From 48beecda7cbd2e73ebc11c88d3567ad064604bda Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Sun, 7 Sep 2003 15:26:54 +0000
Subject: Remove geqo_random_seed parameter.  Having geqo reset the global
 random() sequence every time it's called is bogus --- it interferes with user
 control over the seed, and actually decreases randomness overall (because a
 seed based on time(NULL) is pretty predictable).  If you really want a
 reproducible result from geqo, do 'set seed = 0' before planning a query.

---
 doc/src/sgml/runtime.sgml | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

(limited to 'doc/src')

diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 9bbecfa76bb..425036d81d3 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -1,5 +1,5 @@
 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.203 2003/09/05 16:13:38 tgl Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.204 2003/09/07 15:26:45 tgl Exp $
 -->
 
 <Chapter Id="runtime">
@@ -1438,7 +1438,6 @@ SET ENABLE_SEQSCAN TO OFF;
       <term><varname>GEQO_EFFORT</varname> (<type>integer</type>)</term>
       <term><varname>GEQO_GENERATIONS</varname> (<type>integer</type>)</term>
       <term><varname>GEQO_POOL_SIZE</varname> (<type>integer</type>)</term>
-      <term><varname>GEQO_RANDOM_SEED</varname> (<type>integer</type>)</term>
       <term><varname>GEQO_SELECTION_BIAS</varname> (<type>floating point</type>)</term>
       <listitem>
        <para>
@@ -1455,9 +1454,7 @@ SET ENABLE_SEQSCAN TO OFF;
         is roughly proportional to the sum of pool size and generations.
         The selection bias is the selective pressure within the
         population. Values can be from 1.50 to 2.00; the latter is the
-        default. The random seed can be set to get reproducible results
-        from the algorithm. If it is set to -1 then the algorithm
-        behaves non-deterministically.
+        default.
        </para>
       </listitem>
      </varlistentry>
-- 
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