How to load a plan from the AWR into the SMB

To load a plan found in an AWR snapshot into the SMB, you need to add it to an STS first, then load it into the SMB.
Here is how:

1. create an empty STS:

exec dbms_sqltune.create_sqlset(sqlset_name=>'mysts');

2. Note the snapshots where your plan was recorded, and add the plans to your STS:

DECLARE
  my_cur  dbms_sqltune.sqlset_cursor;
BEGIN
  OPEN my_cur FOR
     SELECT VALUE(x)
     FROM   TABLE( dbms_sqltune.select_workload_repository(begin_snap=>5840, 
                                                           end_snap=>5841, 
                                                           basic_filter=>'sql_id = ''45wmakdh9ak9s''')) x;

     dbms_sqltune.load_sqlset(sqlset_name => 'mysts', populate_cursor => my_cur);
END;
/

You can now check your STS for its contents:

select sqlset_name,
     sql_id,
     plan_timestamp,
     parsing_schema_name "schema",
     plan_hash_value,round(elapsed_time/1000000) "duration in seconds",
     cpu_time,
     buffer_gets,
     disk_reads,
     executions
from   dba_sqlset_statements
where  sqlset_name = 'mysts'
;

SQLSET_NAME	SQL_ID	PLAN_TIMESTAMP	schema	PLAN_HASH_VALUE	duration in seconds	CPU_TIME	BUFFER_GETS	DISK_READS	EXECUTIONS
mysts	45wmakdh9ak9s	11.09.2018 15:22:13	SH	3827183161	0	0	0	0	0
mysts	45wmakdh9ak9s	06.09.2018 16:45:26	SH	4026264003	579	85550842	24062750	101808	3278857

We can see from the output that there are actually two different plans in the STS now, one with plan_hash_value=3827183161 and another one with plan_hash_value=4026264003.

In my case I wanted only the one with plan_hash_value=3827183161.

3. Finallly, load the contents of your STS into your SMB:

VARIABLE cnt NUMBER
EXECUTE :cnt := DBMS_SPM.LOAD_PLANS_FROM_SQLSET( -
                    sqlset_name=>'mysts', basic_filter=>'plan_hash_value=3827183161', sqlset_owner=>'SYS');

print :cnt;