<para>
        Specifies the maximum amount of memory to be used by logical decoding,
        before some of the decoded changes are written to local disk. This
        limits the amount of memory used by logical streaming replication
        connections. It defaults to 64 megabytes (<literal>64MB</literal>).
        Since each replication connection only uses a single buffer of this size,
        and an installation normally doesn't have many such connections
        concurrently (as limited by <varname>max_wal_senders</varname>), it's
        safe to set this value significantly higher than <varname>work_mem</varname>,
        reducing the amount of decoded changes written to disk.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="guc-commit-timestamp-buffers" xreflabel="commit_timestamp_buffers">
      <term><varname>commit_timestamp_buffers</varname> (<type>integer</type>)
      <indexterm>
       <primary><varname>commit_timestamp_buffers</varname> configuration parameter</primary>
      </indexterm>
      </term>
      <listitem>
       <para>
        Specifies the amount of memory to use to cache the contents of
        <literal>pg_commit_ts</literal> (see
        <xref linkend="pgdata-contents-table"/>).
        If this value is specified without units, it is taken as blocks,
        that is <symbol>BLCKSZ</symbol> bytes, typically 8kB.
        The default value is <literal>0</literal>, which requests
        <varname>shared_buffers</varname>/512 up to 1024 blocks,
        but not fewer than 16 blocks.
        This parameter can only be set at server start.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="guc-multixact-member-buffers" xreflabel="multixact_member_buffers">
      <term><varname>multixact_member_buffers</varname> (<type>integer</type>)
      <indexterm>
       <primary><varname>multixact_member_buffers</varname> configuration parameter</primary>
      </indexterm>
      </term>
      <listitem>
       <para>
        Specifies the amount of shared memory to use to cache the contents
        of <literal>pg_multixact/members</literal> (see
        <xref linkend="pgdata-contents-table"/>).
        If this value is specified without units, it is taken as blocks,
        that is <symbol>BLCKSZ</symbol> bytes, typically 8kB.
        The default value is <literal>32</literal>.
        This parameter can only be set at server start.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="guc-multixact-offset-buffers" xreflabel="multixact_offset_buffers">
      <term><varname>multixact_offset_buffers</varname> (<type>integer</type>)
      <indexterm>
       <primary><varname>multixact_offset_buffers</varname> configuration parameter</primary>
      </indexterm>
      </term>
      <listitem>
       <para>
        Specifies the amount of shared memory to use to cache the contents
        of <literal>pg_multixact/offsets</literal> (see
        <xref linkend="pgdata-contents-table"/>).
        If this value is specified without units, it is taken as blocks,
        that is <symbol>BLCKSZ</symbol> bytes, typically 8kB.
        The default value is <literal>16</literal>.
        This parameter can only be set at server start.
       </para>
      </listitem>
     </varlistentry>

     <varlistentry id="guc-notify-buffers" xreflabel="notify_buffers">
      <term><varname>notify_buffers</varname> (<type>integer</type>)
      <indexterm>
       <primary><varname>notify_buffers</varname> configuration parameter</primary>
      </indexterm>
      </term>
      <listitem>
       <para>
        Specifies the amount of shared memory to use to cache the contents
        of <literal>pg_notify</literal> (see
        <xref linkend="pgdata-contents-table"/>).
        If this value is specified without units, it is taken as blocks,
        that is <symbol>BLCKSZ</symbol> bytes, typically 8kB.
        The default value is <literal>16</literal>.