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redo record -> undo record, Tom Lane.

This commit is contained in:
Bruce Momjian 2001-05-15 13:57:37 +00:00
parent 9478206d32
commit 3848a14ed7
1 changed files with 2 additions and 2 deletions
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doc/src/sgml/wal.sgml
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<!-- $Header: /cvsroot/pgsql/doc/src/sgml/wal.sgml,v 1.5 2001/03/16 05:44:33 tgl Exp $ -->
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/wal.sgml,v 1.6 2001/05/15 13:57:37 momjian Exp $ -->
<chapter id="wal">
<title>Write-Ahead Logging (<acronym>WAL</acronym>)</title>
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log (known as the redo record) it should start the REDO operation,
since any changes made to data files before that record are already
on disk. After a checkpoint has been made, any log segments written
before the redo record are removed, so checkpoints are used to free
before the undo records are removed, so checkpoints are used to free
disk space in the <acronym>WAL</acronym> directory. (When
<acronym>WAL</acronym>-based <acronym>BAR</acronym> is implemented,
the log segments can be archived instead of just being removed.)