diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml index 3b013746a313306c2f0b3f8ba711fd47e7f3c35f..e69463a9e22ce5ccbcc2063f615879f9d2eac3fd 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>