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Update set constraints man page

This commit is contained in:
Bruce Momjian 2000-04-14 23:12:29 +00:00
parent 0fe9b399c0
commit ade95052f8
1 changed files with 9 additions and 10 deletions
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19
doc/src/sgml/ref/set.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/set.sgml,v 1.40 2000/04/14 15:17:28 thomas Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/set.sgml,v 1.41 2000/04/14 23:12:29 momjian Exp $
Postgres documentation
-->
@ -269,10 +269,9 @@ SELECT setseed(<replaceable>value</replaceable>);
<term>CONSTRAINT</term>
<listitem>
<para>
SET CONSTRAINTS is the SQL3 specified command to change the
default behaviour of constraints with respect to deferring in the current
transaction. Allowed parameters are:
SET CONSTRAINTS controls the frequency of foreign key
constratint checking in the current transaction. Allowed
parameters are:
<variablelist>
<varlistentry>
<term><replaceable class="parameter">constraintlist</replaceable></term>
@ -296,11 +295,11 @@ SELECT setseed(<replaceable>value</replaceable>);
</para>
<para>
In deferred mode, the actual check of the constraint is held
back until either its mode is explicitly set to <option>IMMEDIATE</option>,
or until COMMIT. This is actually only done for foreign key
constraints, so it does not apply to UNIQUE or other
constraints.
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>
</listitem>
</varlistentry>