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-rw-r--r--doc/src/sgml/config.sgml35
1 files changed, 35 insertions, 0 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index d383de25128..2166b99fc4e 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -3590,6 +3590,41 @@ restore_command = 'copy "C:\\server\\archivedir\\%f" "%p"' # Windows
</listitem>
</varlistentry>
+ <varlistentry id="guc-wal-init-zero" xreflabel="wal_init_zero">
+ <term><varname>wal_init_zero</varname> (<type>boolean</type>)
+ <indexterm>
+ <primary><varname>wal_init_zero</varname> configuration parameter</primary>
+ </indexterm>
+ </term>
+ <listitem>
+ <para>
+ If set to <literal>on</literal> (the default), this option causes new
+ WAL files to be filled with zeroes. On some filesystems, this ensures
+ that space is allocated before we need to write WAL records. However,
+ <firstterm>Copy-On-Write</firstterm> (COW) filesystems may not benefit
+ from this technique, so the option is given to skip the unnecessary
+ work. If set to <literal>off</literal>, only the final byte is written
+ when the file is created so that it has the expected size.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry id="guc-wal-recycle" xreflabel="wal_recycle">
+ <term><varname>wal_recycle</varname> (<type>boolean</type>)
+ <indexterm>
+ <primary><varname>wal_recycle</varname> configuration parameter</primary>
+ </indexterm>
+ </term>
+ <listitem>
+ <para>
+ If set to <literal>on</literal> (the default), this option causes WAL
+ files to be recycled by renaming them, avoiding the need to create new
+ ones. On COW filesystems, it may be faster to create new ones, so the
+ option is given to disable this behavior.
+ </para>
+ </listitem>
+ </varlistentry>
+
<varlistentry id="guc-wal-sender-timeout" xreflabel="wal_sender_timeout">
<term><varname>wal_sender_timeout</varname> (<type>integer</type>)
<indexterm>