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Mention "PostgreSQL"'s hashes as slower/similar to btree.

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Bruce Momjian
2002-06-21 19:06:44 +00:00
parent 1415a8388f
commit dad0e20f29
3 changed files with 23 additions and 19 deletions
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11
doc/src/sgml/ref/create_index.sgml
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@@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_index.sgml,v 1.33 2002/06/21 16:52:00 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_index.sgml,v 1.34 2002/06/21 19:06:44 momjian Exp $
PostgreSQL documentation
-->
@@ -330,10 +330,11 @@ ERROR: Cannot create index: 'index_name' already exists.
the <literal>=</literal> operator.
</para>
<para>
Testing has shown hash indexes to be similar or slower than btree
indexes, and the index size and build time for hash indexes is much
worse. Hash indexes also suffer poor performance under high
concurrency. For these reasons, hash index use is discouraged.
Testing has shown PostgreSQL's hash indexes to be similar or slower
than btree indexes, and the index size and build time for hash
indexes is much worse. Hash indexes also suffer poor performance
under high concurrency. For these reasons, hash index use is
discouraged.
</para>
<para>