database/postgres
database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-04-22 23:02:54 +03:00
Code

Update hash warning in manual.

Browse Source
This commit is contained in:
Bruce Momjian 2002-06-21 16:52:00 +00:00
parent ebe4375fa1
commit 1415a8388f
2 changed files with 10 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
doc/src/sgml/indices.sgml
View File

@ -1,4 +1,4 @@
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/indices.sgml,v 1.32 2002/06/21 03:25:53 momjian Exp $ --> <!-- $Header: /cvsroot/pgsql/doc/src/sgml/indices.sgml,v 1.33 2002/06/21 16:52:00 momjian Exp $ -->
<chapter id="indexes"> <chapter id="indexes">
<title id="indexes-title">Indexes</title> <title id="indexes-title">Indexes</title>
@ -181,9 +181,10 @@ CREATE INDEX <replaceable>name</replaceable> ON <replaceable>table</replaceable>
</synopsis> </synopsis>
<note> <note>
<para> <para>
Testing has shown that hash indexes are slower than btree indexes, Testing has shown hash indexes to be similar or slower than btree
and the size and build time for hash indexes is much worse. For indexes, and the index size and build time for hash indexes is much
these reasons, hash index use is discouraged. worse. Hash indexes also suffer poor performance under high
concurrency. For these reasons, hash index use is discouraged.
</para> </para>
</note> </note>
</para> </para>

9
doc/src/sgml/ref/create_index.sgml
View File

@ -1,5 +1,5 @@
<!-- <!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/create_index.sgml,v 1.32 2002/06/21 03:25:53 momjian Exp $ $Header: /cvsroot/pgsql/doc/src/sgml/ref/create_index.sgml,v 1.33 2002/06/21 16:52:00 momjian Exp $
PostgreSQL documentation PostgreSQL documentation
--> -->
@ -330,9 +330,10 @@ ERROR: Cannot create index: 'index_name' already exists.
the <literal>=</literal> operator. the <literal>=</literal> operator.
</para> </para>
<para> <para>
Testing has shown that hash indexes are slower than btree indexes, Testing has shown hash indexes to be similar or slower than btree
and the size and build time for hash indexes is much worse. For indexes, and the index size and build time for hash indexes is much
these reasons, hash index use is discouraged. worse. Hash indexes also suffer poor performance under high
concurrency. For these reasons, hash index use is discouraged.
</para> </para>
<para> <para>