Setup AWR on Standby DB

 Starting with Oracle 12.2, AWR can be configured and run against Standby DB, before that release (since 11gR2) the only option available for having similar data was by generating an ASH report on the Standby DB, which was limited by how much data is still available in the standby instance memory.

Here are the briefed steps of how to set up AWR on the standby DB:

[On Primary]: Unlock user sys$umf

SQL> alter user sys$umf identified by "abc#123#ORCL" account unlock;


[On Primary]: Enable "_umf_remote_enabled" parameter:

SQL> alter system set "_umf_remote_enabled"=TRUE scope=BOTH;


[On Primary]: Create two DB links, from primary to standby and vice versa:

SQL> drop database link PR_TO_STBY;
SQL> drop database link STBY_TO_PR;

SQL> create database link PR_TO_STBY CONNECT TO sys$umf IDENTIFIED BY "abc123" using 'ORCL';
SQL> create database link STBY_TO_PR CONNECT TO sys$umf IDENTIFIED BY "abc123" using 'ORCLSTBY';


[On Primary] Add the primary DB to the new AWR Topology:

SQL> exec dbms_umf.unconfigure_node;
SQL> exec dbms_umf.configure_node ('prim');


[On Standby] Add the Standby DB to the new AWR Topology:

SQL> exec dbms_umf.UNCONFIGURE_NODE;
SQL> exec dbms_umf.configure_node ('stby', 'STBY_TO_PR');

[On Primary]: Create a new Topology:

SQL> exec DBMS_UMF.drop_topology   ('Topology_1');
SQL> exec DBMS_UMF.create_topology ('Topology_1');


[On Primary]: Register the standby database with the topology:

SQL> exec DBMS_UMF.register_node ('Topology_1', 'stby', 'PR_TO_STBY', 'STBY_TO_PR', 'FALSE', 'FALSE');

[On Primary]: Register the Standby DB as a remote DB:

SQL> exec DBMS_WORKLOAD_REPOSITORY.register_remote_database(node_name=>'stby');

If you encountered "ORA-13519": Try to unregister and register the DB again:
SQL> exec DBMS_WORKLOAD_REPOSITORY.unregister_remote_database('stby','Topology_1',TRUE);
SQL> exec DBMS_WORKLOAD_REPOSITORY.register_remote_database(node_name=>'stby');

[On Primary]: Verify the above steps by running these queries:

SQL>     set line 170
    col topology_name format a15
    col node_name       format a15
    select * from dba_umf_topology;
    select TOPOLOGY_NAME, NODE_NAME, NODE_ID, NODE_TYPE from umf$_registration;
    select * from dba_umf_registration;


[On Primary]: Create a Snapshot on the Standby DB:

SQL> alter system archive log current;
SQL> exec dbms_workload_repository.create_remote_snapshot('stby');


To generate an AWR report for the standby DB:

SQL> @?/rdbms/admin/awrrpti.sql


In case of switchover happen between primary and standby you have to do a similar role switch for AWR setup using this command:

SQL> exec DBMS_UMF.SWITCH_DESTINATION(topology_name =>'Topology_1',force_switch=> 'TRUE');


References:
https://www.oracle.com/technetwork/database/availability/redo-apply-2745943.pdf