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9a9f335284
Fix references to pg_hba.conf(5) since that is no longer a man page. Make minor repairs to "Compatibility" subsections.
77 lines
2.2 KiB
Plaintext
77 lines
2.2 KiB
Plaintext
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/ref/set_constraints.sgml,v 1.2 2000/07/14 15:27:14 thomas Exp $ -->
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<refentry id="SQL-SET-CONSTRAINTS">
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<refmeta>
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<refentrytitle id="SQL-SET-CONSTRAINTS-title">SET CONSTRAINTS</refentrytitle>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>SET CONSTRAINTS</refname>
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<refpurpose>Set the constraint mode of the current SQL-transaction</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<refsynopsisdivinfo>
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<date>2000-06-01</date>
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</refsynopsisdivinfo>
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<synopsis>
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SET CONSTRAINTS { ALL | <replaceable class="parameter">constraint</replaceable> [, ...] } { DEFERRED | IMMEDIATE }
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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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<command>SET CONSTRAINTS</command> sets the behavior of constraint
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evaluation in the current transaction. In
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<option>IMMEDIATE</option> mode, constraints are checked at the end
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of each statement. In <option>DEFERRED</option> mode, constraints
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are not checked until transaction commit.
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</para>
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<para>
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Upon creation, a constraint is always give one of three
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characteristics: <option>INITIALLY DEFERRED</option>,
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<option>INITIALLY IMMEDIATE DEFERRABLE</option>, or
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<option>INITIALLY IMMEDIATE NOT DEFERRABLE</option>. The third
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class is not affected by the <command>SET CONSTRAINTS</command>
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command.
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</para>
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<para>
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Currently, only foreign key constraints are affected by this
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setting. Check and unique constraints are always effectively
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initially immediate not deferrable.
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</para>
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</refsect1>
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<refsect1 id="R1-SQL-SET-CONSTRAINT-3">
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<title>Compatibility</title>
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<refsect2 id="R2-SQL-SET-CONSTRAINT-4">
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<title>SQL92, SQL99</title>
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<para>
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<command>SET CONSTRAINT</command> is defined in
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<acronym>SQL92</acronym> and <acronym>SQL99</acronym>.
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</para>
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</refsect2>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode:sgml
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sgml-omittag:nil
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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sgml-parent-document:nil
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sgml-default-dtd-file:"../reference.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:("/usr/lib/sgml/catalog")
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sgml-local-ecat-files:nil
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End:
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-->
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