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More index item rewording.kUpdate FAQ.

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Bruce Momjian
2005-01-30 04:06:26 +00:00
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doc/FAQ
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Frequently Asked Questions (FAQ) for PostgreSQL Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Sat Jan 29 23:04:53 EST 2005 Last updated: Sat Jan 29 23:06:02 EST 2005
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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4.4) What is the maximum size for a row, a table, and a database? 4.4) What is the maximum size for a row, a table, and a database?
4.5) How much database disk space is required to store data from a 4.5) How much database disk space is required to store data from a
typical text file? typical text file?
4.6) Why are my queries slow? Why don't they make use of indexes? 4.6) Why are my queries slow? Why don't they use my indexes?
4.7) How do I see how the query optimizer is evaluating my query? 4.7) How do I see how the query optimizer is evaluating my query?
4.8) What is an R-tree index? 4.8) What is an R-tree index?
4.9) What is the Genetic Query Optimizer? 4.9) What is the Genetic Query Optimizer?
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NULLs are stored as bitmaps, so they use very little space. NULLs are stored as bitmaps, so they use very little space.
4.6) Why are my queries slow? Why don't they make use of indexes? 4.6) Why are my queries slow? Why don't they use my indexes?
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 query selects used if the table is larger than a minimum size, and the query selects

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doc/src/FAQ/FAQ.html
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alink="#0000ff"> alink="#0000ff">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1> <H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
<P>Last updated: Sat Jan 29 23:04:53 EST 2005</P> <P>Last updated: Sat Jan 29 23:06:02 EST 2005</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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<A href="#4.5">4.5</A>) How much database disk space is required <A href="#4.5">4.5</A>) How much database disk space is required
to store data from a typical text file?<BR> to store data from a typical text file?<BR>
<A href="#4.6">4.6</A>) Why are my queries slow? Why don't they <A href="#4.6">4.6</A>) Why are my queries slow? Why don't they
make use of indexes?<BR> use my indexes?<BR>
<A href="#4.7">4.7</A>) How do I see how the query optimizer is <A href="#4.7">4.7</A>) How do I see how the query optimizer is
evaluating my query?<BR> evaluating my query?<BR>
<A href="#4.8">4.8</A>) What is an R-tree index?<BR> <A href="#4.8">4.8</A>) What is an R-tree index?<BR>
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use very little space.</P> use very little space.</P>
<H4><A name="4.6">4.6</A>) Why are my queries slow? Why don't they <H4><A name="4.6">4.6</A>) Why are my queries slow? Why don't they
make use of indexes?</H4> use my indexes?</H4>
<P>Indexes are not automatically used by every query. Indexes are only <P>Indexes are not automatically used by every query. Indexes are only
used if the table is larger than a minimum size, and the query used if the table is larger than a minimum size, and the query