Ühel kenal päeval, N, 2007-07-12 kell 14:00, kirjutas Hannu Krosing: > Ühel kenal päeval, K, 2007-07-11 kell 19:08, kirjutas Greg Smith: > > On Wed, 11 Jul 2007, Narasimha Rao P.A wrote: > > > > > Does postgreSQL support distributive query processing > > > > Not internally. It's possible in some situations to split queries up > > across multiple nodes using add-on software. pgpool-II, available at > > http://pgfoundry.org/projects/pgpool/ provides an implementation of > > distributed queries if your table has a type of key such that you split > > across it, but it's relatively immature software > > Actually it is not "immature" at all, it is used 24/7 doing tens of > thousands of queries per second :P
uups, I thought you were talking about plproxy ver.2 http://pgfoundry.org/projects/plproxy all my ranting is about it, not pgpool II, which is indeed quite new project ;) > But it is limited (by design) in what it can do - it is meant to run a > postgresql _function_ on one or more db hosts based on parameter > hash(es). > > This can be used as a tool to construct a system which does distributed > queries, and also to distribute load on small OLTP queries over a set of > databases. > > > and you would have to > > look at it very carefully to see if that parallel query implementation > > could fit your needs. > > It has no parallel query implementation by itself (other than a special > running the same SQL on a set of hosts and merging the results), but you > definitely can progrem on using pgpool. > > If you need something to distribute queries over a number of hosts > automatically, there is a commercial data warehousing product (based on > postgresql) available from greenplum, which does exactly this: > > http://www.greenplum.com/index.php?page=greenplum-database > > > > -- > > * Greg Smith [EMAIL PROTECTED] http://www.gregsmith.com Baltimore, MD > > > > ---------------------------(end of broadcast)--------------------------- > > TIP 6: explain analyze is your friend > > > ---------------------------(end of broadcast)--------------------------- > TIP 6: explain analyze is your friend ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
