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Update create_index manual page to have unique section.

This commit is contained in:
Bruce Momjian 1997-01-13 17:22:25 +00:00
parent 003bfd96c2
commit 949cfe5271
1 changed files with 6 additions and 1 deletions
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7
src/man/create_index.l
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@ -1,6 +1,6 @@
.\" This is -*-nroff-*-
.\" XXX standard disclaimer belongs here....
.\" $Header: /cvsroot/pgsql/src/man/Attic/create_index.l,v 1.3 1996/12/11 00:27:14 momjian Exp $
.\" $Header: /cvsroot/pgsql/src/man/Attic/create_index.l,v 1.4 1997/01/13 17:22:25 momjian Exp $
.TH "CREATE INDEX" SQL 11/05/95 PostgreSQL PostgreSQL
.SH NAME
create index \(em construct a secondary index
@ -62,6 +62,11 @@ and then comparing it to the value on the other side of the operator.
Obviously, the decision to build a functional index represents a
tradeoff between space (for the index) and execution time.
.PP
The \fBunique\fR keyword causes the system to check for duplicate
values when the index is created (if data already exist) and each
time data is added.
Attempts to insert or update non-duplicate data will generate an error.
.PP
Postgres provides btree, rtree and hash access methods for
secondary indices. The btree access method is an implementation of
the Lehman-Yao high-concurrency btrees. The rtree access method