diff options
| author | Bruce Momjian <bruce@momjian.us> | 2005-08-09 04:50:44 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2005-08-09 04:50:44 +0000 |
| commit | 487b757b7a0b560cbb612164a66888cd5421e124 (patch) | |
| tree | 51be277c35ebd29012b7258c8e70999c604b8d85 /doc/src | |
| parent | 3117afa75d6cdb27082a82654f69a53daa9ddda8 (diff) | |
| download | postgresql-487b757b7a0b560cbb612164a66888cd5421e124.tar.gz postgresql-487b757b7a0b560cbb612164a66888cd5421e124.zip | |
Clarify wal_sync_method options in documentation.
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/runtime.sgml | 39 |
1 files changed, 32 insertions, 7 deletions
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml index 91071ddc4ec..299fc28a7db 100644 --- a/doc/src/sgml/runtime.sgml +++ b/doc/src/sgml/runtime.sgml @@ -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. |