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Bruce Momjian 2005-04-30 03:53:17 +00:00
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Frequently Asked Questions (FAQ) for PostgreSQL Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Fri Apr 29 23:51:45 EDT 2005 Last updated: Fri Apr 29 23:53:16 EDT 2005
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: Fri Apr 29 23:51:45 EDT 2005</P> <P>Last updated: Fri Apr 29 23:53:16 EDT 2005</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>) "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><A name="4.21">4.21</A>) What replication solutions are available?
</H3> </H3>
<P>Though "replication" is a single term, there are several technologies <P>Though "replication" is a single term, there are several technologies
for doing replication, with advantages and disadvantages for each.</P> for doing replication, with advantages and disadvantages for each.</P>
<P>Master/slave replication allows a single master to receive read/write <P>Master/slave replication allows a single master to receive read/write
queries, while slaves can only accept read/<SMALL>SELECT</SMALL> queries. queries, while slaves can only accept read/<SMALL>SELECT</SMALL>
The most popular freely available master-slave PostgreSQL replication queries. The most popular freely available master-slave PostgreSQL
solution is <A href="http://gborg.postgresql.org/project/slony1/projdisplay.php"> replication solution is <A
href="http://gborg.postgresql.org/project/slony1/projdisplay.php">
Slony-I</A>.</P> Slony-I</A>.</P>
<P>Multi-master replication allows read/write queries to be sent to <P>Multi-master replication allows read/write queries to be sent to
multiple replicated computers. This capability also has a severe multiple replicated computers. This capability also has a severe impact
impact on performance due to the need to synchronize changes between on performance due to the need to synchronize changes between servers.
servers. <A href="http://pgfoundry.org/projects/pgcluster/">Pgcluster</a> <A href="http://pgfoundry.org/projects/pgcluster/">Pgcluster</a> is the
is the most popular such solution freely available for PostgreSQL.</P> most popular such solution freely available for PostgreSQL.</P>
<P>There are also commercial and hardware-based replication solutions <P>There are also commercial and hardware-based replication solutions
available supporting a variety of replication models.</P> available supporting a variety of replication models.</P>