Turns out that all I had to do is set one ini file entry to a non-default value.
UPDATE QUSRSYS/QAQQINI SET QQVAL='*ONLY_REQUIRED' WHERE QQPARM ='REOPTIMIZE_ACCESS_PLAN'
Now all 300 SQL requests complete in just under 5 seconds.
That's so blindingly fast that even after writing a C program that runs them all simultaneously via IBM's multi-thread API it still can't do it any faster than 5 seconds.
I'm looking for a reason why I should use a library other than QUSRSYS since it may be that all SQL requests from any other jobs may benefit as well.
Peter
-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of CRPence
Sent: Saturday, 1 June 2013 6:48 a.m.
To: midrange-l@xxxxxxxxxxxx
Subject: Re: Performance question and SQL SERVER
On 29 May 2013 13:10, Peter Connell wrote:
Tried that. DEBUG shows that the ODP is deleted as soon as you SQL
delete the records.
The /fastdelete/ feature will effectively DROP the TABLE just like how one might DROP and CREATE of a work file. Avoid or disable [as I recall, there is an INI option\setting] that fast-delete feature for that DELETE request, if the change from DROP\CREATE to using DELETE effected the same loss of re-use.
I intend to try JDBCR4.
By shifting from the current purely dynamic requests to another purely dynamic interface, I would not expect to see much difference.
<<SNIP>>
Regards, Chuck
Gary Thompson on Thursday, 30 May 2013 7:56 a.m. wrote:
maybe try:
instead of a new work file try same file but use SQL to delete all
rows so you just load/clear/load/clear etc also any suggestions from
System i Navigator index advisor ?
Peter Connell on Wednesday, May 29, 2013 1:48 PM wrote:
<<SNIP>> when a new work file is created for the next client
transaction, these ODPs get deleted and the transaction is slow
again. <<SNIP>>
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