Rich look in metric_daily or metric_hourly ... target name should be your db target, target_type = 'database', metric_name = 'instance_efficiency' and key_value like 'lib%' ... (check rest of key_values for more info) then you want info from average/minimum/maximum/std_dev columns ... metric_daily will contain data rolled up by day, metric_hourly will have data rolled up by hour. Fastest access you will get into metric_Daily or metric_hourly views is via target_guid .. which you can get by selecting from mgmt_target view. As for latch waits , you will probably find more info in AWR (as much as contained in its history tables). Raj On Wed, May 5, 2010 at 12:57 PM, <lyallbarbour@xxxxxxxxxxxxxxx> wrote: > You can see it in Grid. Both with AWR and ADDM -- AND -- with the > Historical view. Anything under Concurrency will show the latch waits. > I don't understand why you are digging through the tables. :) > > >