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another section if required by the platform (instead of the old way of building them in section "l" and always transforming them to the platform-specific section). This speeds up the installation on common platforms, and it avoids some funny business with the man page tools and build process.
60 lines
1.7 KiB
Plaintext
60 lines
1.7 KiB
Plaintext
<!-- $PostgreSQL: pgsql/doc/src/sgml/ref/checkpoint.sgml,v 1.16 2008/11/14 10:22:45 petere Exp $ -->
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<refentry id="sql-checkpoint">
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<refmeta>
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<refentrytitle id="sql-checkpoint-title">CHECKPOINT</refentrytitle>
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<manvolnum>7</manvolnum>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>CHECKPOINT</refname>
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<refpurpose>force a transaction log checkpoint</refpurpose>
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</refnamediv>
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<indexterm zone="sql-checkpoint">
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<primary>CHECKPOINT</primary>
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</indexterm>
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<refsynopsisdiv>
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<synopsis>
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CHECKPOINT
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</synopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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Write-Ahead Logging (WAL) puts a checkpoint in the transaction log
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every so often. (To adjust the automatic checkpoint interval, see
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the run-time configuration options <xref linkend="guc-checkpoint-segments">
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and <xref linkend="guc-checkpoint-timeout">.) The
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<command>CHECKPOINT</command> command forces an immediate
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checkpoint when the command is issued, without waiting for a
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scheduled checkpoint.
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</para>
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<para>
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A checkpoint is a point in the transaction log sequence at which
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all data files have been updated to reflect the information in the
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log. All data files will be flushed to disk. Refer to
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<xref linkend="wal"> for more information about the WAL system.
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</para>
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<para>
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Only superusers can call <command>CHECKPOINT</command>. The command is
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not intended for use during normal operation.
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</para>
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</refsect1>
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<refsect1>
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<title>Compatibility</title>
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<para>
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The <command>CHECKPOINT</command> command is a
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<productname>PostgreSQL</productname> language extension.
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</para>
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</refsect1>
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</refentry>
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