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Update replication FAQ.

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Christopher Browne
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Bruce Momjian
2005-04-30 03:52:23 +00:00
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<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
<P>Last updated: Sun Apr 24 08:01:19 EDT 2005</P>
<P>Last updated: Fri Apr 29 23:51:45 EDT 2005</P>
<P>Current maintainer: Bruce Momjian (<A href=
"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)
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<H3><A name="4.21">4.21</A>) What replication solutions are available?
</H3>
<P>Though "replication" is a single term, there are two major replication
technologies. Multi-master replication allows read/write queries to be
sent to multiple replicated computers. Using this capability has a
serious performance impact. <A href="http://pgfoundry.org/projects/pgcluster/">
Pgcluster</A> is the most popular such solution available for PostgreSQL.
Master-slave replication allows a single master to receive read/write
queries, with slaves able to accept only read/<SMALL>SELECT</SMALL> queries.
The most popular master-slave PostgreSQL replication solution is
<A href="http://gborg.postgresql.org/project/slony1/projdisplay.php">
Slony</A>. There are also commercial and hardware-based replication
solutions available.</P>
<P>Though "replication" is a single term, there are several technologies
for doing replication, with advantages and disadvantages for each.</P>
<P>Master/slave replication allows a single master to receive read/write
queries, while slaves can only accept read/<SMALL>SELECT</SMALL> queries.
The most popular freely available master-slave PostgreSQL replication
solution is <A href="http://gborg.postgresql.org/project/slony1/projdisplay.php">
Slony-I</A>.</P>
<P>Multi-master replication allows read/write queries to be sent to
multiple replicated computers. This capability also has a severe
impact on performance due to the need to synchronize changes between
servers. <A href="http://pgfoundry.org/projects/pgcluster/">Pgcluster</a>
is the most popular such solution freely available for PostgreSQL.</P>
<P>There are also commercial and hardware-based replication solutions
available supporting a variety of replication models.</P>
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