Longrunning jobs/Queries in oracle

Hi ,
How to find long running jobs/queries which are executing less than 6 seconds.
The primary criterion for any operation to appear in v$session_longops is to run more than 6 seconds. I want to find out the queries which are executing more than 1 seconds.
Please suggest.
Thanks in advance.
-Surya

884629 wrote:
I agree with you but still at any point of time if we want to find out the queries which are running more than 4 secs(may be because lot of resources issue) then how we can find out? I hope we can not say 'Its meaningless'.It is totally meaningless. You even originally said you want to look at queries running longer than 1 second for problem queries. Now you want to look at queries running more than 4 seconds for problems.
So are 1 sec queries okay now? And 4+ sec queries not? What made you decide that?
You do not know where to draw the line as you do not where the problem is. A sub-second query can be non-optimally written. A 1 hour query can be optimally written.
So what does the query's time tell you? How can you look at the time and say "+Yep, this 2 second query is okay and this 4 second query needs further investigation+".?
What about the SAME query that gives DIFFERENT execution times? You have very conveniently chosen to ignore this basic behaviour of queries in Oracle. For example:
SQL> select count(*) from all_objects;
COUNT(*)
69465
Elapsed: 00:00:04.96
SQL> select count(*) from all_objects;
COUNT(*)
69465
Elapsed: 00:00:02.88So is the 1st query bad as it is almost 5 seconds? And the 2nd query good as it just over 2 seconds? Where do you draw the line using execution time? And what about the same query falling in falling into both good and bad query time regions?
In Oracle® Database Performance Tuning Guide, section 1.1.2.1 Performance Principles, it says:
+"Tuning is driven by *identifying the most significant bottleneck* and making the appropriate changes to reduce or eliminate the effect of that bottleneck."+
So how do you identify the most significant bottleneck? By looking at something as variable and inconsistent as query time? You are wrong if you think that.

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Edited by: sdmuzdba on Mar 25, 2009 7:10 PM
Edited by: sdmuzdba on Mar 25, 2009 7:13 PM
Edited by: sdmuzdba on Mar 25, 2009 7:24 PM

sdmuzdba wrote:
How to Prepare for a Job Interview of Oracle DBA ?
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CURRICULUM VITAE
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