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IDS Forum

Re: Performance loss for a query after 11.50 >12.1

Posted By: Cesar Martins
Date: Wednesday, 24 May 2017, at 12:07 p.m.

In Response To: Performance loss for a query after 11.50 >12.10 up (ERIC VERCELLETTO)

Forgot mention...

We open a PMR and the IBM support identify why this happen and suggest this
solution .

2017-05-24 13:03 GMT-03:00 Cesar Martins <cesar.inacio.martins@gmail.com>:

> Hi Eric
>
> I get into similar situation here at the last week.
> Probably your situation isn't the same we had here....
>
> Since as you wrote : "...and more funny things..." , I will share...
>
> Here we migrate our production from 11.50.FC9XW to 12.10.FC8W1 .
> Then a program which run over 1h30min , goes to +24h and not finish...
>
> The issue was functional index + remote access ...
> The SQL involves tables from different databases and at the WHERE clause
> use a function which is a functional index at the remote table (other
> database at same instance).
>
> At version 11.50 the query run in 0.00sec (yes is
> practically instantaneous) , at version 12.10 run +8 seconds...
> (the program run this query +100 times per second)
>
> This function is some "generic" at our system and exists at both databases
> (local and remote).
> At where clause doesn't specify the database at the call of function ,
> something like :
> ---
> from local_table a , dbB:remote_table b
> where a.id = myfunc(b.field2)
> --
> at version 11.50 , they recognize the functional index for
> dbB:remote_table and use it.
> at version 12.10 , they use the local index , because it have the same
> name ... so, the engine not use the functional index.
> the solution, change our application and include the database at function
> call :
> ---
> from local_table a , dbB:remote_table b
> where a.id = db2:myfunc(b.field2)
> --
>
> then the query plan at 12.10 backs equals of 11.50
>
> Bests regards
> Cesar
>
>
> 2017-05-24 12:35 GMT-03:00 ERIC VERCELLETTO <eric.vercelletto@begooden-it.
> com>:
>
>> Hi all,
>>
>> we just completed an offplace migration from 11.50 to 12.10 FC8W1. This
>> instance is mainly intended for DWH, size reaching 0.7 Tb
>>
>> Migration ran well, but we now have a severe performance loss on one very
>> complex query, which ran formerly in about 120 seconds on 11.50, and that
>> I
>> have to abort after 2 hours although not completed.
>>
>> - Update statistics are done accurately for each table involved in the
>> query
>> - the tables involved are not very big ( all less than 100,000 records)
>> - I won't list the query here because it is 7 'A4' format pages long(no I
>> didn't write this query...)
>>
>> the Buffer POOL is 25Gb+, SHMVITSIZE is comfortable, tempdbs is
>> comfortable
>> too, discs are not bad. User is alone in instance when running the query.
>>
>> I am aware that the optimizer has important changes starting 11.70, and
>> that
>> setting SET OPTIMIZATION OPT_SEEK_FACTOR '0' may be a solution for queries
>> showing those symptoms after that kind of migration. (It actually solved a
>> problem at another customer's, it did magic)
>>
>> I won't show the query here because, yes, it is totally ununderstandable
>> and
>> unmaintainable, first reaction after finishing to read it "OUCH! that
>> hurts!"
>> but it worked perfect in 11.50.
>>
>> The query plan involves a lot of temp tables dynamic creation, LEFT join
>> on
>> sub SELECT statements and more funny things. tables size are not
>> enormous, but
>> there are 16 tables or dynamically created tables. Kind of difficult to
>> optimize.
>>
>> Considering that what worked well on 11.50 is supposed to work as well or
>> even
>> better in 12.10, is there any other 'magic' (i.e magic setting or
>> parameter)
>> that could fix the issue ?
>>
>> I am also waiting for the original query plan in 11.50, which is in
>> another
>> company, thus not easy and fast to obtain.
>>
>> This last call is before creating a PMR ...
>>
>> Thanks for any magic light :-)
>> Eric
>>
>>
>> ************************************************************
>> *******************
>> Forum Note: Use "Reply" to post a response in the discussion forum.
>>
>>
>

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