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Make the CHECKPOINT reference page more clear.

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Josh Kupershmidt, reviewed by Fujii Masao
This commit is contained in:
Robert Haas 2011-10-18 20:13:27 -04:00
parent e27f52f3a1
commit c53d3a9ee1
1 changed files with 14 additions and 14 deletions
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doc/src/sgml/ref/checkpoint.sgml
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@ -25,31 +25,31 @@ CHECKPOINT
<refsect1>
<title>Description</title>
<para>
Write-Ahead Logging (WAL) puts a checkpoint in the transaction log
every so often. (To adjust the automatic checkpoint interval, see
the run-time configuration options <xref linkend="guc-checkpoint-segments">
and <xref linkend="guc-checkpoint-timeout">.) The
<command>CHECKPOINT</command> command forces an immediate
checkpoint when the command is issued, without waiting for a
scheduled checkpoint.
</para>
<para>
A checkpoint is a point in the transaction log sequence at which
all data files have been updated to reflect the information in the
log. All data files will be flushed to disk. Refer to
<xref linkend="wal"> for more information about the WAL system.
<xref linkend="wal-configuration"> for more details about what happens
during a checkpoint.
</para>
<para>
The <command>CHECKPOINT</command> command forces an immediate
checkpoint when the command is issued, without waiting for a
regular checkpoint scheduled by the system (controlled by the settings in
<xref linkend="runtime-config-wal-checkpoints">).
<command>CHECKPOINT</command> is not intended for use during normal
operation.
</para>
<para>
If executed during recovery, the <command>CHECKPOINT</command> command
will force a restartpoint rather than writing a new checkpoint.
will force a restartpoint (see <xref linkend="wal-configuration">)
rather than writing a new checkpoint.
</para>
<para>
Only superusers can call <command>CHECKPOINT</command>. The command is
not intended for use during normal operation.
Only superusers can call <command>CHECKPOINT</command>.
</para>
</refsect1>