To check if your database started by using spfile or pfile
show parameter spfile
To check the location of control files
show parameter control_files
shutdown immediate
startup nomount
rman target / catalog rman/rman@RMAN
To restore control file from file system to ASM
restore controlfile to '+DATA’ from '/u01/app/oracle/product/12.1.0.2/db_1/dbs/controlfile_standby.ctl';
You can run again to multiplexing control file
restore controlfile to '+DATA’ from '/u01/app/oracle/product/12.1.0.2/db_1/dbs/controlfile_standby.ctl';
you have to check in ASM de location and name of new control file
alter system set control_files='+DATA/STANDBY/CONTROLFILE/current.314.951762205','+DATA/STANDBY/CONTROLFILE/current.327.951762257' scope=spfile;
startup
show parameter control_files
