new problem! Is there any Faster workaround ??

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)---------------------------
> TIP 1: subscribe and unsubscribe commands go to majordomo(at)postgresql(dot)org