Grants needed to run AWR report

These are the minimum grants needed to execute AWR reports.

GRANT SELECT ON SYS.V_$DATABASE TO awr_user;
GRANT SELECT ON SYS.V_$INSTANCE TO awr_user;
GRANT EXECUTE ON SYS.DBMS_WORKLOAD_REPOSITORY TO awr_user;
GRANT SELECT ON SYS.DBA_HIST_DATABASE_INSTANCE TO awr_user;
GRANT SELECT ON SYS.DBA_HIST_SNAPSHOT TO awr_user;