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Frequently Asked Questions (FAQ) for PostgreSQL
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- Last updated: Tue May 22 17:50:25 EDT 2001
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+ Last updated: Wed May 30 18:57:52 EDT 2001
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Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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@@ -709,9 +709,9 @@ Maximum number of indexes on a table? unlimited
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column statistics on its own, so VACUUM ANALYZE must be run to collect
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them periodically.
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- Indexes are usually not used for ORDER BY operations : a sequential
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- scan followed by an explicit sort is faster than an indexscan of all
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- tuples of a large table, because it takes fewer disk accesses.
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+ Indexes are usually not used for ORDER BY or joins : a sequential scan
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+ followed by an explicit sort is faster than an indexscan of all tuples
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+ of a large table, because it takes fewer disk accesses.
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When using wild-card operators such as LIKE or ~, indices can only be
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used if the beginning of the search is anchored to the start of the
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alink ="#0000FF ">
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< H1 > Frequently Asked Questions (FAQ) for PostgreSQL</ H1 >
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- < P > Last updated: Tue May 22 17:50:25 EDT 2001</ P >
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+ < P > Last updated: Wed May 30 18:57:52 EDT 2001</ P >
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< P > Current maintainer: Bruce Momjian (< A href =
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"mailto:pgman@candle.pha.pa.us "> pgman@candle.pha.pa.us</ A > )< BR >
@@ -908,7 +908,7 @@ <H4><A name="4.9">4.9</A>) My queries are slow or don't make use of
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periodically.</ P >
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< P > Indexes are usually not used for < SMALL > ORDER BY</ SMALL >
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- operations : a sequential scan followed by an explicit sort is
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+ or joins : a sequential scan followed by an explicit sort is
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faster than an indexscan of all tuples of a large table, because it
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takes fewer disk accesses.</ P >
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