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Document that pgpool can be used with master/slave servers to avoid

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problems with non-deterministic functions.
This commit is contained in:
Bruce Momjian
2010-04-26 19:09:25 +00:00
parent 8f0ab2298f
commit 132c40424a
1 changed files with 6 additions and 2 deletions
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doc/src/sgml/high-availability.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/high-availability.sgml,v 1.62 2010/04/21 03:32:53 tgl Exp $ --> <!-- $PostgreSQL: pgsql/doc/src/sgml/high-availability.sgml,v 1.63 2010/04/26 19:09:25 momjian Exp $ -->
<chapter id="high-availability"> <chapter id="high-availability">
<title>High Availability, Load Balancing, and Replication</title> <title>High Availability, Load Balancing, and Replication</title>
@ -199,7 +199,11 @@ protocol to make nodes agree on a serializable transactional order.
SQL queries are broadcast (and not actual modified rows). If SQL queries are broadcast (and not actual modified rows). If
this is unacceptable, either the middleware or the application this is unacceptable, either the middleware or the application
must query such values from a single server and then use those must query such values from a single server and then use those
values in write queries. Also, care must be taken that all values in write queries. Another option is to use this replication
option with a traditional master-slave setup, i.e. data modification
queries are sent only to the master and are propogated to the
slaves via master-slave replication, not by the replication
middleware. Care must also be taken that all
transactions either commit or abort on all servers, perhaps transactions either commit or abort on all servers, perhaps
using two-phase commit (<xref linkend="sql-prepare-transaction"> using two-phase commit (<xref linkend="sql-prepare-transaction">
and <xref linkend="sql-commit-prepared">. and <xref linkend="sql-commit-prepared">.