[oracle@primary01 ~]$ srvctl stop database -d compdb
[oracle@primary01 ~]$ srvctl start database -d compdb -o mount
[oracle@primary02 ~]$ sqlplus / as sysdba
...
SQL> ALTER DATABASE FORCE LOGGING;
Database altered.
SQL> ALTER DATABASE ARCHIVELOG;
Database altered.
For reflecting and tracking all the changes on the primary database and transport these changes to the standby database, FORCE LOGGING and ARCHIVELOG mode must be enabled.