Re: [PERFORM] View not using index

[Yves Vindevogel]

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)


<x-tad-bigger>create or replace view vw_document_pagesperjob as
select documentname, eventdate, eventtime, loginuser,
fnFormatInt(pages) as pages
from tblPrintjobs  
order by descpages, documentname ;
</x-tad-bigger>





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

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