Database Tuning (MOSC)

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enq: UL - contention

edited Jan 3, 2013 9:17PM in Database Tuning (MOSC) 9 comments
Hi,
We are noticing 'enq: UL - contention' in our 2 node 11gR2 RAC database. Could someone shed some light on this?

Top 5 Timed Events                                                    Avg           % Total
~~~~~~~~~~~~~~~~~~                                               wait           Call
Event                                            Waits    Time (s)    (ms)           Time
----------------------------------------- ------------ ----------- ------ -------------
enq: UL - contention                         1           6           6333              2.1

Regards
Rajeev

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