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| author | Bruce Momjian <bruce@momjian.us> | 2006-02-24 15:00:48 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2006-02-24 15:00:48 +0000 |
| commit | 032858216caa0e820ddfe32ec4cd91a2de31a6b4 (patch) | |
| tree | 24279e57214641e6c0e1d2f95016ffb290bca3f6 /doc/src/FAQ | |
| parent | 39825338b4de141a300850f3211141dbb7729118 (diff) | |
| download | postgresql-032858216caa0e820ddfe32ec4cd91a2de31a6b4.tar.gz postgresql-032858216caa0e820ddfe32ec4cd91a2de31a6b4.zip | |
Backpatch FAQ changes to 8.1.X.
Diffstat (limited to 'doc/src/FAQ')
| -rw-r--r-- | doc/src/FAQ/FAQ.html | 14 |
1 files changed, 3 insertions, 11 deletions
diff --git a/doc/src/FAQ/FAQ.html b/doc/src/FAQ/FAQ.html index 3c10b91607a..7359ba271dc 100644 --- a/doc/src/FAQ/FAQ.html +++ b/doc/src/FAQ/FAQ.html @@ -10,7 +10,7 @@ alink="#0000ff"> <H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1> - <P>Last updated: Sun Feb 12 12:15:49 EST 2006</P> + <P>Last updated: Fri Feb 24 09:59:35 EST 2006</P> <P>Current maintainer: Bruce Momjian (<A href= "mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>) @@ -742,16 +742,8 @@ table?</TD><TD>unlimited</TD></TR> usually faster than an index scan of a large table.</P> However, <SMALL>LIMIT</SMALL> combined with <SMALL>ORDER BY</SMALL> often will use an index because only a small portion of the table - is returned. In fact, though MAX() and MIN() don't use indexes, - it is possible to retrieve such values using an index with ORDER BY - and LIMIT: -<PRE> - SELECT col - FROM tab - ORDER BY col [ DESC ] - LIMIT 1; -</PRE> - + is returned.</P> + <P>If you believe the optimizer is incorrect in choosing a sequential scan, use <CODE>SET enable_seqscan TO 'off'</CODE> and run query again to see if an index scan is indeed faster.</P> |