diff options
Diffstat (limited to 'doc/FAQ')
| -rw-r--r-- | doc/FAQ | 6 |
1 files changed, 3 insertions, 3 deletions
@@ -1,7 +1,7 @@ Frequently Asked Questions (FAQ) for PostgreSQL - Last updated: Wed May 30 18:57:52 EDT 2001 + Last updated: Wed May 30 19:00:33 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 or joins: a sequential scan + 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. + of a large table. This is because random disk access is very slow. 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 |