It does help, but having a DW-type system, I don't ever see ITL waits. However,
on Scott Gosset's "internals" course, I learned to look into ROW_WAIT_ROW# column of
V$SESSION. If a transaction is waiting on a TX lock and ROW_WAIT_ROW# is 0 or -1,
then the transaction is waiting on an ITL entry. I have never experienced that
in practice and I've never seen type TX and LMODE (requested or granted) = 4.
On 04/07/2004 09:52:53 AM, "Bobak, Mark" wrote:
> Mladen,
> There are certainly cases where TX enqueues can wait on mode 4, that is,
> where REQUEST is mode 4.
--
Mladen Gogala
Oracle DBA
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Received on Wed Apr 07 2004 - 13:42:52 CDT
