Caching in PostgreSQL

Hi,

Can anybody tell me how can I implement data Caching in the
shared memory using PostgreSQL.

For one of the projects we are using Postgres version 8.0.3 and
were planning to support table partitioning in order to improve the DB
query/update performance but, it will be very much helpful if anybody
can tell me whether data cache is possible in Postgres.

We also, need to know if the DB view is kept in the DB Managers program
memory or in the shared memory of the processor. If it is in the shared
memory, we only need to know the shared memory address/name so that we
can access. If not in shared memory then we need know whether it is
possible to make the postgress to store the DB view in shared memory.

Thanks in Advance,
Ram.

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