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Neil Conway
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Fix typo, other minor improvements.
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doc/src/sgml/wal.sgml

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<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.29 2004/08/08 04:34:43 tgl Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.30 2004/11/15 04:35:57 neilc 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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<firstterm>Checkpoints</firstterm><indexterm><primary>checkpoint</></> are points in the sequence of
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transactions at which it is guaranteed that the data files have
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been updated with all information logged before the checkpoint. At
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checkpoint time, all dirty data pages are flushed to disk and a
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special checkpoint record is written to the log file. As result, in
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the event of a crash, the recoverer knows from what point in the
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log (known as the redo record) it should start the REDO operation,
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since any changes made to data files before that record are already
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on disk. After a checkpoint has been made, any log segments written
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before the redo record are no longer needed and can be recycled or
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removed. (When <acronym>WAL</acronym> archiving is being done, the
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<firstterm>Checkpoints</firstterm><indexterm><primary>checkpoint</></>
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are points in the sequence of transactions at which it is guaranteed
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that the data files have been updated with all information logged before
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the checkpoint. At checkpoint time, all dirty data pages are flushed to
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disk and a special checkpoint record is written to the log file. As a
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result, in the event of a crash, the crash recovery procedure knows from
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what point in the log (known as the redo record) it should start the
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REDO operation, since any changes made to data files before that point
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are already on disk. After a checkpoint has been made, any log segments
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written before the redo record are no longer needed and can be recycled
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or removed. (When <acronym>WAL</acronym> archiving is being done, the
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log segments must be archived before being recycled or removed.)
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</para>
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