High wait event ‘row cache mutex’ in 12cR2、19c
In Oracle 12.2.0.1.0 (12cR2), “row cache mutex” replaced 12.1.0.2.0 (12cR1) and 11g “latch: row cache objects”, similar to “latch: library cache” substitution by “library cache: mutex X” in the previous release. High waits on “row cache mutex” when looking up user or role information in user row cache (dc_users)
