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Bruce Momjian 2001-08-20 20:37:19 +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: Tue Jul 10 21:01:47 EDT 2001 Last updated: Mon Aug 20 16:37:10 EDT 2001
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)

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<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1> <H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
<P>Last updated: Tue Jul 10 21:01:47 EDT 2001</P> <P>Last updated: Mon Aug 20 16:37:10 EDT 2001</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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See our <A href="http://www.PostgreSQL.org/docs/todo.html">TODO</A> See our <A href="http://www.PostgreSQL.org/docs/todo.html">TODO</A>
list for known bugs, missing features, and future plans.</P> list for known bugs, missing features, and future plans.</P>
<H4><A name="1.10">1.10</A>) How can I learn <H4><A name="1.10">1.10</A>) How can I learn <SMALL>SQL</SMALL>?</H4>
<SMALL>SQL</SMALL>?</H4>
<P>The PostgreSQL book at <A href= <P>The PostgreSQL book at <A href=
"http://www.PostgreSQL.org/docs/awbook.html">http://www.PostgreSQL.org/docs/awbook.html</A> "http://www.PostgreSQL.org/docs/awbook.html">http://www.PostgreSQL.org/docs/awbook.html</A>
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<H4><A name="3.7">3.7</A>) How do I tune the database engine for <H4><A name="3.7">3.7</A>) How do I tune the database engine for
better performance?</H4> better performance?</H4>
<P>Certainly, indices can speed up queries. The <P>Certainly, indices can speed up queries. The <SMALL>EXPLAIN</SMALL>
<SMALL>EXPLAIN</SMALL> command allows you to see how PostgreSQL is command allows you to see how PostgreSQL is interpreting your query,
interpreting your query, and which indices are being used.</P> and which indices are being used.</P>
<P>If you are doing a lot of <SMALL>INSERTs</SMALL>, consider doing <P>If you are doing a lot of <SMALL>INSERTs</SMALL>, consider doing
them in a large batch using the <SMALL>COPY</SMALL> command. This them in a large batch using the <SMALL>COPY</SMALL> command. This
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because a sequential scan would be faster.</P> because a sequential scan would be faster.</P>
<P>For column-specific optimization statistics, use <SMALL>VACUUM <P>For column-specific optimization statistics, use <SMALL>VACUUM
ANALYZE.</SMALL> <SMALL>VACUUM ANALYZE</SMALL> is important for ANALYZE.</SMALL> V<SMALL>ACUUM ANALYZE</SMALL> is important for
complex multijoin queries, so the optimizer can estimate the number complex multijoin queries, so the optimizer can estimate the number
of rows returned from each table, and choose the proper join order. of rows returned from each table, and choose the proper join order.
The backend does not keep track of column statistics on its own, so The backend does not keep track of column statistics on its own, so