Re: new problem! Is there any Faster workaround ??

A join probably will work best for you.  A quick way
to do an implicit join:

delete from email_bank where email_id = t_a.email_id;

--- Rajesh Kumar Mallah <mallah@trade-india.com>
wrote:
> Hi folks,
> 
> I think there is still  a problem ,
> 
> email_bank contains  ~ 1  million  records  and t_a
> contains 58 records
> both are indexed on email_id ( integer colmn.)  i
> want to remove these 58
> records
> from email_bank  where email_id  in t_a  & 
> email_bank match.
> 
> but the below is still slow !
> 
> 
> explain delete from email_bank where exists (select
> email_id from t_a where
> email_bank.email_id=t_a.email_id) ;
> NOTICE:  QUERY PLAN:
> 
> Seq Scan on email_bank  (cost=0.00..1760313.80
> rows=1009397 width=6)
>   SubPlan
>     ->  Seq Scan on t_a  (cost=0.00..1.73 rows=1
> width=4)
> 
> EXPLAIN
> 
> PS:
> I ran  VACUUM ANALYZE on email_bank and t_a and 
> both are indexed on
> email_id  before
> the explain .
> 
> 
> regds
> mallah.
> 
> 
> Rajesh Kumar Mallah wrote:
> 
> > Hi folks,
> >
> > We require to do below or similar quite often
> >
> > DELETE  from t_a where email in (select email from
> t_b);
> >
> > everyone knows "IN" is pain fully slow currently
> in pgsql
> > is the any fster alternative to above query
> >
> > regds
> > Mallah.
> >
> > ---------------------------(end of
> broadcast)---------------------------
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