Re: BUG #2225: Backend crash -- BIG table

Patrick Rotsaert <patrick(dot)rotsaert(at)arrowup(dot)be> writes:
> I did a vacuum analyze, now the explain gives different results.

> pointspp=# explain select trid, count(*) from pptran group by trid
> having count(*) > 1;
> QUERY PLAN
> --------------------------------------------------------------------------------
> GroupAggregate (cost=9842885.29..10840821.57 rows=36288592 width=18)
> Filter: (count(*) > 1)
> -> Sort (cost=9842885.29..9933606.77 rows=36288592 width=18)
> Sort Key: trid
> -> Seq Scan on pptran (cost=0.00..1039725.92 rows=36288592
> width=18)
> (5 rows)

OK that looks more reasonable.

> pointspp=# select trid, count(*) from pptran group by trid having
> count(*) > 1;
> ERROR: could not write block 661572 of temporary file: No space left on
> device
> HINT: Perhaps out of disk space?

> I have 5.1GB of free disk space. If this is the cause, I have a
> problem... or is there another way to extract (and remove) duplicate rows?

Time to buy more disk :-(

regards, tom lane