> .... Correct me if I am wrong, but will it not also suffer the same
> limitation as any statement based replication, namely that the "merged" > slave will have to sustain the same write load as all shards combined ?
I cannot tell you the exact mimeo behaviour, but if you incremental replication using an id/timestamp by >pulling< changes from the masters, you will normally batch them and insert all the changes to the slaves in a single transaction, which leads to less load as many times your limit is in transaction rate, not record rate. (i.e., every 5 minutes you query for all the tuples changed, and insert/update them all in one go ) ( Also, if tuples are updated many times between sweeps the slave will get only one ) Francisco Olarte.
You are right, requesting changes at fixed time intervals would certainly help reduce the load. I will have to test and see if a good balance can be achieved between not having stale data for too long and keeping up with writes.
Sébastien
If you have any questions while evaluating it, feel free to ask or post any issues to github.
-- Keith Fiske Database Administrator OmniTI Computer Consulting, Inc. http://www.keithf4.com