On 10/25/2019 05:49 PM, Tom Lane wrote:
rihad <rihad@xxxxxxx> 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
.
I just checked and saw that the function "foo_xml_v2" above returns
table. Is this enough to trigger temporary file usage regardless of
work_mem?
