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