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Further editing of release notes.

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Tom Lane 16 years ago
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      doc/src/sgml/release-9.0.sgml

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<!-- $PostgreSQL: pgsql/doc/src/sgml/release-9.0.sgml,v 2.51 2010/08/24 14:46:29 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/release-9.0.sgml,v 2.52 2010/08/24 23:45:32 tgl Exp $ -->
<sect1 id="release-9-0">
<title>Release 9.0</title>
@ -43,50 +43,48 @@
<listitem>
<para>
Easier database object permissions management. <link
linkend="SQL-GRANT"><command>GRANT</>/<command>REVOKE
IN SCHEMA</></link> supports mass permissions changes, and
the <link linkend="SQL-ALTERDEFAULTPRIVILEGES"><command>ALTER
DEFAULT PRIVILEGES</></link> command controls privileges
of all newly-created objects. Large object permissions now
support <command>GRANT</>/<command>REVOKE</> as well.
linkend="SQL-GRANT"><command>GRANT</>/<command>REVOKE IN
SCHEMA</></link> supports mass permissions changes on existing objects,
while <link linkend="SQL-ALTERDEFAULTPRIVILEGES"><command>ALTER DEFAULT
PRIVILEGES</></link> allows control of privileges for objects created in
the future. Large objects (BLOBs) now support privilege management as
well.
</para>
</listitem>
<listitem>
<para>
Add support for compiling on <link
linkend="install-win32-full">64-bit
<productname>Windows</></link> and running in 64-bit
mode.
Broadly enhanced stored procedure support.
The <link linkend="SQL-DO"><command>DO</></link> statement supports
ad-hoc or <quote>anonymous</> code blocks.
Functions can now be called using named parameters.
<link linkend="plpgsql">PL/pgSQL</link> is now installed by default, and
<link linkend="plperl">PL/Perl</link> and <link
linkend="plpython">PL/Python</link> have been enhanced in several ways,
including support for Python3.
</para>
</listitem>
<listitem>
<para>
Broadly enhanced stored procedure support.
The <link linkend="SQL-DO"><command>DO</></link> statement permits
ad-hoc or anonymous code blocks. Functions can now be called using named
parameters. <link linkend="plpgsql">PL/pgSQL</link> is now installed by default,
and <link linkend="plperl">PL/Perl</link> and <link linkend="plpython">PL/Python</link>
have been enhanced in several ways, including support for Python3.
Full support for <link linkend="install-win32">64-bit
<productname>Windows</></link>.
</para>
</listitem>
<listitem>
<para>
More advanced reporting queries with additional <link
linkend="functions-window">window functions</link>
(<literal>PRECEDING</> and <literal>FOLLOWING</>) and the ability
to <link linkend="syntax-aggregates"><literal>ORDER BY</></link>
inside aggregate functions.
More advanced reporting queries, including additional windowing options
(<literal>PRECEDING</> and <literal>FOLLOWING</>) and the ability to
control the order in which values are fed to aggregate functions.
</para>
</listitem>
<listitem>
<para>
Triggers now support two new features,
SQL-compliant <link
linkend="SQL-CREATETRIGGER">per-column triggers</link>, and
New trigger features, including
SQL-standard-compliant <link
linkend="SQL-CREATETRIGGER">per-column triggers</link> and
conditional trigger execution.
</para>
</listitem>
@ -101,68 +99,71 @@
<listitem>
<para>
New and enhanced security features, including <link linkend="client-authentication">RADIUS authentication</link>,
LDAP authentication improvements, and the new <link linkend="passwordcheck">passwordcheck</link> optional module
for testing password strength.
<link linkend="ddl-constraints-exclusion">Exclusion constraints</link>.
These provide a generalized version of unique constraints, allowing
enforcement of complex conditions.
</para>
</listitem>
<listitem>
<para>
The <link linkend="SQL-LISTEN"><command>LISTEN</></link>/<link
linkend="SQL-NOTIFY"><command>NOTIFY</></link>
feature has been overhauled to make it into
a high-performance event queuing system. It now stores
events in a memory-based queue, and it now allows delivery
of a string payload to listeners with each event.
New and enhanced security features, including RADIUS authentication,
LDAP authentication improvements, and a new contrib module
<link linkend="passwordcheck"><filename>passwordcheck</></link>
for testing password strength.
</para>
</listitem>
<listitem>
<para>
Add <link linkend="pgupgrade"><filename>/contrib/pg_upgrade</></link>
to support in-place upgrades from 8.3 or 8.4 to 9.0.
New high-performance implementation of the
<link linkend="SQL-LISTEN"><command>LISTEN</></link>/<link
linkend="SQL-NOTIFY"><command>NOTIFY</></link> feature.
Pending events are now stored in a memory-based queue rather than
a table. Also, a <quote>payload</> string can be sent with each
event, rather than transmitting just an event name as before.
</para>
</listitem>
<listitem>
<para>
Multiple performance enhancements for specific types of queries,
including join elimination, which optimizes automatically generated
queries, such as those produced by object-relational mappers (ORMs).
New implementation of
<link linkend="SQL-VACUUM"><command>VACUUM FULL</></link>.
This command now rewrites the entire table and indexes, rather than
moving individual rows to compact space. It is substantially faster
in most cases, and no longer results in index bloat.
</para>
</listitem>
<listitem>
<para>
<link linkend="ddl-constraints-exclusion">Exclusion constraints</link>
let database designers define uniqueness based on complex
criteria, including for non-scalar data such as time periods,
ranges and arrays.
New contrib module
<link linkend="pgupgrade"><filename>pg_upgrade</></link>
to support in-place upgrades from 8.3 or 8.4 to 9.0.
</para>
</listitem>
<listitem>
<para>
As part of our decade-long effort to eliminate the pain of VACUUM,
<link linkend="vacuum-for-space-recovery"><command>VACUUM FULL</></link>
is now substantially faster by rewriting the entire table and
indexes, rather than moving around single rows to compact space.
Multiple performance enhancements for specific types of queries,
including elimination of unnecessary joins. This helps optimize some
automatically-generated queries, such as those produced by
object-relational mappers (ORMs).
</para>
</listitem>
<listitem>
<para>
<link linkend="using-explain"><command>EXPLAIN</command></link>
plans are now available in JSON, XML and YAML format, and include
<link linkend="SQL-EXPLAIN "><command>EXPLAIN</></link> enhancements.
The output is now available in JSON, XML, or YAML format, and includes
buffer utilization and other data not previously available.
</para>
</listitem>
<listitem>
<para>
The <link linkend="hstore">HStore optional module</link> has been improved with new functions and greater
data capacity to make it a high-performance key-value store.
<link linkend="hstore"><filename>hstore</></link> improvements,
including new functions and greater data capacity.
</para>
</listitem>
@ -216,9 +217,9 @@
<listitem>
<para>
<link linkend="guc-wal-level"><varname>wal_level</></link> should now be
set to <literal>archive</>, not <literal>on</>, to do continuous
archiving (Heikki Linnakangas)
Replace server parameter <varname>archive_mode</> with
<link linkend="guc-wal-level"><varname>wal_level</></link>
(Heikki Linnakangas)
</para>
</listitem>
@ -252,18 +253,6 @@
</para>
</listitem>
<listitem>
<para>
Make <function>date_trunc</> truncate rather than round when reducing
fractional-seconds precision (Tom Lane)
</para>
<para>
The code always acted this way for integer-based dates/times.
Now float-based dates/times behave similarly.
</para>
</listitem>
</itemizedlist>
</sect3>
@ -316,6 +305,18 @@
</para>
</listitem>
<listitem>
<para>
Make <function>date_trunc</> truncate rather than round when reducing
precision of fractional seconds (Tom Lane)
</para>
<para>
The code always acted this way for integer-based dates/times.
Now float-based dates/times behave similarly.
</para>
</listitem>
</itemizedlist>
</sect3>
@ -550,11 +551,25 @@
</para>
</listitem>
<listitem>
<para>
Improve performance and reliability of EvalPlanQual rechecks in join
queries (Tom Lane)
</para>
<para>
<command>UPDATE</>, <command>DELETE</>, and <command>SELECT FOR
UPDATE/SHARE</> queries that involve joins will now behave much better
when encountering freshly-updated rows.
</para>
</listitem>
<listitem>
<para>
Improve performance of <link
linkend="SQL-TRUNCATE"><command>TRUNCATE</></link> when
used in the same transaction as table creation (Tom Lane)
the table was created or truncated earlier in the same transaction
(Tom Lane)
</para>
</listitem>
@ -580,8 +595,8 @@
</para>
<para>
Outer joins where the inner side is unique and not referenced in
the query are unnecessary and are therefore now removed. This will
Outer joins where the inner side is unique and not referenced above
the join are unnecessary and are therefore now removed. This will
accelerate many automatically generated queries, such as those created
by object-relational mappers (ORMs).
</para>
@ -599,6 +614,14 @@
</para>
</listitem>
<listitem>
<para>
Improve the optimizer's choices about when to use materialize nodes,
and when to use sorting versus hashing for <literal>DISTINCT</>
(Tom Lane)
</para>
</listitem>
<listitem>
<para>
Improve the optimizer's equivalence detection for expressions involving
@ -634,7 +657,8 @@
</para>
<para>
This avoids the rare error <quote>failed to make a valid plan</>.
This avoids the rare error <quote>failed to make a valid plan</>,
and should also improve planning speed.
</para>
</listitem>
@ -823,7 +847,7 @@
Add <link
linkend="monitoring-stats-funcs-table"><function>pg_stat_reset_single_table_counters()</></link>
and <function>pg_stat_reset_single_function_counters()</>
to allow resetting of the statistics counters for individual
to allow resetting the statistics counters for individual
tables and indexes (Magnus Hagander)
</para>
</listitem>
@ -849,9 +873,11 @@
not combinations. All role and database settings are now stored
in the new <structname>pg_db_role_setting</> system table. A new
<application>psql</> command <literal>\drds</> shows these settings.
Backwards-compatible system views do not show combination settings.
The legacy system views <structname>pg_roles</>,
<structname>pg_shadow</>, and <structname>pg_user</>
do not show combination settings, and therefore no longer
completely represent the configuration for a user or database.
</para>
</listitem>
<listitem>
@ -884,6 +910,19 @@
</para>
</listitem>
<listitem>
<para>
Change server parameter <link
linkend="guc-log-temp-files"><varname>log_temp_files</></link> to
use default file size units of kilobytes (Robert Haas)
</para>
<para>
Previously this setting was interpreted in bytes if no units were
specified.
</para>
</listitem>
<listitem>
<para>
Log changes of parameter values when <filename>postgresql.conf</> is
@ -895,36 +934,24 @@
settings, and is also very convenient for checking the effects of
<filename>postgresql.conf</> edits.
</para>
</listitem>
<listitem>
<para>
Add proper permissions for custom server parameters (Tom Lane)
Properly enforce superuser permissions for custom server parameters
(Tom Lane)
</para>
<para>
Custom parameters can now only be created by super-users,
but then can be modified by ordinary users if the parameter's
permissions allow it. This makes custom parameters
appropriate for security-related settings. Previously, any user
could create or modify custom parameters.
Non-superusers can no longer issue <command>ALTER
ROLE</>/<command>DATABASE SET</> for parameters that are not currently
known to the server. This allows the server to correctly check that
superuser-only parameters are only set by superusers. Previously,
the <literal>SET</> would be allowed and then ignored at session start,
making superuser-only custom parameters practically useless.
</para>
</listitem>
<listitem>
<para>
Change server parameter <link
linkend="guc-log-temp-files"><varname>log_temp_files</></link> to
use default file size units of kilobytes (Robert Haas)
</para>
<para>
Previously this setting was interpreted in bytes if no units were
specified.
</para>
</listitem>
</itemizedlist>
</sect4>
@ -957,7 +984,7 @@
<para>
Allow mixing of traditional and SQL-standard <link
linkend="SQL-LIMIT"><literal>LIMIT</>/<literal>OFFSET</></link>
syntax in the same query (Tom Lane)
syntax (Tom Lane)
</para>
</listitem>
@ -1063,29 +1090,14 @@
</itemizedlist>
<sect4>
<title><command>ALTER</></title>
<title><command>ALTER TABLE</></title>
<itemizedlist>
<listitem>
<para>
Add <link linkend="SQL-ALTERDEFAULTPRIVILEGES"><command>ALTER
DEFAULT PRIVILEGES</></link> command to control privileges
of objects created later (Petr Jelinek)
</para>
<para>
This greatly simplifies the assignment of object privileges in a
complex database application. Default privileges can be set for
tables, views, sequences, and functions. Defaults may be assigned on a
per-schema basis, or database-wide.
</para>
</listitem>
<listitem>
<para>
Implement <literal>IF EXISTS</> for <literal>DROP COLUMN</> and
<literal>DROP CONSTRAINT </> (Andres Freund)
Implement <literal>IF EXISTS</> for <literal>ALTER TABLE DROP COLUMN</>
and <literal>ALTER TABLE DROP CONSTRAINT </> (Andres Freund)
</para>
</listitem>
@ -1223,7 +1235,21 @@
and makes it easier to utilize database roles for application
data security.
</para>
</listitem>
<listitem>
<para>
Add <link linkend="SQL-ALTERDEFAULTPRIVILEGES"><command>ALTER
DEFAULT PRIVILEGES</></link> command to control privileges
of objects created later (Petr Jelinek)
</para>
<para>
This greatly simplifies the assignment of object privileges in a
complex database application. Default privileges can be set for
tables, views, sequences, and functions. Defaults may be assigned on a
per-schema basis, or database-wide.
</para>
</listitem>
<listitem>
@ -1235,7 +1261,7 @@
<para>
Formerly, any database user could read or modify any large object.
Read and write permissions can now be granted and revoked per
large object.
large object, and the ownership of large objects is tracked.
</para>
</listitem>
@ -1285,7 +1311,7 @@
</para>
<para>
Global catalogs still cannot be clustered.
Shared catalogs still cannot be clustered.
</para>
</listitem>
@ -1429,6 +1455,14 @@
</para>
</listitem>
<listitem>
<para>
By default, multicolumn indexes are now named after all their columns;
and index expression columns are now named based on their expressions
(Tom Lane)
</para>
</listitem>
<listitem>
<para>
Reindexing shared system catalogs is now fully transactional
@ -1521,7 +1555,7 @@
<listitem>
<para>
Tighten input requirements for <type>int2vector</> input (Caleb
Tighten input checking for <type>int2vector</> values (Caleb
Welton)
</para>
</listitem>
@ -1630,9 +1664,9 @@
<listitem>
<para>
Fix <function>to_char()</> to output the proper localized
numeric and monetary characters on <productname>Windows</>
(Hiroshi Inoue, Itagaki Takahir, Bruce Momjian)
Fix <function>to_char()</> to output localized numeric and monetary
strings in the correct encoding on <productname>Windows</>
(Hiroshi Inoue, Itagaki Takahiro, Bruce Momjian)
</para>
</listitem>
@ -1654,8 +1688,7 @@
<listitem>
<para>
Allow aggregate functions to use <link
linkend="syntax-aggregates"><literal>ORDER BY</></> (Andrew
Gierth)
linkend="syntax-aggregates"><literal>ORDER BY</></> (Andrew Gierth)
</para>
<para>
@ -1666,6 +1699,13 @@
</para>
</listitem>
<listitem>
<para>
Multi-argument aggregate functions can now use <literal>DISTINCT</>
(Andrew Gierth)
</para>
</listitem>
<listitem>
<para>
Add the <link
@ -1746,16 +1786,24 @@
<listitem>
<para>
Make the <link linkend="information-schema">information_schema</link>
views properly display maximum octet lengths for <type>char</> and
<type>varchar</> columns, as well as the proper precision for datetime
columns (Peter Eisentraut)
Update the <link linkend="information-schema">information_schema</link>
views to conform to SQL:2008
(Peter Eisentraut)
</para>
</listitem>
<listitem>
<para>
Make the <literal>information_schema</> views correctly display maximum
octet lengths for <type>char</> and <type>varchar</> columns (Peter
Eisentraut)
</para>
</listitem>
<listitem>
<para>
Speed up information_schema privilege views (Joachim Wieland)
Speed up <literal>information_schema</> privilege views
(Joachim Wieland)
</para>
</listitem>
@ -1889,6 +1937,23 @@
</para>
</listitem>
<listitem>
<para>
Avoid throwing an unnecessary error for an invalid record reference
(Tom Lane)
</para>
<para>
An error is now thrown only if the reference is actually fetched,
rather than whenever the enclosing expression is reached. For
example, many people have tried to do this in triggers:
<programlisting>
if TG_OP = 'INSERT' AND NEW.col1 = ... then
</programlisting>
This will now actually work as expected.
</para>
</listitem>
<listitem>
<para>
Improve PL/pgSQL's ability to handle row types with dropped columns
@ -2057,22 +2122,23 @@
<para>
<type>Bytea</> values passed into PL/Python are now represented as
binary, rather than the PostgreSQL <type>bytea</> text format. Null
bytes are now also output properly from PL/Python. <type>boolean</>
and <type>numeric</> value passing in PL/Python was also improved.
binary, rather than the PostgreSQL <type>bytea</> text format.
<type>Bytea</> values containing null bytes are now also output
properly from PL/Python. Passing of boolean, integer, and float
values was also improved.
</para>
</listitem>
<listitem>
<para>
Add <link linkend="plpython-arrays">array parameter/return
support</link> to PL/Python (Peter Eisentraut)
Support <link linkend="plpython-arrays">arrays</link> as parameters and
return values in PL/Python (Peter Eisentraut)
</para>
</listitem>
<listitem>
<para>
Improve mapping of domains to Python base types in PL/Python (Peter Eisentraut)
Improve mapping of SQL domains to Python types (Peter Eisentraut)
</para>
</listitem>
@ -2330,10 +2396,10 @@
</para>
<para>
Previously the <application>pg_ctl</> process could have been mistakenly
identified as a running <application>postmaster</> based on a stale
<application>postmaster</> lock file, resulting in a transient failure
to start the database.
Previously, <application>pg_ctl</>'s parent process could have been
mistakenly identified as a running <application>postmaster</> based on
a stale <application>postmaster</> lock file, resulting in a transient
failure to start the database.
</para>
</listitem>
@ -2417,6 +2483,14 @@
</para>
</listitem>
<listitem>
<para>
Avoid extra system calls to block and unblock <literal>SIGPIPE</>
in <application>libpq</>, on platforms that offer alternative methods
(Jeremy Kerr)
</para>
</listitem>
<listitem>
<para>
When a <link linkend="libpq-pgpass"><filename>.pgpass</></link>-supplied
@ -2517,20 +2591,20 @@
<listitem>
<para>
Add <application>ecpg</> out-of-scope cursor support in native mode
Add out-of-scope cursor support in <application>ecpg</>'s native mode
(Boszormenyi Zoltan)
</para>
<para>
This allows <command>DECLARE</> to use variables that are not in
scope when <command>OPEN</> is called. This facility already existed
in <application>ecpg</> Informix-compatibility mode.
in <application>ecpg</>'s Informix-compatibility mode.
</para>
</listitem>
<listitem>
<para>
Allow dynamic <application>ecpg</> cursor names (Boszormenyi Zoltan)
Allow dynamic cursor names in <application>ecpg</> (Boszormenyi Zoltan)
</para>
</listitem>
@ -2601,15 +2675,15 @@
<para>
These are similar to the existing <literal>all</>, <literal>install</>,
and <literal>installcheck</> targets, but they build <acronym>HTML</>
documentation, build and test <filename>contrib</>, and test
server-side languages and <application>ecpg</>.
and <literal>installcheck</> targets, but they also build
<acronym>HTML</> documentation, build and test <filename>contrib</>,
and test server-side languages and <application>ecpg</>.
</para>
</listitem>
<listitem>
<para>
Add data and documentation location control to <link
Add data and documentation installation location control to <link
linkend="xfunc-c-pgxs"><acronym>PGXS</></link> Makefiles
(Mark Cave-Ayland)
</para>
@ -2617,8 +2691,9 @@
<listitem>
<para>
Add a Makefile rule to build documentation as a single text file
(Bruce Momjian)
Add Makefile rules to build documentation as a single <acronym>HTML</>
file or as a single plain-text file
(Peter Eisentraut, Bruce Momjian)
</para>
</listitem>
@ -2652,13 +2727,6 @@
</para>
</listitem>
<listitem>
<para>
Support multiprocessor compilation using <productname>Microsoft Visual
C</> (Magnus Hagander)
</para>
</listitem>
</itemizedlist>
</sect4>
@ -2757,14 +2825,39 @@
<listitem>
<para>
Improve the ability to translate <application>psql</> strings
Automatically generate the initial contents of
<structname>pg_attribute</> for <quote>bootstrapped</> catalogs
(John Naylor)
</para>
<para>
This greatly simplifies changes to these catalogs.
</para>
</listitem>
<listitem>
<para>
Split the processing of
<command>INSERT</>/<command>UPDATE</>/<command>DELETE</> operations out
of <filename>execMain.c</> (Marko Tiikkaja)
</para>
<para>
Updates are now executed in a separate ModifyTable node. This change is
necessary infrastructure for future improvements.
</para>
</listitem>
<listitem>
<para>
Simplify translation of <application>psql</>'s SQL help text
(Peter Eisentraut)
</para>
</listitem>
<listitem>
<para>
Reduce the length of some file names so that all file paths in the
Reduce the lengths of some file names so that all file paths in the
distribution tarball are less than 100 characters (Tom Lane)
</para>
@ -2803,15 +2896,20 @@
<listitem>
<para>
Restructure the <acronym>HTML</> documentation build
<filename>Makefile</> rules (Peter Eisentraut)
Restructure the <acronym>HTML</> documentation
<filename>Makefile</> rules to make their dependency checks work
correctly, avoiding unnecessary rebuilds (Peter Eisentraut)
</para>
</listitem>
<listitem>
<para>
Use <productname>DocBook</> <acronym>XSL</> stylesheets for man page
building (Peter Eisentraut)
building, rather than <productname>Docbook2X</> (Peter Eisentraut)
</para>
<para>
This changes the set of tools needed to build the man pages.
</para>
</listitem>
@ -2823,7 +2921,7 @@
<listitem>
<para>
Improve error context support in PL/Perl (Alexey Klyukin)
Improve error context reports in PL/Perl (Alexey Klyukin)
</para>
</listitem>
@ -2906,6 +3004,12 @@
Restructure use of <literal>LDFLAGS</> to be more consistent
across platforms (Tom Lane)
</para>
<para>
<literal>LDFLAGS</> is now used for linking both executables and shared
libraries, and we add on <literal>LDFLAGS_EX</> when linking
executables, or <literal>LDFLAGS_SL</> when linking shared libraries.
</para>
</listitem>
</itemizedlist>
@ -2919,8 +3023,8 @@
<listitem>
<para>
Simplify use of <productname>C++</> functions in backend code (Kurt
Harriman, Peter Eisentraut)
Make backend header files safe to include in <productname>C++</>
(Kurt Harriman, Peter Eisentraut)
</para>
<para>
@ -2942,10 +3046,23 @@
</para>
</listitem>
<listitem>
<para>
Change calling convention for <function>SearchSysCache()</> and related
functions to avoid hard-wiring the maximum number of cache keys
(Robert Haas)
</para>
<para>
Existing calls will still work for the moment, but can be expected to
break in 9.1 or later if not converted.
</para>
</listitem>
<listitem>
<para>
Require calls of <function>fastgetattr()</> and
<function>heap_getattr()</> backend macros to use a non-NULL fourth
<function>heap_getattr()</> backend macros to provide a non-NULL fourth
argument (Robert Haas)
</para>
</listitem>
@ -2961,8 +3078,8 @@
<listitem>
<para>
Add parser hooks to access column and parameter references in
queries (Tom Lane)
Add parser hooks for processing ColumnRef and ParamRef nodes
(Tom Lane)
</para>
</listitem>
@ -3085,7 +3202,7 @@
</para>
<para>
This filter dictionary removes accents from letters, which
This filtering dictionary removes accents from letters, which
makes full-text searches over multiple languages much easier.
</para>
</listitem>

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