I have a fairly large table (21M) records. One field of type varchar(16) has some duplicate values, which I'm trying to identify. Executing select dup_field from dup_table group by dup_field having count(*) > 1 errs with Out of Memory error. Server has 4GB memory, the backend-process errs after 3.7GB consumed. Is there any work-around that I may use to get this duplicates? Explain output: "HashAggregate (cost=881509.02..881510.02 rows=200 width=20)" " Filter: (count(*) > 1)" " -> Seq Scan on lssi_base (cost=0.00..872950.68 rows=1711668 width=20)" Why is the hash eating so much memory? A fast calc of the memory occupied by this data is less than 512MB. TIA, -- Werner Bohl <WernerBohl@xxxxxxxxxxx> IDS de Costa Rica S.A. ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to majordomo@xxxxxxxxxxxxxx
