"Mark Alliban" <[EMAIL PROTECTED]> writes:
> 530MB of swap. top reports that the backends use around 17-19MB on average.
> Are you saying then, that if I have 500 concurrent queries, I will need 8GB
> of swap space?

Something like that.  You weren't expecting to support 500 concurrent
queries on toy iron, I hope.

> Is there any way to limit the amount of memory a backend can
> use, and if there is, would it be a very bad idea to do it?

Can't think of anything very productive offhand.  We have gotten rid of
some memory-leak problems in 7.1, so you may find that the next release
will not need so much memory.  Or perhaps you can rewrite your queries
to not need so much --- can you determine which queries bloat the
backend to that size?

                        regards, tom lane

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