Justin Pitts wrote:
I don't know if I would call it "terribly" ugly. Its not especially
pretty, but it affords the needed degree of twiddling to get the job
done. Relying on the clients is fine - if you can. I suspect the vast
majority of DBAs would find that notion unthinkable. The usual result of
a memory overrun is a server crash.
It's probably OK in this context: the multiple clients are all instances
of the same perl script, running particular, pre-defined queries. So we
can trust them not to ask a really memory-intensive query.
Besides which, if you can't trust the clients to ask sensible queries,
why can you trust them to set their own work_mem values?
Richard
On Nov 20, 2009, at 4:39 PM, Richard Neill wrote:
Justin Pitts wrote:
Set work_mem in postgresql.conf down to what the 200 clients need,
which sounds to me like the default setting.
In the session which needs more work_mem, execute:
SET SESSION work_mem TO '256MB'
Isn't that terribly ugly? It seems to me less hackish to rely on the
many clients not to abuse work_mem (as we know exactly what query they
will run, we can be sure it won't happen).
It's a shame that the work_mem parameter is a per-client one, rather
than a single big pool.
Richard
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