Re: OUTER JOIN IS SLOW

["Shoaib Mir" <shoaibmir(at)gmail(dot)com>]

....adding to the last email, for now try the work_mem but you should be adding ANALYZE along with the VACUUM (with a cron job I guess) you do regularly.

------------
Shoaib Mir
EntperpriseDB (
www.enterprisedb.com)

On 12/24/06, Shoaib Mir <shoaibmir(at)gmail(dot)com> wrote:

Try increasing the work_mem first to see the change, that might help.

-------------
Shoaib Mir
EnterpriseDB ( www.enterprisedb.com)

On 12/24/06, Benjamin Arai <benjamin(at)araisoft(dot)com> wrote:

I have been running pieces of my PL function by hand and I have found
that the following queries work by themselves taking less than a second
to execute.

getDateRange"('12/1/2005','12/1/2006')  <- simply generates a date
list.  Doesn't even access a table

SELECT * FROM mutualfd_weekday_qbid WHERE cusip='92193920' AND  pkey >=
'12/15/2005' AND pkey <= '12/15/2006';

But when combined as below it takes 10 seconds to execute.

SELECT d1 as date, d2.data as data FROM
"getDateRange"('12/1/2005','12/1/2006') d1 FULL OUTER JOIN (SELECT *
FROM mutualfd_weekday_qbid WHERE cusip='92193920' AND  pkey >=
'12/15/2005' AND pkey <= '12/15/2006') d2 ON d1=d2.pkey;

Do I need to increase the work_mem or is this possible still a ANALYZE
issue?

Benjamin

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