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Update 9.1 release notes to reflect commits through today.
Also do another pass of copy-editing.
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‎doc/src/sgml/release-9.1.sgml

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@@ -9,33 +9,25 @@
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<simpara>2011-??-??</simpara>
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</note>
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<para>CURRENT AS OF 2011-07-07</para>
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<para>CURRENT AS OF 2011-08-17</para>
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<sect2>
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<title>Overview</title>
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<para>
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This release shows <productname>PostgreSQL</> moving beyond the
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traditional relational feature set with new, ground-breaking
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traditional relational-database feature set with new, ground-breaking
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functionality that is unique to <productname>PostgreSQL</>.
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Additionally, this release improves streaming replication by adding
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a synchronous option and monitoring improvements. Major enhancements
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include:
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The streaming replication feature introduced in release 9.0 is
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significantly enhanced by adding a synchronous-replication option,
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streaming backups, and monitoring improvements.
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Major enhancements include:
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</para>
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<itemizedlist>
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<!-- This list duplicates items below, but without authors or details-->
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<listitem>
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<para>
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Support unlogged tables using the <link
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linkend="SQL-CREATETABLE-description"><literal>UNLOGGED</></link>
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option in <link linkend="SQL-CREATETABLE"><command>CREATE
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TABLE</></link>
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</para>
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</listitem>
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<listitem>
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<para>
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Allow <link linkend="synchronous-replication">synchronous
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<listitem>
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<para>
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Add a <link linkend="SQL-SECURITY-LABEL"><command>SECURITY
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LABEL</></link> command
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Add <link linkend="extend-extensions">extensions</link> which
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simplify packaging of additions to <productname>PostgreSQL</>
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</para>
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</listitem>
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<listitem>
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<para>
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Add a true <link
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linkend="xact-serializable">serializable</link> isolation
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level
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linkend="xact-serializable">serializable isolation level</link>
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</para>
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</listitem>
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<listitem>
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<para>
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Support unlogged tables using the <literal>UNLOGGED</>
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option in <link linkend="SQL-CREATETABLE"><command>CREATE
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TABLE</></link>
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</para>
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</listitem>
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@@ -89,8 +88,9 @@
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<listitem>
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<para>
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Add <link linkend="extend-extensions">extensions</link> which
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simplify packaging of additions to <productname>PostgreSQL</>
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Add a <link linkend="SQL-SECURITY-LABEL"><command>SECURITY
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LABEL</></link> command and support for
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<link linkend="sepgsql"><acronym>SELinux</> permissions control</link>
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</para>
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</listitem>
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@@ -146,6 +146,17 @@
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strings are the proper way to embed backslash escapes in strings and are
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unaffected by this change.
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</para>
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<warning>
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<para>
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This change can break applications that are not expecting it and
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do their own string escaping according to the old rules. The
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consequences could be as severe as introducing SQL-injection security
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holes. Be sure to test applications that are exposed to untrusted
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input, to ensure that they correctly handle single quotes and
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backslashes in text strings.
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</para>
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</warning>
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</listitem>
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</itemizedlist>
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<listitem>
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<para>
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Treat <application>ECPG</> cursor names as case-insensitive (Zoltan Boszormenyi)
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Treat <application>ECPG</> cursor names as case-insensitive
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(Zoltan Boszormenyi)
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</para>
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</listitem>
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<sect2>
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<title>Changes</title>
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<para>
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Version 9.1 has ...
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</para>
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<para>
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Below you will find a detailed account of the changes between
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<productname>PostgreSQL</productname> 9.1 and the previous major
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release.
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</para>
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<sect3>
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<title>Server</title>
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<listitem>
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<para>
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Support unlogged tables using the <link
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linkend="SQL-CREATETABLE-description"><literal>UNLOGGED</></link>
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Support unlogged tables using the <literal>UNLOGGED</>
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option in <link linkend="SQL-CREATETABLE"><command>CREATE
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TABLE</></link> (Robert Haas)
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</para>
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<listitem>
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<para>
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Merge duplicate fsync requests on busy systems (Robert Haas,
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Greg Smith)
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Merge duplicate fsync requests (Robert Haas, Greg Smith)
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</para>
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<para>
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This greatly improves performance under heavy write loads.
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</para>
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</listitem>
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</para>
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<para>
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The old term is still accepted for backward compatibility.
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The old term is still accepted for backward compatibility, but since
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the two methods are fundamentally different, it seemed better to adopt
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different names for them.
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</para>
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</listitem>
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</para>
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</listitem>
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<listitem>
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<para>
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Reduce the default maximum line length for <application>syslog</>
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logging to 900 bytes plus prefixes (Noah Misch)
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</para>
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<para>
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This avoids truncation of long log lines on syslog implementations
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that have a 1KB length limit, rather than the more common 2KB.
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</para>
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</listitem>
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</itemizedlist>
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</sect4>
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</para>
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<para>
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This allows external cluster management software to take control
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of whether servers restart or not.
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This allows external cluster management software to control
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whether the database server restarts or not.
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</para>
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</listitem>
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<listitem>
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<para>
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Add a true <link
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linkend="xact-serializable">serializable</link> isolation
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level (Kevin Grittner, Dan Ports)
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linkend="xact-serializable">serializable isolation level</link>
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(Kevin Grittner, Dan Ports)
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</para>
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<para>
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<listitem>
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<para>
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Prevent <link linkend="autovacuum">autovacuum</link> from
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waiting if it cannot acquire a lock (Robert Haas)
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waiting if it cannot acquire a table lock (Robert Haas)
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</para>
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<para>
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It will try to vacuum later.
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It will try to vacuum that table later.
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</para>
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</listitem>
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<para>
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This allows <acronym>GiST</> indexes to quickly return the
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<replaceable>N</> closest values in a query with <literal>LIMIT</>.
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For example
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<programlisting><![CDATA[
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SELECT * FROM places ORDER BY location <-> point '(101,456)' LIMIT 10;
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]]>
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</programlisting>
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finds the ten places closest to a given target point.
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</para>
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</listitem>
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<listitem>
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<para>
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Add <link linkend="plpgsql-foreach-array"><command>FOREACH IN
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ARRAY</></link> to <link linkend="plpgsql">PL/pgSQL</link>
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ARRAY</></link> to PL/pgSQL
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(Pavel Stehule)
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</para>
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<listitem>
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<para>
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Add PL/Python explicit subtransactions (Jan Urbanski)
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Add explicit subtransactions to PL/Python (Jan Urbanski)
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</para>
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</listitem>
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<para>
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Add <option>S</> (<quote>system</>) option to <application>psql</>'s
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Add the <option>S</> (<quote>system</>) option to <application>psql</>'s
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<literal>\dn</> (list schemas) command (Tom Lane)
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</para>
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<listitem>
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<para>
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Add a libpq connection option <literal>client_encoding</>
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Add a libpq connection option <link
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linkend="libpq-connect-client-encoding"><literal>client_encoding</></link>
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which behaves like the <envar>PGCLIENTENCODING</> environment
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variable (Heikki Linnakangas)
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</para>
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<listitem>
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<para>
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Allow libpq database clients to
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check the user name of the server process using <link
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Allow libpq-using clients to
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check the user name of the server process
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when connecting via Unix-domain sockets, with the new <link
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linkend="libpq-connect-requirepeer"><literal>requirepeer</></link>
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when connecting via Unix-domain sockets
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connection option
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(Peter Eisentraut)
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</para>
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<listitem>
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<para>
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Allow ECPG to accept dynamic cursor names even in
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<literal>WHERE CURRENT OF</literal> clauses
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Allow ECPG to accept dynamic cursor names even in
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<literal>WHERE CURRENT OF</literal> clauses
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(Zoltan Boszormenyi)
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</para>
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</listitem>
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<listitem>
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<para>
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Make <application>ecpglib</> write <type>double</> values with a
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precision of 15 digits, not 14 as formerly (Akira Kurosawa)
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</para>
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</listitem>
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<listitem>
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<para>
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Add latches to the source code to wait for events (Heikki
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Linnakangas)
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Add latches to the source code to support waiting for events (Heikki
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Linnakangas)
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</para>
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</listitem>
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<listitem>
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<para>
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Add nearest-neighbor support to <link
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Add nearest-neighbor search support to <link
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linkend="pgtrgm"><filename>contrib/pg_trgm</></link> and <link
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linkend="btree-gist"><filename>contrib/btree_gist</></link>
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(Teodor Sigaev)
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<listitem>
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<para>
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Add <link linkend="sepgsql"><filename>contrib/sepgsql</></link>
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to interface permission checks with <acronym>SE</>-Linux (KaiGai Kohei)
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to interface permission checks with <acronym>SELinux</> (KaiGai Kohei)
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</para>
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<para>
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<listitem>
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<para>
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Add <link linkend="dummy-seclabel">dummy_seclabel</link>
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Add <link linkend="dummy-seclabel"><filename>dummy_seclabel</></link>
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contrib module (KaiGai Kohei)
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</para>
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<listitem>
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<para>
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Extensive <link linkend="ecpg"><application>ECPG</> documentation</link>
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improvements (Satoshi Nagayasu)
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Extensive <link linkend="ecpg"><application>ECPG</></link>
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documentation improvements (Satoshi Nagayasu)
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</para>
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</listitem>
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<listitem>
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<para>
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Merge docs for <command>CREATE CONSTRAINT TRIGGER</> and <link
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Merge documentation for <command>CREATE CONSTRAINT TRIGGER</> and <link
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linkend="SQL-CREATETRIGGER"><command>CREATE TRIGGER</></link>
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(Alvaro Herrera)
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</para>

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