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Mention that when alter rewrites a table, indexes are also rebuilt.

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This commit is contained in:
Bruce Momjian
2010-06-24 14:57:21 +00:00
parent d8cd283a08
commit f5dc03dc69
1 changed files with 3 additions and 3 deletions
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doc/src/sgml/ref/alter_table.sgml
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@@ -1,5 +1,5 @@
<!-- <!--
$PostgreSQL: pgsql/doc/src/sgml/ref/alter_table.sgml,v 1.114 2010/06/09 17:48:10 alvherre Exp $ $PostgreSQL: pgsql/doc/src/sgml/ref/alter_table.sgml,v 1.115 2010/06/24 14:57:21 momjian Exp $
PostgreSQL documentation PostgreSQL documentation
--> -->
@@ -689,8 +689,8 @@ ALTER TABLE <replaceable class="PARAMETER">name</replaceable>
<para> <para>
Adding a column with a non-null default or changing the type of an Adding a column with a non-null default or changing the type of an
existing column will require the entire table to be rewritten. This existing column will require the entire table and indexes to be rewritten.
might take a significant amount of time for a large table; and it will This might take a significant amount of time for a large table; and it will
temporarily require double the disk space. Adding or removing a system temporarily require double the disk space. Adding or removing a system
<literal>oid</> column likewise requires rewriting the entire table. <literal>oid</> column likewise requires rewriting the entire table.
</para> </para>