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Clarify wal_sync_method options in documentation.

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This commit is contained in:
Bruce Momjian 2005-08-09 04:50:44 +00:00
parent 3117afa75d
commit 487b757b7a
2 changed files with 34 additions and 9 deletions
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39
doc/src/sgml/runtime.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.341 2005/07/30 17:15:35 momjian Exp $
$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.342 2005/08/09 04:50:43 momjian Exp $
-->
<chapter Id="runtime">
@ -1724,13 +1724,38 @@ SET ENABLE_SEQSCAN TO OFF;
<listitem>
<para>
Method used for forcing WAL updates out to disk. Possible
values are
<literal>fsync</> (call <function>fsync()</> at each commit),
<literal>fdatasync</> (call <function>fdatasync()</> at each commit),
<literal>fsync_writethrough</> (force write-through of any disk write cache),
<literal>open_sync</> (write WAL files with <function>open()</> option <symbol>O_SYNC</>), and
<literal>open_datasync</> (write WAL files with <function>open()</> option <symbol>O_DSYNC</>).
values are:
</para>
<itemizedlist>
<listitem>
<para>
<literal>open_datasync</> (write WAL files with <function>open()</> option <symbol>O_DSYNC</>)
</para>
</listitem>
<listitem>
<para>
<literal>fdatasync</> (call <function>fdatasync()</> at each commit),
</para>
</listitem>
<listitem>
<para>
<literal>fsync</> (call <function>fsync()</> at each commit)
</para>
</listitem>
<listitem>
<para>
<literal>open_sync</> (write WAL files with <function>open()</> option <symbol>O_SYNC</>)
</para>
</listitem>
<listitem>
<para>
<literal>fsync_writethrough</> (force write-through of any disk write cache)
</para>
</listitem>
</itemizedlist>
<para>
Not all of these choices are available on all platforms.
The top-most supported option is used as the default.
If <varname>fsync</varname> is off then this setting is irrelevant.
This option can only be set at server start or in the
<filename>postgresql.conf</filename> file.

4
src/interfaces/libpq/fe-connect.c
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@ -1,4 +1,4 @@
/*-------------------------------------------------------------------------
conninfo_parse/*-------------------------------------------------------------------------
*
* fe-connect.c
* functions related to setting up a connection to the backend
@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-connect.c,v 1.314 2005/07/13 15:25:55 tgl Exp $
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-connect.c,v 1.315 2005/08/09 04:50:44 momjian Exp $
*
*-------------------------------------------------------------------------
*/