Upgrading Oracle database 12.2 to 19.10 came with some surprises, and one of them was the invalid status of the index WRH$_SYSMETRIC_HISTORY_INDEX owned by the user SYS. Rebuilding the index helped only temporarily, so I decided to recreate the index by following the procedure below: — Confirmation of the invalid index: — Action plan: For more information, please check the following MOS notes below: Index WRH$_SYSMETRIC_HISTORY_INDEX Status Unusable (Doc ID 2426391.1)WRH$_SYSMETRIC_HISTORY_INDEX Index Does Not Get Partitioned After Database Upgrade From 12c To 19c (Doc ID 2777641.1)Index WRH$_SYSMETRIC_HISTORY_INDEX Status Unusable (Doc…