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@ -14,7 +14,7 @@ |
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alink="#0000ff"> |
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alink="#0000ff"> |
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<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1> |
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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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<P>Current maintainer: Bruce Momjian (<A href= |
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"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR> |
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"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR> |
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@ -903,7 +903,7 @@ |
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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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<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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the indexes. Why?</H4> |
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Indexes are not automatically used by every query. Indexes are only |
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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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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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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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slower than a straight read through the table, or sequential scan. |
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