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enq: TM - contention on MV log 11.2.0.3 Version

edited Sep 11, 2012 1:48PM in Database Tuning (MOSC) 12 commentsAnswered
Hi All,

 I'm facing below issue, not sure any one can help or not:

a. We had two Materilaized view, schedule job to FAST refresh every 15 seconds (very frequent), the MV refer to two huge base table.

b. In order to speed up the MV fast refresh, we had enable "parallel dml" for each MV FAST REFRESH session. (PARALLEL DML only enable on session level for MV fast refres, other session will not using parallel dml)

c. We observed after enable parallel on DML ,it cauisng the two MLOG$ table with huge "enq: TM - contention " wait event.

MV FAST REFRESH, when enable parallel DML, insert statement are with "NOAPPEND", i'm not sure the high "enq: TM - contention " on MLOG table is normal or not.

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