-<!-- $PostgreSQL: pgsql/doc/src/sgml/release-9.0.sgml,v 2.39.2.7 2010/08/23 02:43:35 tgl Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/release-9.0.sgml,v 2.39.2.8 2010/08/24 14:46:35 momjian Exp $ -->
<sect1 id="release-9-0">
<title>Release 9.0</title>
<listitem>
<para>
Easier database object permissions management. <link
- 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.
+ 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.
</para>
</listitem>
<listitem>
<para>
- Broadly enhanced stored procedure support.
- The <link linkend="SQL-DO"><command>DO</></link> statement permits
- execution of <quote>anonymous</> code blocks, without having to
- define a function first. Functions can now be called using named
- parameters. PL/pgSQL is now installed by default, and PL/Perl and
- PL/Python have been enhanced in several ways, including support for
- Python3.
+ Add support for compiling on <link
+ linkend="install-win32-full">64-bit
+ <productname>Windows</></link> and running in 64-bit
+ mode.
</para>
</listitem>
<listitem>
<para>
- Full support for <link linkend="install-win32">64-bit
- <productname>Windows</></link>.
+ 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.
</para>
</listitem>
<listitem>
<para>
- 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.
+ 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.
</para>
</listitem>
<listitem>
<para>
- New trigger features, including
- SQL-standard-compliant <link
- linkend="SQL-CREATETRIGGER">per-column triggers</link> and
+ Triggers now support two new features,
+ SQL-compliant <link
+ linkend="SQL-CREATETRIGGER">per-column triggers</link>, and
conditional trigger execution.
</para>
</listitem>
<listitem>
<para>
- <link linkend="ddl-constraints-exclusion">Exclusion constraints</link>.
- These provide a generalized version of unique constraints, allowing
- enforcement of complex conditions.
+ 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.
</para>
</listitem>
<listitem>
<para>
- 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.
+ 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.
</para>
</listitem>
<listitem>
<para>
- 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.
+ Add <link linkend="pgupgrade"><filename>/contrib/pg_upgrade</></link>
+ to support in-place upgrades from 8.3 or 8.4 to 9.0.
</para>
</listitem>
<listitem>
<para>
- 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.
+ 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).
</para>
</listitem>
<listitem>
<para>
- New contrib module
- <link linkend="pgupgrade"><filename>pg_upgrade</></link>
- to support in-place upgrades from 8.3 or 8.4 to 9.0.
+ <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.
</para>
</listitem>
<listitem>
<para>
- 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).
+ 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.
</para>
</listitem>
<listitem>
<para>
- <link linkend="SQL-EXPLAIN "><command>EXPLAIN</></link> enhancements.
- The output is now available in JSON, XML, or YAML format, and includes
+ <link linkend="using-explain"><command>EXPLAIN</command></link>
+ plans are now available in JSON, XML and YAML format, and include
buffer utilization and other data not previously available.
</para>
</listitem>
<listitem>
<para>
- <link linkend="hstore"><filename>hstore</></link> improvements,
- including new functions and greater data capacity.
+ 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.
</para>
</listitem>
<listitem>
<para>
- Allow aggregate functions to use <literal>ORDER BY</> (Andrew
+ Allow aggregate functions to use <link
+ linkend="syntax-aggregates"><literal>ORDER BY</></> (Andrew
Gierth)
</para>
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