How to enable KRC and KRB tracing on Oracle

If you enabled BCT.

Doc:

 KRC : Recovery Block Change Tracking (krc)  KRC_CHANGES : Recovery Block Change Tracking CHANGES ((null))

KRB_TRACE : Set krb trace options

  KRB : Kernel Backup Restore (krb)     KRB_THREAD                 KRBBPC Thread Switches ((null))     KRB_IO                     KRB I/O ((null))     KRB_INCR                   KRB Incremental Restore ((null))     KRB_PERF                   KRB Performance Tracing ((null))     KRB_BPOUTPUT               Detailed Backup Piece Output ((null))     KRB_BPVAL                  Detailed Block List During Restore Validate ((null))     KRB_FLWRES                 Details on Restore Flow ((null))     KRB_FLWCPY                 Details on krbydd Flow ((null))     KRB_FLWBCK                 Details on Backup Flow ((null))     KRB_FLWUSAGE               RMAN Feature Usage ((null))     KRB_OPTIM                  Unused Space Compression ((null))

Commands:

alter system set events ‘TRACE[krb.*] disk=highest, memory=highest’; alter system set events ‘TRACE[krc.*] disk=highest, memory=highest’;