wal_keep_size

doc html

<p>
        Specifies the minimum size of past WAL files kept in the
        <code class="filename">pg_wal</code>
        directory, in case a standby server needs to fetch them for streaming
        replication. If a standby
        server connected to the sending server falls behind by more than
        <code class="varname">wal_keep_size</code> megabytes, the sending server might
        remove a WAL segment still needed by the standby, in which case the
        replication connection will be terminated.  Downstream connections
        will also eventually fail as a result.  (However, the standby
        server can recover by fetching the segment from archive, if WAL
        archiving is in use.)
       </p><p>
        This sets only the minimum size of segments retained in
        <code class="filename">pg_wal</code>; the system might need to retain more segments
        for WAL archival or to recover from a checkpoint. If
        <code class="varname">wal_keep_size</code> is zero (the default), the system
        doesn't keep any extra segments for standby purposes, so the number
        of old WAL segments available to standby servers is a function of
        the location of the previous checkpoint and status of WAL
        archiving.
        If this value is specified without units, it is taken as megabytes.
        This parameter can only be set in the
        <code class="filename">postgresql.conf</code> file or on the server command line.
       </p>

documentation revision

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