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Remove documentation mention that hash indexes perform no better than 

btree;  keep mention about missing WAL logging.

Kenneth Marshall
This commit is contained in:
Bruce Momjian 2009-02-07 20:05:44 +00:00
parent 0c0d652031
commit 97072ad80c
1 changed files with 3 additions and 6 deletions
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9
doc/src/sgml/indices.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/indices.sgml,v 1.75 2008/09/23 09:20:34 heikki Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/indices.sgml,v 1.76 2009/02/07 20:05:44 momjian Exp $ -->
<chapter id="indexes">
<title id="indexes-title">Indexes</title>
@ -190,13 +190,10 @@ CREATE INDEX <replaceable>name</replaceable> ON <replaceable>table</replaceable>
<note>
<para>
Testing has shown <productname>PostgreSQL</productname>'s hash
indexes to perform no better than B-tree indexes, and the
index size and build time for hash indexes is much worse.
Furthermore, hash index operations are not presently WAL-logged,
Hash index operations are not presently WAL-logged,
so hash indexes might need to be rebuilt with <command>REINDEX</>
after a database crash.
For these reasons, hash index use is presently discouraged.
For this reason, hash index use is presently discouraged.
</para>
</note>