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Frequently Asked Questions (FAQ) for PostgreSQL
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Last updated: Fri Apr 29 23:51:45 EDT 2005
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Last updated: Fri Apr 29 23:53:16 EDT 2005
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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: Fri Apr 29 23:51:45 EDT 2005</P>
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<P>Last updated: Fri Apr 29 23:53:16 EDT 2005</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>)
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<H3><A name="4.21">4.21</A>) What replication solutions are available?
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</H3>
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<P>Though "replication" is a single term, there are several technologies
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for doing replication, with advantages and disadvantages for each.</P>
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<P>Master/slave replication allows a single master to receive read/write
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queries, while slaves can only accept read/<SMALL>SELECT</SMALL> queries.
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The most popular freely available master-slave PostgreSQL replication
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solution is <A href="http://gborg.postgresql.org/project/slony1/projdisplay.php">
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queries, while slaves can only accept read/<SMALL>SELECT</SMALL>
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queries. The most popular freely available master-slave PostgreSQL
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replication solution is <A
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href="http://gborg.postgresql.org/project/slony1/projdisplay.php">
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Slony-I</A>.</P>
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<P>Multi-master replication allows read/write queries to be sent to
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multiple replicated computers. This capability also has a severe
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impact on performance due to the need to synchronize changes between
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servers. <A href="http://pgfoundry.org/projects/pgcluster/">Pgcluster</a>
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is the most popular such solution freely available for PostgreSQL.</P>
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multiple replicated computers. This capability also has a severe impact
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on performance due to the need to synchronize changes between servers.
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<A href="http://pgfoundry.org/projects/pgcluster/">Pgcluster</a> is the
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most popular such solution freely available for PostgreSQL.</P>
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<P>There are also commercial and hardware-based replication solutions
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available supporting a variety of replication models.</P>
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