EM12c false alarms for blocking locks

From: Rich Jesse <rjoralist2_at_society.servebeer.com>
Date: Mon, 20 Aug 2012 08:23:47 -0500 (CDT)
Message-ID: <5ab283232b6584fb3007024904a3695e.squirrel_at_society.servebeer.com>

Hey all,

Lately EM12c has been alarming me with false alarms on the Blocking Session Count metric. It's collecting the metric every minute and even though I keep cranking up the "Number of Occurrences" value from 1, 2, 3, and 5, it still keeps alarming a few times per day (and night!).

The target DB has never had a locking issue. And when I investigate the new block, it's gone. The offending processes are everything from LGWR, PQs, and regular user sessions. It seems like it's alarming for some "benign" lock (e.g. shared) and ignoring the number of occurrences. It's also only started since I installed the BP1 EM12c patch, although not immediately after the install. I just upgraded the target DB from to (yay!), and there's no change in the pattern.

Anyone else seeing this? I've got too many SRs open already... :)

TIA! Rich

Received on Mon Aug 20 2012 - 08:23:47 CDT

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