On Thu, 2007-11-15 at 17:13 +0000, Gregory Stark wrote:
> DELETE
> FROM atable AS x
> USING (SELECT ctid FROM atable LIMIT 50000) AS y
> WHERE x.ctid = y.ctid;
Have you tried to EXPLAIN this one ? Last time I tried to do something
similar it was going for a sequential scan on atable with a filter on
ctid. The other form using "where ctid = any (array(select ctid
from ..." (see my previous post forwarding Tom's suggestion) was going
for a ctid scan, which should be orders of magnitudes faster than the
sequential scan for big tables and small chunks.
Cheers,
Csaba.
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