Re: index scan

Die, Richard.

Thank you for answer March, 21 2005 14:15:40:

RH> Mihail Nasedkin wrote:
>> xxxx=# explain select * from sites s join site_screens ss on
>> s.oid = ss.id_site; QUERY PLAN
>> ---------------------------------------------------------------------------
>> Hash Join (cost=...)
>> Hash Cond: ("outer".id_site = "inner".oid)
>> -> Seq Scan on site_screens ss (cost=...)
>> -> Hash (cost=...)
>> -> Seq Scan on sites s (cost=...)

RH> You've commented out the interesting bits (the costs/rows)
In that example main point - Seq Scan on site_screens

>> I want to Index Scan. What must I do?

RH> Why do you want an index scan? Do you have any evidence it will be
RH> faster than a sequential scan?

No, but I want to be ready for make Index scan queries in future. I
make first steps on the customize SQL.

Where I can read more about optimize the SQL-queries and about
differences between types of scan?

--
Regards,
Mihail Nasedkin
m(dot)nasedkin(dot)perm(at)mail(dot)ru