mirror of https://github.com/postgres/postgres
Updates from Ian Barwick.
Update FAQ with new URL's for site.
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Bruce Momjian
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doc/FAQ
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doc/FAQ
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Frequently Asked Questions (FAQ) for PostgreSQL
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Last updated: Fri Dec 24 12:13:41 EST 2004
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Last updated: Fri Dec 24 12:18:49 EST 2004
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Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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alink="#0000ff">
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<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
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<P>Last updated: Wed Dec 15 20:06:34 EST 2004</P>
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<P>Last updated: Fri Dec 24 12:18:49 EST 2004</P>
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<P>Current maintainer: Bruce Momjian (<A href=
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"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
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</P>
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<P>The most recent version of this document can be viewed at <A href=
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"http://www.PostgreSQL.org/docs/faqs/FAQ.html">http://www.PostgreSQL.org/docs/faqs/FAQ.html</A>.</P>
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"http://www.postgresql.org/files/documentation/faqs/FAQ.html">
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http://www.postgresql.org/files/documentation/faqs/FAQ.html</A>.</P>
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<P>Platform-specific questions are answered at <A href=
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"http://www.PostgreSQL.org/docs/index.html">http://www.PostgreSQL.org/docs/index.html</A>.</P>
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"http://www.postgresql.org/docs/faq/">
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http://www.postgresql.org/docs/faq/</A>.</P>
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<HR>
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<H2 align="center">General Questions</H2>
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@ -177,7 +179,8 @@
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responsible for all development of PostgreSQL. It is a community
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project and is not controlled by any company. To get involved, see
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the developer's FAQ at <A href=
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"http://www.PostgreSQL.org/docs/faqs/FAQ_DEV.html">http://www.PostgreSQL.org/docs/faqs/FAQ_DEV.html</A>
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"http://www.postgresql.org/files/documentation/faqs/FAQ_DEV.html">
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http://www.postgresql.org/files/documentation/faqs/FAQ_DEV.html</A>
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</P>
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<P>The authors of PostgreSQL 1.01 were Andrew Yu and Jolly Chen.
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@ -339,8 +342,9 @@
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href=
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"http://techdocs.PostgreSQL.org/">http://techdocs.PostgreSQL.org/</A>.</P>
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<P><I>psql</I> has some nice \d commands to show information about
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types, operators, functions, aggregates, etc.</P>
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<P>The command line client program <I>psql</I> has some \d commands to show
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information about types, operators, functions, aggregates, etc. - use \? to
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display the available commands.</P>
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<P>Our web site contains even more documentation.</P>
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@ -398,8 +402,8 @@
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<H4><A name="1.13">1.13</A>) How do I submit a bug report?</H4>
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<P>Visit the PostgreSQL bug form at <A href=
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"http://www.postgresql.org/bugform.html">
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http://www.postgresql.org/bugform.html</A>.</P>
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"http://www.postgresql.org/support/submitbug">
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http://www.postgresql.org/support/submitbug</A>.</P>
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<P>Also check out our ftp site <A href=
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"ftp://ftp.PostgreSQL.org/pub">ftp://ftp.PostgreSQL.org/pub</A> to
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@ -425,21 +429,15 @@
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<DT><B>Performance</B></DT>
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<DD>PostgreSQL has performance similar to other commercial and
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open source databases. it is faster for some things, slower for
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<DD>PostgreSQL's performance is comparable to other commercial and
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open source databases. It is faster for some things, slower for
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others. In comparison to MySQL or leaner database systems, we are
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faster for multiple users, complex queries, and a read/write query
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load. MySQL is faster for simple SELECT queries done by a few users.
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Of course, MySQL does not have most of the features mentioned in the
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<I>Features</I> section above. We are built for reliability and
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features, and we continue to improve performance in every
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release. There is an interesting Web page comparing PostgreSQL to
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MySQL at <A href="http://openacs.org/philosophy/why-not-mysql.html">
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http://openacs.org/philosophy/why-not-mysql.html</A> Also, MySQL is
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is a company that distributes its products via open source, and requires
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a commercial license for close-source software, not an
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open source development community like PostgreSQL.<BR>
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release. <BR>
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<BR>
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</DD>
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"contributions" item is solely to support the PostgreSQL project
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and does not fund any specific company. If you prefer, you can also
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send a check to the contact address.</P>
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<P>Also, if you have a success story about PostgreSQL, please email
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it to our advocacy list at <a href="mailto:pgsql-advocacy@postgresql.org">
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pgsql-advocacy@postgresql.org</a>.</P>
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<HR>
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<P>Also, if you have a success story about PostgreSQL, please submit
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it to our advocacy site at <a href="http://advocacy.postgresql.org">
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http://advocacy.postgresql.org</a>.</P>
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<H2 align="center">User Client Questions</H2>
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<H4><A name="2.1">2.1</A>) Are there <SMALL>ODBC</SMALL> drivers
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<P>Yes, there are several graphical interfaces to PostgreSQL available.
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These include PgAccess <a href="http://www.pgaccess.org">
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http://www.pgaccess.org</a>), PgAdmin III (<a
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http://www.pgaccess.org</a>), pgAdmin III (<a
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href="http://www.pgadmin.org">http://www.pgadmin.org</a>, RHDB Admin (<a
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href="http://sources.redhat.com/rhdb/">http://sources.redhat.com/rhdb/
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</a>), TORA (<a href="http://www.globecom.net/tora/">http://www.globecom.net/tora/
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kernel's limit on shared memory space. Each buffer is 8K and the
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default is 1000 buffers.</P>
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<P>You can also use the <I>sort_mem</I> and <I>work_mem</I> options
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to increase the maximum amount of memory used by the backend processes
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for each temporary sort. The default is 1024 (i.e. 1MB).</P>
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<P>You can also use the <I>sort_mem</I> (from PostgreSQL 8.0: <I>work_mem</I>)
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options to increase the maximum amount of memory used by the backend
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processes for each temporary sort. The default is 1024 (i.e. 1MB).</P>
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<P>You can also use the <SMALL>CLUSTER</SMALL> command to group
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data in tables to match an index. See the <SMALL>CLUSTER</SMALL>
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@ -1170,14 +1168,14 @@ BYTEA bytea variable-length byte array (null-byte safe)
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execute("INSERT INTO person (name) VALUES ('Blaise Pascal')");
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new_id = execute("SELECT currval('person_id_seq')");
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</PRE>
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Finally, you could use the <A href="#4.16"><SMALL>OID</SMALL></A>
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<P>Finally, you could use the <A href="#4.16"><SMALL>OID</SMALL></A>
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returned from the <SMALL>INSERT</SMALL> statement to look up the
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default value, though this is probably the least portable approach,
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and the oid value will wrap around when it reaches 4 billion.
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In Perl, using DBI with Edmund Mergl's DBD::Pg module, the oid
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value is made available via <I>$sth->{pg_oid_status}</I> after
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<I>$sth->execute()</I>.
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In Perl, using DBI with the DBD::Pg module, the oid value is made
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available via <I>$sth->{pg_oid_status}</I> after
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<I>$sth->execute()</I>.</P>
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<H4><A name="4.15.3">4.15.3</A>) Doesn't <I>currval()</I>
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lead to a race condition with other users?</H4>
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