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Fix obsolete claim that only btree indexes support multiple columns; 

GiST does now, too.  (Someone needs to write a description of GiST
to add to this chapter.  I don't know enough about it ...)
This commit is contained in:
Tom Lane 2001-11-18 00:59:00 +00:00
parent 0729c4a61f
commit 5906d7e096
1 changed files with 4 additions and 4 deletions
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8
doc/src/sgml/indices.sgml
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@ -1,4 +1,4 @@
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/indices.sgml,v 1.25 2001/11/08 23:34:33 petere Exp $ --> <!-- $Header: /cvsroot/pgsql/doc/src/sgml/indices.sgml,v 1.26 2001/11/18 00:59:00 tgl Exp $ -->
<chapter id="indexes"> <chapter id="indexes">
<title id="indexes-title">Indexes</title> <title id="indexes-title">Indexes</title>
@ -105,7 +105,7 @@ CREATE INDEX test1_id_index ON test1 (id);
<para> <para>
<productname>Postgres</productname> provides several index types: <productname>Postgres</productname> provides several index types:
B-tree, R-tree, and Hash. Each index type is more appropriate for B-tree, R-tree, GiST, and Hash. Each index type is more appropriate for
a particular query type because of the algorithm it uses. a particular query type because of the algorithm it uses.
<indexterm> <indexterm>
<primary>indexes</primary> <primary>indexes</primary>
@ -235,7 +235,7 @@ CREATE INDEX test2_mm_idx ON test2 (major, minor);
</para> </para>
<para> <para>
Currently, only the B-tree implementation supports multicolumn Currently, only the B-tree and GiST implementations support multicolumn
indexes. Up to 16 columns may be specified. (This limit can be indexes. Up to 16 columns may be specified. (This limit can be
altered when building <productname>Postgres</productname>; see the altered when building <productname>Postgres</productname>; see the
file <filename>pg_config.h</filename>.) file <filename>pg_config.h</filename>.)
@ -291,7 +291,7 @@ SELECT name FROM test2 WHERE major = <replaceable>constant</replaceable> OR mino
<synopsis> <synopsis>
CREATE UNIQUE INDEX <replaceable>name</replaceable> ON <replaceable>table</replaceable> (<replaceable>column</replaceable> <optional>, ...</optional>); CREATE UNIQUE INDEX <replaceable>name</replaceable> ON <replaceable>table</replaceable> (<replaceable>column</replaceable> <optional>, ...</optional>);
</synopsis> </synopsis>
Only B-tree indexes can be declared unique. Currently, only B-tree indexes can be declared unique.
</para> </para>
<para> <para>