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Reword index/slow query item.

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Bruce Momjian
2005-01-30 04:05:15 +00:00
parent 97052bc9c9
commit bbefccec09
2 changed files with 8 additions and 8 deletions
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doc/src/FAQ/FAQ.html
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@ -10,7 +10,7 @@
alink="#0000ff">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
<P>Last updated: Sat Jan 29 23:02:37 EST 2005</P>
<P>Last updated: Sat Jan 29 23:04:53 EST 2005</P>
<P>Current maintainer: Bruce Momjian (<A href=
"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
@ -82,8 +82,8 @@
table, and a database?<BR>
<A href="#4.5">4.5</A>) How much database disk space is required
to store data from a typical text file?<BR>
<A href="#4.6">4.6</A>) My queries are slow or don't make use of
the indexes. Why?<BR>
<A href="#4.6">4.6</A>) Why are my queries slow? Why don't they
make use of indexes?<BR>
<A href="#4.7">4.7</A>) How do I see how the query optimizer is
evaluating my query?<BR>
<A href="#4.8">4.8</A>) What is an R-tree index?<BR>
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<P><SMALL>NULL</SMALL>s are stored as bitmaps, so they
use very little space.</P>
<H4><A name="4.6">4.6</A>) My queries are slow or don't make use of
the indexes. Why?</H4>
<H4><A name="4.6">4.6</A>) Why are my queries slow? Why don't they
make use of indexes?</H4>
<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