Gaetano Mendola wrote:
> running a 7.4.5 engine, I'm facing this bad plan:
>
> empdb=# explain analyze SELECT name,url,descr,request_status,url_status,size_mb,estimated_start,request_time_stamp
> empdb-# FROM v_sc_user_request
> empdb-# WHERE
> empdb-# login = 'babinow1'
> empdb-# LIMIT 10 ;
> -> Subquery Scan vsp (cost=985.73..1016.53 rows=1103 width=12) (actual time=25.328..1668.754
rows=493loops=31)
> -> Merge Join (cost=985.73..1011.01 rows=1103 width=130) (actual time=25.321..1666.666
rows=493loops=31)
> Merge Cond: ("outer".id_program = "inner".id_program)
The problem to address is in this subquery. That's a total of 31 x
(1668.754 - 25.328) = 50seconds (about).
Since your query is so simple, I'm guessing v_sc_user_request is a view.
Can you provide the definition?
--
Richard Huxton
Archonet Ltd