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Add mention of index on foreign key for frequently updated primary key

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tables.
This commit is contained in:
Bruce Momjian
2002-01-03 06:26:22 +00:00
parent a4ee277e17
commit bc29b06b0a
1 changed files with 10 additions and 1 deletions
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11
doc/src/sgml/ref/create_table.sgml
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@ -1,5 +1,5 @@
<!-- <!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_table.sgml,v 1.50 2001/12/08 03:24:35 thomas Exp $ $Header: /cvsroot/pgsql/doc/src/sgml/ref/create_table.sgml,v 1.51 2002/01/03 06:26:22 momjian Exp $
PostgreSQL documentation PostgreSQL documentation
--> -->
@ -437,6 +437,13 @@ and <replaceable class="PARAMETER">table_constraint</replaceable> is:
</varlistentry> </varlistentry>
</variablelist> </variablelist>
</para> </para>
<para>
If primary key column is updated frequently, it may be wise to
add an index to the <literal>REFERENCES</literal> column so that
<literal>NO ACTION</literal> and <literal>CASCADE</literal>
actions associated with the <literal>REFERENCES</literal>
column can be more efficiently performed.
</para>
</listitem> </listitem>
</varlistentry> </varlistentry>
@ -472,6 +479,8 @@ and <replaceable class="PARAMETER">table_constraint</replaceable> is:
</listitem> </listitem>
</varlistentry> </varlistentry>
</variablelist> </variablelist>
</refsect1> </refsect1>