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
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
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
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
* 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)
* 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
* 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,
+ * Add new columns in pg_settings: context, type, source, min_val,
max_val (Joe)
* New pg_hba.conf 'hostnossl' to prevent SSL connections (Jon
Jensen)
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)
* 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
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
* 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)
(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)
* 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)
* 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
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)
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)
* 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)
_________________________________________________________________
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
<!--
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+$Header: /cvsroot/pgsql/doc/src/sgml/release.sgml,v 1.216 2003/10/22 17:27:14 momjian Exp $
-->
<appendix id="release">
<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.
- </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.
-
-CDATA means the content is "SGML-free", so you can write without
-worries about funny characters.
--->
-<literallayout><![CDATA[
-]]></literallayout>
-
<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>
+
+<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> IPv6</glossterm>
<glossdef><para> Full support for IPv6 connections and IPv6 address
<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>
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>
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>
<listitem><para>Preserve free space information between postmaster restarts (Tom)</para></listitem>
<listitem><para>Set proper schema permissions in initdb (Peter)</para></listitem>
<listitem><para>Add start time to pg_stat_activity (Neil)</para></listitem>
-<listitem><para>New code to detect corrupt disk pages; erase with zero_damaged_pages (Tom)</para></listitem>
+<listitem><para>New code to detect corrupt disk pages; erase with zero_damaged_pages (Tom)</para></listitem>
<listitem><para>New client/server protocol: faster, no username length limit, allow
clean exit from COPY (Tom)</para></listitem>
<listitem><para>Add transaction status, tableid, columnid to backend protocol (Tom)</para></listitem>
<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>
<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>
<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>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>
<listitem><para>Remove geqo_random_seed server parameter (Tom)</para></listitem>
</itemizedlist></sect3>
<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
- beginning/end of cursor, per SQL spec (Bruce)</para></listitem>
+<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>
<listitem><para>Implement SQL92-compatible FIRST, LAST, ABSOLUTE n, RELATIVE n options
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>
<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>
<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>
<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>
<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>
<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>
<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>
<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>
<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>
projects / postgresql / commitdiff