Greg Stark <gsstark(at)mit(dot)edu> writes:
> Dirk Lutzebaeck <lutzeb(at)aeccom(dot)com> writes:
>> Can some please explain why the temp file is so huge? I understand
>> there are a lot of rows.
> Well that I can't explain. 22k rows of width 1361 doesn't sound so big to me
> either.
It was 700k rows to sort, not 22k. The Unique/Limit superstructure
only demanded 22k rows out from the sort, but we still had to sort 'em
all to figure out which ones were the first 22k.
> The temporary table does need to store three copies of the records at
> a given time, but still it sounds like an awful lot.
Huh?
regards, tom lane