Timestamp Format Change
There’s an interesting change in the alert.log since Oracle Database 18.104.22.168: The format of the timestamps has changed.
If you compare the timestamps in Oracle 12.1 vs Oracle 12.2 you’ll recognize the change immediately:
|Oracle 12.1||Oracle 12.2|
Wed Feb 08 15:39:29 2017 Database mounted in Exclusive Mode Lost write protection disabled Completed: ALTER DATABASE MOUNT Wed Feb 08 15:39:29 2017 ALTER DATABASE OPEN Wed Feb 08 15:39:29 2017 Ping without log force is disabled. Starting background process TMON
2017-05-29T14:09:17.064493+02:00 Database mounted in Exclusive Mode Lost write protection disabled Completed: ALTER DATABASE MOUNT 2017-05-29T14:09:17.252853+02:00 ALTER DATABASE OPEN