diff --git a/doc/FAQ b/doc/FAQ index 9b8539da9cb601fc9278f4cb18628fdf1c25645d..f59d74ff9a311274fb7d8b930f8d43073115d720 100644 --- a/doc/FAQ +++ b/doc/FAQ @@ -1,7 +1,7 @@ Frequently Asked Questions (FAQ) for PostgreSQL - Last updated: Tue May 22 17:50:25 EDT 2001 + Last updated: Wed May 30 18:57:52 EDT 2001 Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) @@ -709,9 +709,9 @@ Maximum number of indexes on a table? unlimited column statistics on its own, so VACUUM ANALYZE must be run to collect them periodically. - Indexes are usually not used for ORDER BY operations: a sequential - scan followed by an explicit sort is faster than an indexscan of all - tuples of a large table, because it takes fewer disk accesses. + Indexes are usually not used for ORDER BY or joins: a sequential scan + followed by an explicit sort is faster than an indexscan of all tuples + of a large table, because it takes fewer disk accesses. When using wild-card operators such as LIKE or ~, indices can only be used if the beginning of the search is anchored to the start of the diff --git a/doc/src/FAQ/FAQ.html b/doc/src/FAQ/FAQ.html index e4989d5a1aa0703895be1a6dbd18628555f83a19..932b2b7856db3d4fa266bc214a043110ef56a79f 100644 --- a/doc/src/FAQ/FAQ.html +++ b/doc/src/FAQ/FAQ.html @@ -12,7 +12,7 @@ alink="#0000FF"> <H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1> - <P>Last updated: Tue May 22 17:50:25 EDT 2001</P> + <P>Last updated: Wed May 30 18:57:52 EDT 2001</P> <P>Current maintainer: Bruce Momjian (<A href= "mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR> @@ -908,7 +908,7 @@ Maximum number of indexes on a table? unlimited periodically.</P> <P>Indexes are usually not used for <SMALL>ORDER BY</SMALL> - operations: a sequential scan followed by an explicit sort is + or joins: a sequential scan followed by an explicit sort is faster than an indexscan of all tuples of a large table, because it takes fewer disk accesses.</P>