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Postgres FD Implementation
Commit 5ab02fd1 authored by Bruce Momjian's avatar Bruce Momjian
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Update FAQ.

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doc/FAQ
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Frequently Asked Questions (FAQ) for PostgreSQL Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Sun Mar 3 11:02:16 EST 2002 Last updated: Sun Mar 3 13:35:39 EST 2002
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
...@@ -707,7 +707,7 @@ ...@@ -707,7 +707,7 @@
4.8) My queries are slow or don't make use of the indexes. Why? 4.8) My queries are slow or don't make use of the indexes. Why?
Indexes are not automatically used by every query. Indexes are only Indexes are not automatically used by every query. Indexes are only
used if the table is larger than a minimum size, and the index selects used if the table is larger than a minimum size, and the query selects
only a small percentage of the rows in the table. This is because the only a small percentage of the rows in the table. This is because the
random disk access caused by an index scan is sometimes slower than a random disk access caused by an index scan is sometimes slower than a
straight read through the table, or sequential scan. straight read through the table, or sequential scan.
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doc/src/FAQ/FAQ.html
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...@@ -14,7 +14,7 @@ ...@@ -14,7 +14,7 @@
alink="#0000ff"> alink="#0000ff">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1> <H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
<P>Last updated: Sun Mar 3 11:02:16 EST 2002</P> <P>Last updated: Sun Mar 3 13:35:39 EST 2002</P>
<P>Current maintainer: Bruce Momjian (<A href= <P>Current maintainer: Bruce Momjian (<A href=
"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR> "mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
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<H4><A name="4.8">4.8</A>) My queries are slow or don't make use of <H4><A name="4.8">4.8</A>) My queries are slow or don't make use of
the indexes. Why?</H4> the indexes. Why?</H4>
Indexes are not automatically used by every query. Indexes are only Indexes are not automatically used by every query. Indexes are only
used if the table is larger than a minimum size, and the index used if the table is larger than a minimum size, and the query
selects only a small percentage of the rows in the table. This is selects only a small percentage of the rows in the table. This is
because the random disk access caused by an index scan is sometimes because the random disk access caused by an index scan is sometimes
slower than a straight read through the table, or sequential scan. slower than a straight read through the table, or sequential scan.
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