"Matt Magoffin" <postgresql.org@xxxxxxx> writes: > I have a SELECT query that causes an out-of-memory error on my production > Postgres 8.3 server. 8.3.which, and what exactly is the query and its EXPLAIN plan? > I believe the culprit is from the sort in the query, No, the problem seems to be here > ExecutorState: 841031232 total in 51159 blocks; 1712232 free (56 > chunks); 839319000 used and it's impossible to guess what that's about without a lot more details than you provided. The sort's only eating 28MB: > TupleSort: 28303408 total in 13 blocks; 5346944 free (14 chunks); > 22956464 used regards, tom lane