Gideon wrote:
Thanks for the quick reply.
No problem, but don't forget to cc: the list.
We basicaly need to run a database servers in 2 different
towns. Now there will be update's and selects and both need
to be in sync with each other. Aswell as if / when database in
town 1 goes down ... we need to be able to switch to the database
in town 2 for emergency purposes. We cannot use just one master
as the connectivity between the two towns isn't fast enough for
the amount of users that will be viewing data through the connection.
(The fastest affordable connection here for this purpose is round about
256k.)
A slow link is going to cause problems with most replication solutions
anyway. Well, there are two options that I can think of:
Option 1:
Run Slony replicating from town1 to town2.
Run PgPool connection pooling at town2 and route any update queries to
town1.
Cope with the delay on updates propagating.
Option 2:
Use table partitioning to split e.g. customers by town.
Use slony to replicate customers_town1 to town2 and customers_town2 to
town1.
Users can't update data "owned" by the other town - enforce this with
suitable GRANT/REVOKE.
Either of those any use?
--
Richard Huxton
Archonet Ltd
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