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 ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------