</para>
<para>
- Version 9.1 contains a number of changes that ...
- Observe the following incompatibilities:
+ Version 9.1 contains a number of changes that may affect compatibility
+ with previous releases. Observe the following incompatibilities:
</para>
<sect3>
</para>
</listitem>
+ <listitem>
+ <para>
+ Increase the maximum values for <xref linkend="guc-deadlock-timeout">,
+ <xref linkend="guc-max-standby-archive-delay">,
+ <xref linkend="guc-max-standby-streaming-delay">,
+ <xref linkend="guc-log-min-duration-statement">, and
+ <xref linkend="guc-log-autovacuum-min-duration">.
+ </para>
+
+ <para>
+ The maximum value for each of these parameters was previously
+ only about 35 minutes. Much larger values are now allowed.
+ </para>
+ </listitem>
+
</itemizedlist>
</sect4>
</para>
</listitem>
+ <listitem>
+ <para>
+ <link linkend="auth-ident"><literal>ident</literal></link>
+ authentication over local sockets is now known as
+ <link linkend="auth-peer"><literal>peer</literal></link>
+ (Magnus Hagander)
+ </para>
+
+ <para>
+ The old term is still accepted for backward compatibility.
+ </para>
+ </listitem>
+
</itemizedlist>
<sect4>
</para>
</listitem>
+ <listitem>
+ <para>
+ Fix possible "tuple concurrently updated" error when two server
+ backends attempted to add an inheritance parent to the same
+ table at the same time (Robert Haas)
+ </para>
+
+ <para>
+ <xref linkend="sql-altertable"> now takes a stronger lock on the
+ parent table, so that both children do not try to update it
+ simultaneously.
+ </para>
+ </listitem>
+
</itemizedlist>
</sect4>
</para>
<para>
- This function is used to obtain comments on objects.
+ This function is used to obtain a human-readable string describing an
+ object, based on the <link linkend="catalog-pg-class"><structname>pg_class</structname></link> OID, object OID, and sub-object OID. It can be used to
+ help interpret the contents of <link linkend="catalog-pg-depend"><structname>pg_depend</structname></link>.
</para>
</listitem>
<listitem>
<para>
- Additional tab completion of <application>psql</> variables (Pavel
- Stehule)
- </para>
- </listitem>
-
- <listitem>
- <para>
- More <application>psql</> tab completion support (Itagaki
- Takahiro)
+ Additional tab completion support (Itagaki Takahiro, Pavel Stehule,
+ Andrey Popp, Christoph Berg, David Fetter, Josh Kupershmidt)
</para>
</listitem>