With this query we can see the time of retention of data for the AWR, the value is rounded to days, also we can see the execution interval snapshots;
SELECT EXTRACT( DAY FROM snap_interval) * 1440 + EXTRACT( HOUR FROM snap_interval) * 60 + EXTRACT( MINUTE FROM snap_interval ) AS "Snapshot (Minutes)", EXTRACT( DAY FROM retention) AS "Retention (Days)" FROM dba_hist_wr_control;
Attention, if value is zero it means that the data will be stored forever.
You can change your retention time with the following command, eg for one day retention (value in minutes);
sql> exec dbms_workload_repository.modify_snapshot_settings(retention => 1440);
HTH – Antonio NAVARRO