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Diffstat (limited to 'doc/FAQ')
| -rw-r--r-- | doc/FAQ | 8 |
1 files changed, 4 insertions, 4 deletions
@@ -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 |