<listitem>

<para>

Record and check the collation of each <link

Record and check the collationversionof each <link

linkend="sql-createdatabase">database</link> (Peter Eisentraut)

</para>

<para>

This is designed to detect collation

This is designed to detect collation version

mismatches to avoid data corruption. Function

<function>pg_database_collation_actual_version()</function>

reports the underlying operating system collation version, and

<command>ALTER DATABASE ... REFRESH</command> sets the database

to match the operating system collation version. DETAILS?

to match the operating system collation version.

</para>

</listitem>

</para>

<para>

Previously, <acronym>ICU</acronym> collations could only be

specified in <link linkend="sql-createcollation"><command>CREATE

COLLATION</command></link> and used with the

Previously, only <application>libc</application>-based

collations could be set at the cluster and database levels.

<acronym>ICU</acronym> collations were previously limited

to <link linkend="sql-createcollation"><command>CREATE

COLLATION</command></link> and referenced by the

<literal>COLLATE</literal> clause.

</para>

</listitem>