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RAMFS with Postgres

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Hi,

I am trying RAMFS solution with Postgres wherein I am pushing the most heavily used tables in RAM. I have 32GB RAM on a 64 bit opteron machine. My database size is 40GB. I think Linux allows max. of 16GB (half of available RAM) to be used directly to push tables to it.

I am concerned about reliabilty here (what if there is a power failure). What are the things that need to be considered and what all can be done to ensure that there is no data loss in case something goes wrong. What steps must be taken to ensure data recovery. I am planning to use Slony replication to replicate my database to a diff node so that incase something goes wrong, I can restore it from replication node and start my runs on that data again. The only problem here is that I need to run engines from beginning. Is there any other way of doing the same thing or such a thing is good enough given the fact that a failure like this happens very rarely. The most imp. thing for me is the **data** which should not be lost under any circumstances.

Has anyone used Slony replication before. How good is it. Is there anything else available which is better then Slony Replication?

Regards,
Vinita Bansal

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