce)</para></listitem>
@ -457,7 +442,7 @@ required for those wishing to migrate data from any previous release.</para>
<listitem><para>Support Intel Linux compiler (Peter)</para></listitem>
<listitem><para>Improve Linux startup scripts (Slawomir Sudnik, Darko Prenosil)</para></listitem>
<listitem><para>Add support for AMD Opteron and Itanium (Jeffrey W. Baker, Bruce)</para></listitem>
<listitem><para>Remove configure --enable-recode</para></listitem>
<listitem><para>Remove --enable-recode option to configure</para></listitem>
<listitem><para>Generate a compile error if spinlock code is not found (Bruce)</para></listitem>
</itemizedlist></sect3>
@ -490,61 +475,14 @@ required for those wishing to migrate data from any previous release.</para>
<sect3> <title> Other Uncategorized</title>
<itemizedlist>
<listitem><para><function>EXTRACT(TIMEZONE)</function> and <command>SET/SHOW
TIMEZONE </command> now follow SQL sign convention
(positive = east of UTC)</para></listitem>
<listitem><para><command>DATESTYLE</command> can now be set to DMY, YMD, or MDY to specify input field order</para></listitem>
<listitem><para>Input date order must now be YYYY-MM-DD (with 4-digit
year) or match <envar>DATESTYLE</envar></para></listitem>
<listitem><para>Output of <command>SHOW DATESTYLE</command> is now in the same
format accepted by <command>SET DATESTYLE</command></para></listitem>
<listitem><para>PL/Python is now an untrusted language, and is renamed
to <function>plpythonu</function></para></listitem>
<listitem><para>Dollar sign ($) is no longer allowed in operator names</para></listitem>
<listitem><para>Dollar sign ($) can be a non-first character in identifiers</para></listitem>
<listitem><para>Precision in <function> FLOAT(p)</function> is now interpreted as bits, not decimal digits</para></listitem>
<listitem><para>Functional indexes have been generalized into expressional indexes</para></listitem>
<listitem><para><function>CHAR(n)</function> to <function>TEXT</function> conversion automatically strips trailing blanks</para></listitem>
<listitem><para>Pattern matching operations can use indexes regardless of locale</para></listitem>
<listitem><para>New frontend/backend protocol supports many long-requested features</para></listitem>
<listitem><para><command>SET AUTOCOMMIT TO OFF</command> is no longer
supported; psql has an <envar>AUTOCOMMIT</envar> variable</para></listitem>
<listitem><para>Reimplementation of NUMERIC datatype for more speed</para></listitem>
<listitem><para>New regular expression package, many more regexp features (most of Perl5)</para></listitem>
<listitem><para>Can now do <command> EXPLAIN</command> ... <command>EXECUTE</command> to see plan used for a prepared query</para></listitem>
<listitem><para>Explicit <command>JOIN</command>s no longer constrain query
plan, unless <command>JOIN_COLLAPSE_LIMIT = 1</command></para></listitem>
<listitem><para>Performance of <command>foo IN (SELECT ...)</command> queries has been considerably improved</para></listitem>
<listitem><para><command>FETCH 0</command> now re-fetches cursor's current row, per SQL spec</para></listitem>
<listitem><para>Revised executor state representation; plan trees are read-only to executor now</para></listitem>
<listitem><para>Information schema</para></listitem>
<listitem><para>Domains now support <command>CHECK</command> constraints</para></listitem>
<listitem><para><application>psql</application> backslash commands for listing conversions, casts, and schemas</para></listitem>
<listitem><para><command>TRUNCATE TABLE</command> is transaction-safe</para></listitem>
<listitem><para><command>CLUSTER</command> can re-cluster a previously clustered table, or all such tables</para></listitem>
<listitem><para>Statement-level triggers</para></listitem>
<listitem><para>System can use either hash- or sort-based strategy for grouped aggregation</para></listitem>
<listitem><para><command>ON COMMIT</command> options for temp tables</para></listitem>
<listitem><para>extra_float_digits option allows <application>pg_dump</application> to dump float data accurately</para></listitem>
<listitem><para>Long options for <application>psql</application> and
<application>pg_dump</application> are now available on all platforms</para></listitem>
<listitem><para>Read-only transactions</para></listitem>
<listitem><para>Object owners can allow grantees to grant the
privilege to others (grant option)</para></listitem>
<listitem><para> Added <filename>contrib</filename> module for
<application> pg_autovacuum </application> which monitors inserts and
deletes, and does <command>ANALYZE</command> or <command> VACUUM
ANALYZE </command> when quantities exceed specified
thresholds.</para></listitem>
</itemizedlist></sect3>
</sect2>
</sect1>
<sect1 id="release-7-3-4">
<title>Release 7.3.4</title>

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