From 6c6e6f7fd3ffa984a202b910ef3237e26f9d3c2e Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Tue, 1 Feb 2011 15:23:35 -0500
Subject: [PATCH] Document that effective cache size does not assume data
remains in the cache between queries.
---
doc/src/sgml/config.sgml | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 8bdc57febcc..3a0f755b080 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -2424,7 +2424,9 @@ SET ENABLE_SEQSCAN TO OFF;
space. This parameter has no effect on the size of shared
memory allocated by <productname>PostgreSQL</productname>, nor
does it reserve kernel disk cache; it is used only for estimation
- purposes. The default is 128 megabytes (<literal>128MB</>).
+ purposes. The system also does not assume data remains in
+ the disk cache between queries. The default is 128 megabytes
+ (<literal>128MB</>).
</para>
</listitem>
</varlistentry>
--
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