-<!-- $Header: /cvsroot/pgsql/doc/src/sgml/wal.sgml,v 1.17 2002/08/30 16:50:50 momjian Exp $ -->
+<!-- $Header: /cvsroot/pgsql/doc/src/sgml/wal.sgml,v 1.18 2002/08/30 16:53:34 momjian Exp $ -->
<chapter id="wal">
<title>Write-Ahead Logging (<acronym>WAL</acronym>)</title>
</para>
<para>
- The number of 16MB segment files will always be at least
- 1, and will normally not exceed <varname>CHECKPOINT_SEGMENTS</varname>)
- + 1. This may be used to estimate space requirements for WAL.
- Ordinarily, when old log segment files are no longer needed,
+ There will be at least one 16MB segment file, and will normally
+ not be more than <varname>CHECKPOINT_SEGMENTS</varname>)
+ + 1 files. You can use this to estimate space requirements for
+ WAL. Ordinarily, when old log segment files are no longer needed,
they are recycled (renamed to become the next sequential future
segments). If, due to a short-term peak of log output rate, there
are more than <varname>CHECKPOINT_SEGMENTS</varname>) + 1 segment files,