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| author | Bruce Momjian <bruce@momjian.us> | 2008-12-10 11:05:49 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2008-12-10 11:05:49 +0000 |
| commit | 253fa736b978f298746763ef3113282f32b9f475 (patch) | |
| tree | d118bff906932f5dae73d3c73f9954aee504bbe9 | |
| parent | 5932915fef5a3fce0267de390650fd98b4a3d824 (diff) | |
| download | postgresql-253fa736b978f298746763ef3113282f32b9f475.tar.gz postgresql-253fa736b978f298746763ef3113282f32b9f475.zip | |
Update journaling performance docs based on comments by Michael Renner.
| -rw-r--r-- | doc/src/sgml/wal.sgml | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml index 3b013746a31..e69463a9e22 100644 --- a/doc/src/sgml/wal.sgml +++ b/doc/src/sgml/wal.sgml @@ -1,4 +1,4 @@ -<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.54 2008/12/06 21:34:27 momjian Exp $ --> +<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.55 2008/12/10 11:05:49 momjian Exp $ --> <chapter id="wal"> <title>Reliability and the Write-Ahead Log</title> @@ -139,13 +139,13 @@ <para> Because <acronym>WAL</acronym> restores database file contents after a crash, it is not necessary to use a - journaled filesystem; in fact, journaling overhead can - reduce performance. For best performance, turn off - <emphasis>data</emphasis> journaling as a filesystem mount - option, e.g. use <literal>data=writeback</> on Linux. - Meta-data journaling (e.g. file creation and directory - modification) is still desirable for faster rebooting after - a crash. + journaled filesystem for reliability. In fact, journaling + overhead can reduce performance, especially if journaling + causes file system <emphasis>data</emphasis> to be flushed + to disk. Fortunately, data flushing during journaling can + often be disabled with a filesystem mount option, e.g. + <literal>data=writeback</> on a Linux ext3 file system. + Journaled file systems do improve boot speed after a crash. </para> </tip> |