Re: Quere keep using temporary files

rihad <rihad(at)mail(dot)ru> writes:
> Hi, we frequently run many query involving XML that use a smallish
> temporary file, despite having increased local work_mem in that
> transaction to 16GB. FreeBSD's top shows that the memory isn't actually
> being used - it remains free. Basically many such queries are run within
> a single transaction:

> LOG:  temporary file: path "base/pgsql_tmp/pgsql_tmp92452.1079", size 166518
> STATEMENT:  DELETE FROM "foo" WHERE ((col1, col2, col3) in (select col1,
> col2, col3 from foo_xml_v2('<here goes xml-formatted blob>'))) AND
> "foo"."col_id" IN ($1, $2, $3, $4, $5, $6, $7, $8, $9)

> It looks like increasing work_mem doesn't help. Surely 16GB is enough to
> cover all these small temp files?

You'd need to provide a lot more detail about what that query is doing
for anyone to be able to guess where the temp file usage is coming from.

regards, tom lane