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Revert "Correct WAL space calculation formula in docs."

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This reverts commit 915116bc62.

Per discussion, the previous formula was in fact correct.

http://archives.postgresql.org/pgsql-docs/2010-10/msg00038.php
This commit is contained in:
Robert Haas
2010-10-27 21:24:02 -04:00
parent 0d5deebe11
commit 2cae0aeb9c
1 changed files with 3 additions and 3 deletions
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doc/src/sgml/wal.sgml
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@@ -481,9 +481,9 @@
<para> <para>
There will always be at least one WAL segment file, and will normally There will always be at least one WAL segment file, and will normally
not be more files than the higher of <xref linkend="guc-wal-keep-segments"> or not be more than (2 + <varname>checkpoint_completion_target</varname>) * <varname>checkpoint_segments</varname> + 1
(2 + <varname>checkpoint_completion_target</varname>) * <varname>checkpoint_segments</varname> + 1. or <varname>checkpoint_segments</> + <xref linkend="guc-wal-keep-segments"> + 1
Each segment file is normally 16 MB (though this size can be files. Each segment file is normally 16 MB (though this size can be
altered when building the server). You can use this to estimate space altered when building the server). You can use this to estimate space
requirements for <acronym>WAL</acronym>. requirements for <acronym>WAL</acronym>.
Ordinarily, when old log segment files are no longer needed, they Ordinarily, when old log segment files are no longer needed, they