On 10/21/07, Rajarshi Guha <rguha@xxxxxxxxxxx> wrote:
>
> > With 8G of RAM, you should start with shared_buffers around 2 - 3G, if
> > you're using a modern version of PG.
>
> I can do that but I'm a little confused. Earlier postings on the list
> indicate that shared_buffers should be about 10% of the system RAM
> and that effective_cache_size can be a large fraction of RAM.
That was true with 7.4 and before because their cache management
wasn't very efficient. With 8.0 and above, PostgreSQL can handle much
larger shared_buffer sizes.
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
