diff options
Diffstat (limited to 'doc/src/sgml/config.sgml')
| -rw-r--r-- | doc/src/sgml/config.sgml | 35 |
1 files changed, 0 insertions, 35 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index 091a79d4f3..b56f073a91 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -4614,41 +4614,6 @@ ANY <replaceable class="parameter">num_sync</replaceable> ( <replaceable class=" </listitem> </varlistentry> - <varlistentry id="guc-vacuum-defer-cleanup-age" xreflabel="vacuum_defer_cleanup_age"> - <term><varname>vacuum_defer_cleanup_age</varname> (<type>integer</type>) - <indexterm> - <primary><varname>vacuum_defer_cleanup_age</varname> configuration parameter</primary> - </indexterm> - </term> - <listitem> - <para> - Specifies the number of transactions by which <command>VACUUM</command> and - <link linkend="storage-hot"><acronym>HOT</acronym> updates</link> - will defer cleanup of dead row versions. The - default is zero transactions, meaning that dead row versions can be - removed as soon as possible, that is, as soon as they are no longer - visible to any open transaction. You may wish to set this to a - non-zero value on a primary server that is supporting hot standby - servers, as described in <xref linkend="hot-standby"/>. This allows - more time for queries on the standby to complete without incurring - conflicts due to early cleanup of rows. However, since the value - is measured in terms of number of write transactions occurring on the - primary server, it is difficult to predict just how much additional - grace time will be made available to standby queries. - This parameter can only be set in the <filename>postgresql.conf</filename> - file or on the server command line. - </para> - <para> - You should also consider setting <varname>hot_standby_feedback</varname> - on standby server(s) as an alternative to using this parameter. - </para> - <para> - This does not prevent cleanup of dead rows which have reached the age - specified by <varname>old_snapshot_threshold</varname>. - </para> - </listitem> - </varlistentry> - </variablelist> </sect2> |