Weekend Learning: Master reference note for "CPU time" wait events

If you have ever looked at what your database is doing in either a real time fashion, or via ASH/ADDM reports, then you have obviously seen wait events referencing the CPU and that does not mean there is a problem with the CPU or even with the database, but for the times when you are not sure make sure you have favorited the document ""DB CPU" / "CPU + Wait for CPU" / "CPU time" Reference Note" in My Oracle Support note 1965757.1 so you have a one-stop shop at your fingertips!  This would also be useful too, if you wanted to utilize it to check out possible issues when upgrading your database version or adding new features!

R12.1.3: Internal Concurrent Manager does not manage processes correctly after CPU patches applied

Regardless if you have already applied the CPU patch which causes this or not, you need to prepare for the potential to encounter the "Concurrent Managers Are Not Going Down Properly After Appling Patch 16735285 in R12(12.1.3)" issue reported in MOS document ID 2063862.1 after any change so make sure you add this to your test cases immediately!  You could also have another take away by finding out more about the Concurrent Managers by looking up the package FND_CONC_RAC_UTILS reported in the error message to see if there are other procedures that maybe you could utilize in the future!!