How many times Corrective Action (CA) has been executed one year so far ?
SQL> select CA_NAME, count(*) from sysman.MGMT$CA_EXECUTIONS where START_TIME>=sysdate-365 group by CA_NAME order by 1 CA_NAME COUNT(*) ---------------------------------------- ---------- ... .. . EXTEND_TABLESPACE_NORAC 3 EXTEND_TABLESPACE_PDB 16 EXTEND_TABLESPACE_RAC 70 NON-RAC_RMAN_AUTO_BACKUP_ARCHIVELOGS 56 RMAN_AUTO_BACKUP_ARCHIVELOGS 533 ... .. . 10 rows selected.
About view MGMT$CA_EXECUTIONS , Oracle official documentation is here or just click the following link.