Re: View not using index

rvponp=# explain select * from vw_document_pagesperjob ;
QUERY PLAN
------------------------------------------------------------------------
----------------
Subquery Scan vw_document_pagesperjob (cost=82796.59..90149.20
rows=588209 width=706)
-> Sort (cost=82796.59..84267.11 rows=588209 width=74)
Sort Key: tblprintjobs.descpages, tblprintjobs.documentname
-> Seq Scan on tblprintjobs (cost=0.00..26428.61 rows=588209
width=74)
(4 rows)

rvponp=# explain select * from vw_document_pagesperjob limit 10 ;
QUERY PLAN
------------------------------------------------------------------------
----------------------
Limit (cost=82796.59..82796.72 rows=10 width=706)
-> Subquery Scan vw_document_pagesperjob (cost=82796.59..90149.20
rows=588209 width=706)
-> Sort (cost=82796.59..84267.11 rows=588209 width=74)
Sort Key: tblprintjobs.descpages,
tblprintjobs.documentname
-> Seq Scan on tblprintjobs (cost=0.00..26428.61
rows=588209 width=74)
(5 rows)

rvponp=# explain select documentname, eventdate, eventtime, loginuser,
pages from tblPrintjobs order
by descpages, documentname ;
QUERY PLAN
------------------------------------------------------------------------
----
Sort (cost=81326.07..82796.59 rows=588209 width=74)
Sort Key: descpages, documentname
-> Seq Scan on tblprintjobs (cost=0.00..24958.09 rows=588209
width=74)
(3 rows)

rvponp=# explain select documentname, eventdate, eventtime, loginuser,
pages from tblPrintjobs order
by descpages, documentname limit 10 ;
QUERY PLAN
------------------------------------------------------------------------
-------------------------------------
Limit (cost=0.00..33.14 rows=10 width=74)
-> Index Scan using ixprintjobspagesperjob on tblprintjobs
(cost=0.00..1949116.68 rows=588209 width=74)
(2 rows)

create or replace view vw_document_pagesperjob as
select documentname, eventdate, eventtime, loginuser,
fnFormatInt(pages) as pages
from tblPrintjobs
order by descpages, documentname ;

On 13 Jun 2005, at 09:05, Russell Smith wrote:

> On Mon, 13 Jun 2005 04:54 pm, Yves Vindevogel wrote:
>> Still, when I use explain, pg says it will first sort my tables
>> instead
>> of using my index
>> How is that possible ?
>
> Can we see the output of the explain analyze?
> The definition of the view?
>
> Regards
>
> Russell Smith
>
>
Met vriendelijke groeten,
Bien à vous,
Kind regards,

Yves Vindevogel
Implements