From d12be5c37b43d591d7dd2847519376f83b43f7a5 Mon Sep 17 00:00:00 2001
From: Bruce Momjian <bruce@momjian.us>
Date: Fri, 17 Jan 2003 17:15:14 +0000
Subject: [PATCH] Add section on testing index scan.
---
doc/FAQ | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/doc/FAQ b/doc/FAQ
index 15c5316bb8c..78c113de9e0 100644
--- a/doc/FAQ
+++ b/doc/FAQ
@@ -1,7 +1,7 @@
Frequently Asked Questions (FAQ) for PostgreSQL
- Last updated: Sun Jan 12 13:36:11 EST 2003
+ Last updated: Fri Jan 17 12:15:04 EST 2003
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
@@ -749,6 +749,10 @@
ORDER BY col [ DESC ]
LIMIT 1;
+ If you believe the optimizer is incorrect in choosing a sequential
+ scan, use SET enable_seqscan TO 'off' and run tests to see if an index
+ scan is indeed faster.
+
When using wild-card operators such as LIKE or ~, indexes can only be
used in certain circumstances:
* The beginning of the search string must be anchored to the start
--
GitLab