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22 Frequently Asked Questions (FAQ) for PostgreSQL
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4- Last updated: Sun Mar 3 11:02:16 EST 2002
4+ Last updated: Sun Mar 3 13:35:39 EST 2002
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66 Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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707707 4.8) My queries are slow or don't make use of the indexes. Why?
708708
709709 Indexes are not automatically used by every query. Indexes are only
710- used if the table is larger than a minimum size, and the index selects
710+ used if the table is larger than a minimum size, and the query selects
711711 only a small percentage of the rows in the table. This is because the
712712 random disk access caused by an index scan is sometimes slower than a
713713 straight read through the table, or sequential scan.
Original file line number Diff line number Diff line change 1414 alink ="#0000ff ">
1515 < H1 > Frequently Asked Questions (FAQ) for PostgreSQL</ H1 >
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17- < P > Last updated: Sun Mar 3 11:02:16 EST 2002</ P >
17+ < P > Last updated: Sun Mar 3 13:35:39 EST 2002</ P >
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1919 < P > Current maintainer: Bruce Momjian (< A href =
2020 "mailto:pgman@candle.pha.pa.us "> pgman@candle.pha.pa.us</ A > )< BR >
@@ -903,7 +903,7 @@ <H4><A name="4.7">4.7</A>) How do I find out what tables or indexes
903903 < H4 > < A name ="4.8 "> 4.8</ A > ) My queries are slow or don't make use of
904904 the indexes. Why?</ H4 >
905905 Indexes are not automatically used by every query. Indexes are only
906- used if the table is larger than a minimum size, and the index
906+ used if the table is larger than a minimum size, and the query
907907 selects only a small percentage of the rows in the table. This is
908908 because the random disk access caused by an index scan is sometimes
909909 slower than a straight read through the table, or sequential scan.
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