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Frequently Asked Questions (FAQ) for PostgreSQL Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Mon Dec 11 17:44:33 EST 2006 Last updated: Mon Dec 11 17:45:54 EST 2006
Current maintainer: Bruce Momjian (bruce@momjian.us) Current maintainer: Bruce Momjian (bruce@momjian.us)

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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: Mon Dec 11 17:44:33 EST 2006</P> <P>Last updated: Mon Dec 11 17:45:54 EST 2006</P>
<P>Current maintainer: Bruce Momjian (<A href= <P>Current maintainer: Bruce Momjian (<A href=
"mailto:bruce@momjian.us">bruce@momjian.us</A>) "mailto:bruce@momjian.us">bruce@momjian.us</A>)
@ -42,7 +42,7 @@
development team?<BR> development team?<BR>
<A href="#item1.13">1.13</A>) How does PostgreSQL compare to other <A href="#item1.13">1.13</A>) How does PostgreSQL compare to other
<SMALL>DBMS</SMALL>s?<BR> <SMALL>DBMS</SMALL>s?<BR>
<H2 align="center">User Client Questions</H2> <H2 align="center">User Client Questions</H2>
<A href="#item2.1">2.1</A>) What interfaces are available for <A href="#item2.1">2.1</A>) What interfaces are available for
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PostgreSQL with Web pages?<BR> PostgreSQL with Web pages?<BR>
<A href="#item2.3">2.3</A>) Does PostgreSQL have a graphical user <A href="#item2.3">2.3</A>) Does PostgreSQL have a graphical user
interface?<BR> interface?<BR>
<H2 align="center">Administrative Questions</H2> <H2 align="center">Administrative Questions</H2>
<A href="#item3.1">3.1</A>) How do I install PostgreSQL somewhere other <A href="#item3.1">3.1</A>) How do I install PostgreSQL somewhere other
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</ul> </ul>
</li> </li>
</ul> </ul>
<H3 id="item1.9">1.9) How do I find out about known bugs or <H3 id="item1.9">1.9) How do I find out about known bugs or
missing features?</H3> missing features?</H3>
@ -307,7 +307,7 @@
<li>The new feature is added to the <li>The new feature is added to the
<A href="http://www.postgresql.org/docs/faqs.TODO.html">TODO</A> list</li> <A href="http://www.postgresql.org/docs/faqs.TODO.html">TODO</A> list</li>
</ul> </ul>
<P>PostgreSQL does not use a bug tracking system because we find <P>PostgreSQL does not use a bug tracking system because we find
it more efficient to respond directly to email and keep the it more efficient to respond directly to email and keep the
<A href="http://www.postgresql.org/docs/faqs.TODO.html">TODO</A> <A href="http://www.postgresql.org/docs/faqs.TODO.html">TODO</A>
@ -318,7 +318,7 @@
<a href="http://www.postgresql.org/developer/sourcecode/">CVS</a> <a href="http://www.postgresql.org/developer/sourcecode/">CVS</a>
log messages. Even the release notes do not list every change log messages. Even the release notes do not list every change
made to the software.</P> made to the software.</P>
<H3 id="item1.10">1.10) What documentation is available?</H3> <H3 id="item1.10">1.10) What documentation is available?</H3>
<P>PostgreSQL includes extensive documentation, including a large <P>PostgreSQL includes extensive documentation, including a large
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"http://mysite.verizon.net/Graeme_Birchall/id1.html">http://mysite.verizon.net/Graeme_Birchall/id1.html</A> "http://mysite.verizon.net/Graeme_Birchall/id1.html">http://mysite.verizon.net/Graeme_Birchall/id1.html</A>
</LI> </LI>
</UL> </UL>
<H3 id="item1.12">1.12) How do I submit a patch or join the development <H3 id="item1.12">1.12) How do I submit a patch or join the development
team?</H3> team?</H3>
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<P>There are three major areas for potential performance <P>There are three major areas for potential performance
improvement:</P> improvement:</P>
<DL> <DL>
<DT><B>Query Changes</B></DT> <DT><B>Query Changes</B></DT>
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PostgreSQL minor releases are designed to fix only common bugs PostgreSQL minor releases are designed to fix only common bugs
with the least risk. The community considers <i>not</i> upgrading with the least risk. The community considers <i>not</i> upgrading
more risky that upgrading.</P> more risky that upgrading.</P>
<P>Major releases (e.g. from 7.3 to 7.4) often change the internal <P>Major releases (e.g. from 7.3 to 7.4) often change the internal
format of system tables and data files. These changes are often complex, format of system tables and data files. These changes are often complex,
so we don't maintain backward compatibility for data files. A dump/reload so we don't maintain backward compatibility for data files. A dump/reload
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<P>There are also system tables beginning with <I>pg_</I> that describe <P>There are also system tables beginning with <I>pg_</I> that describe
these too.</P> these too.</P>
<P>Use <I>psql -l</I> will list all databases.</P> <P>Use <I>psql -l</I> will list all databases.</P>
<P>Also try the file <I>pgsql/src/tutorial/syscat.source</I>. It <P>Also try the file <I>pgsql/src/tutorial/syscat.source</I>. It
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</PRE> </PRE>
<P>You might then want to do <I>VACUUM FULL tab</I> to reclaim the <P>You might then want to do <I>VACUUM FULL tab</I> to reclaim the
disk space used by the expired rows.</P> disk space used by the expired rows.</P>
<H3 id="item4.4">4.4) What is the maximum size for a row, a <H3 id="item4.4">4.4) What is the maximum size for a row, a
table, and a database?</H3> table, and a database?</H3>
@ -735,7 +735,7 @@ table?</TD><TD>unlimited</TD></TR>
<P><SMALL>NULL</SMALL>s are stored as bitmaps, so they <P><SMALL>NULL</SMALL>s are stored as bitmaps, so they
use very little space.</P> use very little space.</P>
<H3 id="item4.6">4.6) Why are my queries slow? Why don't they <H3 id="item4.6">4.6) Why are my queries slow? Why don't they
use my indexes?</H3> use my indexes?</H3>
@ -760,7 +760,7 @@ table?</TD><TD>unlimited</TD></TR>
However, <SMALL>LIMIT</SMALL> combined with <SMALL>ORDER BY</SMALL> However, <SMALL>LIMIT</SMALL> combined with <SMALL>ORDER BY</SMALL>
often will use an index because only a small portion of the table often will use an index because only a small portion of the table
is returned.</P> is returned.</P>
<P>If you believe the optimizer is incorrect in choosing a <P>If you believe the optimizer is incorrect in choosing a
sequential scan, use <CODE>SET enable_seqscan TO 'off'</CODE> and sequential scan, use <CODE>SET enable_seqscan TO 'off'</CODE> and
run query again to see if an index scan is indeed faster.</P> run query again to see if an index scan is indeed faster.</P>
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SELECT COALESCE(col1, '') || COALESCE(col2, '') SELECT COALESCE(col1, '') || COALESCE(col2, '')
FROM tab FROM tab
</PRE> </PRE>
<P>To sort by the <SMALL>NULL</SMALL> status, use the <SMALL>IS NULL</SMALL> <P>To sort by the <SMALL>NULL</SMALL> status, use the <SMALL>IS NULL</SMALL>
and <SMALL>IS NOT NULL</SMALL> modifiers in your <SMALL>ORDER BY</SMALL> clause. and <SMALL>IS NOT NULL</SMALL> modifiers in your <SMALL>ORDER BY</SMALL> clause.
Things that are <I>true</I> will sort higher than things that are <I>false</I>, Things that are <I>true</I> will sort higher than things that are <I>false</I>,
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execute("INSERT INTO person (name) VALUES ('Blaise Pascal')"); execute("INSERT INTO person (name) VALUES ('Blaise Pascal')");
new_id = execute("SELECT currval('person_id_seq')"); new_id = execute("SELECT currval('person_id_seq')");
</PRE> </PRE>
<H3 id="item4.11.3">4.11.3) Doesn't <I>currval()</I> <H3 id="item4.11.3">4.11.3) Doesn't <I>currval()</I>
lead to a race condition with other users?</H3> lead to a race condition with other users?</H3>