Automatic failback of an Orace RAC database Service - 19c new feature

When a rac database instance fails, a service which is running on this failed instance (configured as preferred) will fail over to the available instance to continue application connectivity. Wheh the failed instance restarted again, Unfortunately, the service did not fail back to the original (preferred) instance as soon as the instance is up. So a DBA need to relocate the service again. This has changed with Oracle RAC Database 19c with a feature called "failback -yes" option. 

Oracle's Autonomous Health Framework

AHF (Oracle Support Doc ID 2550798.1) is Oracle's current diagnostic tool which includes Orachk and TFA (Trace File Analyzer).

How to see EXADATA machine information on OCI GEN-2 Cloud (EXACC / EXACS)?

To see EXADATA machine information of OCI cloud, follow below method. 1) Log in to EXACS/EXACC compute (db server) node with ROOT user. 2) Navigate to below location. cd /opt/oracle.SupportTools/onecommand 3) fire below command cat em.param | grep machinemodel