Re: Instrumenting Poor performance

Upendra,

if you have MOS access take a look through note # 290614.1.

If you are only seeing this at specific times of the month check the frequency of the stats collection jobs - note that you must use the ‘Gather% Statistics’ concurrent programs to collect stats and not dbms_stats.

Reporting in EBS is typically based on period - and date. Possible that you just need to refresh stats more regularly around month end processing to ensure that the stats reflect the current month and are not stale.

Regards,

Mark

> On 14 Sep 2018, at 12:54 pm, Upendra nerilla <nupendra_at_hotmail.com> wrote:
>
> Thanks Martin. That helps..
> I have used orasrp and TVD$XTAT, both are great.
> I can generate the trace only when the performance issue pops up in a couple of weeks..
> Wondering if there is anything else that I could look into while waiting?
>
>
>
> From: Martin Berger <martin.a.berger_at_gmail.com>
> Sent: Thursday, September 13, 2018 4:37 PM
> To: nupendra_at_hotmail.com
> Cc: Oracle-L oracle-l
> Subject: Re: Instrumenting Poor performance
>
> to compile sql_trace files, you can use tools like
> tkprof
> orasrp <http://www.oracledba.ru/orasrp/>
> TVD$XTAT <https://antognini.ch/2008/10/introduce-tvdxtat/>
> Method-R Profiler <https://method-r.com/software/workbench/>
> there are others also.
> This should give you a good starting point where and why time is spent sometimes.
>
> hth,
> berx
>
> Am Do., 13. Sep. 2018 um 22:04 Uhr schrieb Upendra nerilla <nupendra_at_hotmail.com <mailto:nupendra_at_hotmail.com>>:
> is it always the same SQL_ID?
> You an enable sql_trace for this particular SQL:
> alter system set events 'sql_trace[sql: <SQL_ID>] level=12';
>
> It is always the same sql_id. We have a 10046 and 10053 trace for the good execution.. Waiting for the next poor execution to capture the traces again..
>
> I assume EBS can enable tracing for specific activities, but I'm not close to EBS, but maybe there are better solutions than simple sql_trace.
>
> I am not an EBS guy, so I am at a loss here. :(
>
> Do you have proper facility to create a profile based on these sql_trace files?
>
> There is already a sql_profile created for the sql_id. Is that what you mean?
>
>
> From: Martin Berger <martin.a.berger_at_gmail.com <mailto:martin.a.berger_at_gmail.com>>
> Sent: Thursday, September 13, 2018 3:52 PM
> To: nupendra_at_hotmail.com <mailto:nupendra_at_hotmail.com>
> Cc: Oracle-L oracle-l
> Subject: Re: Instrumenting Poor performance
>
> Hi Upendra,
>
> is it always the same SQL_ID?
> You an enable sql_trace for this particular SQL:
> alter system set events 'sql_trace[sql: <SQL_ID>] level=12';
>
>
> I assume EBS can enable tracing for specific activities, but I'm not close to EBS, but maybe there are better solutions than simple sql_trace.
>
> With the traces of different "good" and "bad" and see where the time is spent.
>
> Do you have proper facility to create a profile based on these sql_trace files?
>
> br,
> berx
>
>
>
> Am Do., 13. Sep. 2018 um 21:11 Uhr schrieb Upendra nerilla <nupendra_at_hotmail.com <mailto:nupendra_at_hotmail.com>>:
> Hello Team -
> We have an EBS application which is running EBS and several other modules (OTC). From time to time I see a particular query giving poor response time. Normal response is <4 mins and during the poor execution, it goes over an hour.
>
> We have a SQL baseline created for that SQL_ID and forcing the optimal plan. We are able to see that optimizer is using the same hash. There are no host resource (cpu/memory/io) constraints.. This job runs only a couple of times a day, very time sensitive for the business. We are unable to reproduce this at lower environments even when we performed refreshes..
>
> We see a pattern that this issue shows up during the first week of the month and disappears after a couple of days (not the same exact day).
> Here is what I am thinking of gathering - high level info..
> Gather daily row count of all the tables involved in the query..
> Review the jobs and see if there is anything unique..
> What else could I gather to troubleshoot this further?
> Appreciate any insights..
>
> Thank you
> -Upendra

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