diff --git a/doc/src/sgml/high-availability.sgml b/doc/src/sgml/high-availability.sgml index 766d223bd2bd0cc018a3a99f0f24f082d0c9276f..463bac1f4808881394bf7503d3c3f29d40759a4a 100644 --- a/doc/src/sgml/high-availability.sgml +++ b/doc/src/sgml/high-availability.sgml @@ -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"> <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 this is unacceptable, either the middleware or the application 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 using two-phase commit (<xref linkend="sql-prepare-transaction"> and <xref linkend="sql-commit-prepared">.