Document that archive_timeout will force new WAL files even if a single
checkpoint has happened, and recommend adjusting checkpoint_timeout to reduce the impact of this.
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<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.249 2010/02/03 17:25:05 momjian Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.250 2010/02/05 23:37:43 momjian Exp $ -->
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<chapter Id="runtime-config">
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<chapter Id="runtime-config">
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<title>Server Configuration</title>
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<title>Server Configuration</title>
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@ -1739,7 +1739,11 @@ archive_command = 'copy "%p" "C:\\server\\archivedir\\%f"' # Windows
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server to switch to a new WAL segment file periodically. When this
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server to switch to a new WAL segment file periodically. When this
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parameter is greater than zero, the server will switch to a new
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parameter is greater than zero, the server will switch to a new
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segment file whenever this many seconds have elapsed since the last
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segment file whenever this many seconds have elapsed since the last
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segment file switch. Note that archived files that are closed early
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segment file switch, and there has been any database activity,
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including a single checkpoint. (Increasing
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<varname>checkpoint_timeout</> will reduce unnecessary
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checkpoints on an idle system.)
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Note that archived files that are closed early
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due to a forced switch are still the same length as completely full
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due to a forced switch are still the same length as completely full
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files. Therefore, it is unwise to use a very short
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files. Therefore, it is unwise to use a very short
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<varname>archive_timeout</> — it will bloat your archive
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<varname>archive_timeout</> — it will bloat your archive
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@ -38,7 +38,7 @@
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*
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*
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*
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*
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* IDENTIFICATION
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/postmaster/bgwriter.c,v 1.66 2010/01/15 09:19:02 heikki Exp $
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* $PostgreSQL: pgsql/src/backend/postmaster/bgwriter.c,v 1.67 2010/02/05 23:37:43 momjian Exp $
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*
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*
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*-------------------------------------------------------------------------
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*-------------------------------------------------------------------------
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*/
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*/
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@ -543,7 +543,10 @@ BackgroundWriterMain(void)
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/*
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/*
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* CheckArchiveTimeout -- check for archive_timeout and switch xlog files
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* CheckArchiveTimeout -- check for archive_timeout and switch xlog files
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* if needed
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*
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* This will switch to a new WAL file and force an archive file write
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* if any activity is recorded in the current WAL file, including just
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* a single checkpoint record.
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*/
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*/
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static void
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static void
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CheckArchiveTimeout(void)
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CheckArchiveTimeout(void)
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