Hi all
Recently my client complains about oracle 12C(12.1.0.2.0) slow running. Then i did awrrpt, _latch free_ ranks first in _Top 10 Foreground Events by Total Wait Time。_So i checked the _Latch Sleep Breakdown_, found that there are too many misses in _①space background task latch ②row cache objects ③Result Cache: RC Latch ④shared pool_. But i cannot find any information about _space background task latch_.
Can anyone tell me how to do next to solve the problem. Thanks a lot.
