Checking Control File Type in Oracle DB: Current or Standby

#How to find if database is Primary or Standby in Oracle SQL> select name,open_mode,controlfile_type from v$database; NAME      OPEN_MODE            CONTROL --------- -------------------- ------- PLUGDB    READ WRITE           CURRENT SQL> select name,open_mode,controlfile_type from v$database; NAME      OPEN_MODE            CONTROL --------- -------------------- ------- PR        MOUNTED              STANDBY