Frequently Asked Questions (FAQ) for PostgreSQL
- Last updated: Sun Apr 24 08:01:19 EDT 2005
+ Last updated: Fri Apr 29 23:51:45 EDT 2005
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
4.21) What replication solutions are available?
- 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. Pgcluster 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/SELECT queries. The most popular master-slave
- PostgreSQL replication solution is Slony. There are also commercial
- and hardware-based replication solutions available.
+ Though "replication" is a single term, there are several technologies
+ for doing replication, with advantages and disadvantages for each.
+
+ Master/slave replication allows a single master to receive read/write
+ queries, while slaves can only accept read/SELECT queries. The most
+ popular freely available master-slave PostgreSQL replication solution
+ is Slony-I.
+
+ 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. Pgcluster is the most popular such solution freely available
+ for PostgreSQL.
+
+ There are also commercial and hardware-based replication solutions
+ available supporting a variety of replication models.
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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>)
<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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