Find / Kill Sessions Running Duplicate SQL with Duplicate Bind Var. Values?

From: Jack Applewhite <jack.applewhite_at_austinisd.org>
Date: Fri, 19 Feb 2016 18:34:08 +0000
Message-ID: <BY1PR0201MB09026D9233DACA7E0B41EB91E6A00_at_BY1PR0201MB0902.namprd02.prod.outlook.com>



Environment: 11.2.0.4 Enterprise on Oracle Linux 5.11.

We have a mix of 3rd Party OTS Apps and home-grown Apps. In both cases we are frequently plagued by impatient Users clicking Go or whatever, launching the same SQL several times in a row. We have no control over the Vendor Apps and we're thumping our Developers on the head frequently to build in some prevention for that, but, of course, they're slow to respond to us.

Often these duplicates chew up lots of CPU because they're inefficient to begin with - slow, which is why Users multi-click. We find them, verify they're duplicates, and kill them, but that's very time-consuming.

I'm trying to craft a query using v$Session and v$SQL_Bind_Capture to do this automatically, looking for duplicate SQL_IDs with duplicate bind variable values. I'm looking to pivot the rows in v$SQL_Bind_Capture to columns for easier comparison. The pivot SQL has to be dynamic, since different SQLs have different numbers of bind variables, but I found an Ask Tom posting on how. I'm thinking that, if I can find these sets of duplicates, I can automatically kill all but the first-launched.

I've Googled and looked around, but am finding nothing about such an automated process. Is there one out there? Am I an idiot for trying to do this?

Any guidance would be appreciated.

TIA



Jack C. Applewhite - Database Administrator Austin I.S.D. - MIS Department
512.414.9250 (wk)

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http://www.freelists.org/webpage/oracle-l Received on Fri Feb 19 2016 - 19:34:08 CET

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