<title>Checkpoints</title>

<variablelist>

<varlistentry id="guc-max-wal-size" xreflabel="max_wal_size">

<term><varname>max_wal_size</varname> (<type>integer</type>)

<indexterm>

<primary><varname>max_wal_size</> configuration parameter</primary>

</indexterm>

</term>

<listitem>

<para>

Maximum size to let the WAL grow to between automatic WAL

checkpoints. This is a soft limit; WAL size can exceed

<varname>max_wal_size</> under special circumstances, like

under heavy load, a failing <varname>archive_command</>, or a high

<varname>wal_keep_segments</> setting. The default is 1 GB.

Increasing this parameter can increase the amount of time needed for

crash recovery.

This parameter can only be set in the <filename>postgresql.conf</>

file or on the server command line.

</para>

</listitem>

</varlistentry>

<varlistentry id="guc-checkpoint-timeout" xreflabel="checkpoint_timeout">

<term><varname>checkpoint_timeout</varname> (<type>integer</type>)

<indexterm>

</listitem>

</varlistentry>

<varlistentry id="guc-max-wal-size" xreflabel="max_wal_size">

<term><varname>max_wal_size</varname> (<type>integer</type>)

<indexterm>

<primary><varname>max_wal_size</> configuration parameter</primary>

</indexterm>

</term>

<listitem>

<para>

Maximum size to let the WAL grow to between automatic WAL

checkpoints. This is a soft limit; WAL size can exceed

<varname>max_wal_size</> under special circumstances, like

under heavy load, a failing <varname>archive_command</>, or a high

<varname>wal_keep_segments</> setting. The default is 1 GB.

Increasing this parameter can increase the amount of time needed for

crash recovery.

This parameter can only be set in the <filename>postgresql.conf</>

file or on the server command line.

</para>

</listitem>

</varlistentry>

<varlistentry id="guc-min-wal-size" xreflabel="min_wal_size">

<term><varname>min_wal_size</varname> (<type>integer</type>)

<indexterm>