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Frequently Asked Questions (FAQ) for PostgreSQL
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- Last updated: Sun Mar 3 11:02:16 EST 2002
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+ Last updated: Sun Mar 3 13:35:39 EST 2002
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Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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4.8) My queries are slow or don't make use of the indexes. Why?
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Indexes are not automatically used by every query. Indexes are only
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- used if the table is larger than a minimum size, and the index selects
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+ used if the table is larger than a minimum size, and the query selects
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only a small percentage of the rows in the table. This is because the
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random disk access caused by an index scan is sometimes slower than a
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straight read through the table, or sequential scan.
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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: Sun Mar 3 11:02:16 EST 2002</ P >
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+ < P > Last updated: Sun Mar 3 13:35:39 EST 2002</ 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 >
@@ -903,7 +903,7 @@ <H4><A name="4.7">4.7</A>) How do I find out what tables or indexes
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< H4 > < A name ="4.8 "> 4.8</ A > ) My queries are slow or don't make use of
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the indexes. Why?</ H4 >
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Indexes are not automatically used by every query. Indexes are only
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- used if the table is larger than a minimum size, and the index
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+ used if the table is larger than a minimum size, and the query
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selects only a small percentage of the rows in the table. This is
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because the random disk access caused by an index scan is sometimes
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slower than a straight read through the table, or sequential scan.
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