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<sect1 id="release-9-5">

Allow the recording of transaction

commit timestamps when <acronym>GUC</> <link

linkend="guc-track-commit-timestamp"><varname>track_commit_timestamp</></>

is enabled (&Aacute;lvaro Herrera, PetrJelinek)

is enabled (&Aacute;lvaro Herrera, PetrJel&iacute;nek)

</para>

<para>

Add <link linkend="recovery-config"><filename>recovery.conf</></>

parameter <link

linkend="recovery-target-action"><varname>recovery_target_action</></>

to control post-recovery activity (PetrJelinek)

to control post-recovery activity (PetrPetr Jel&iacute;nek)

</para>

<para>

<para>

Add <link linkend="SQL-SELECT"><command>SELECT</></> option

<literal>TABLESAMPLE</> to return a subset of a table (Petr

Jelinek)

Petr Jel&iacute;nek)

</para>

</listitem>

linkend="functions-json-processing-table"><function>jsonb_set()</></>

and <link

linkend="functions-json-processing-table"><function>jsonb_pretty</></>

(Dmitry Dolgov, Andrew Dunstan, PetrJelinek)

(Dmitry Dolgov, Andrew Dunstan, PetrJel&iacute;nek)

</para>

</listitem>

Add <link

linkend="functions-math-func-table"><function>width_bucket()</></>

which supports any sortable data type and non-uniform bucket widths

(PetrJelinek)

(PetrJel&iacute;nek)

</para>

</listitem>

Add <filename>contrib</> modules <link

linkend="tsm-system-rows"><application>tsm_system_rows</></> and

<link linkend="tsm-system-time"><application>tsm_system_time</></>

to allow additional table sampling methods (PetrJelinek)

to allow additional table sampling methods (PetrJel&iacute;nek)

</para>

</listitem>