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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
-->
@ -689,8 +689,8 @@ ALTER TABLE <replaceable class="PARAMETER">name</replaceable>
<para>
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
might take a significant amount of time for a large table; and it will
existing column will require the entire table and indexes to be rewritten.
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
<literal>oid</> column likewise requires rewriting the entire table.
</para>