Dear Listers,
Our database in London has tremendous cf enque lock. Since I am new here. I
checked the parameter found the log_checkpoint_interval set to 3200 and
log_checkpoint_timeout set to default (1800 sec). So I suggest to set
log_checkpoint_interval to 100000000 and log_checkpoint_timeout to 0. The
second thing I found we have average log switch is 6 t0 8 per hour. We have
40 redo logs, each of them is 250m. Our log buffer set to 1m. I believe
after we changed the parameter, the control file schema global enqueue lock
should be released. But it get worse, we have 98% control file enqueue lock
now. I think we have too many log switch (9 per hour now)and suggested to
increase the log to 500m, but our principle dba is not convinced, he think
log buffer size should play a more important role.
Any ideas,
Joan
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Author: Joan Hsieh
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