Re: Control File locks

There are two locks: a read lock and a write lock. So most of the times when you read the Controlfile you will get the CF enqueue in mode 4. If you update the control file, you get it in mode 6. Now the reasons why could be plenty but most likely to identifying or re-identifying database files

Anjo.

"Gogala, Mladen" wrote:

> I noticed that my users are occasionally (once or twice a day)
> acquiring a 'CF' lock.According to the oracle reference, 'CF' lock is
> a Control File lock. Does anyone knowwhy would users acquire a 'CF'
> lock, or in one case, even a 'IS' (Instance State) lock? What
> situation can lead to that?

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Anjo Kolk
  INET: anjo_at_oraperf.com

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