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Clean up description of SET CONSTRAINTS.

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Thomas G. Lockhart 2000-04-18 15:23:34 +00:00
parent 07f600619e
commit 7f85cac04a
1 changed files with 17 additions and 8 deletions
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25
doc/src/sgml/ref/set.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/set.sgml,v 1.41 2000/04/14 23:12:29 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/set.sgml,v 1.42 2000/04/18 15:23:34 thomas Exp $
Postgres documentation
-->
@ -266,12 +266,14 @@ SELECT setseed(<replaceable>value</replaceable>);
</varlistentry>
<varlistentry>
<term>CONSTRAINT</term>
<term>CONSTRAINTS</term>
<listitem>
<para>
SET CONSTRAINTS controls the frequency of foreign key
constratint checking in the current transaction. Allowed
parameters are:
SET CONSTRAINTS affects the behavior of constraint evaluation
in the current transaction.
SET CONSTRAINTS, specified
in SQL3, has these allowed parameters:
<variablelist>
<varlistentry>
<term><replaceable class="parameter">constraintlist</replaceable></term>
@ -295,12 +297,19 @@ SELECT setseed(<replaceable>value</replaceable>);
</para>
<para>
In <option>DEFERRED</option> mode, foreign key constraints
marked as <option>DEFERRABLE</option> are checked only at
transaction commit.
In <option>IMMEDIATE</option> mode, foreign key constraints
are checked at the end of each query.
</para>
<para>
In <option>DEFERRED</option> mode, foreign key constraints
marked as <option>DEFERRABLE</option> are checked only at
transaction commit or until its mode is explicitly set to
<option>IMMEDIATE</option>.
This is actually only done for foreign key
constraints, so it does not apply to UNIQUE or other
constraints.
</para>
</listitem>
</varlistentry>