Retrieving historical data from new ST04

Question

In the old ST04, you could get a nice, 3 month daily overview of key measures just by hitting "Previous Days".  I use that in my performance analyses.  With the new ST04, I have no idea how that's done.  From my understanding, the new ST04 should give you historical data if you give an initial snapshot date that's far enough back.  But I see no way to define the initial date as anything but "Database Start".  SAP_COLLECTOR_FOR_PERFMONITOR has been running consistently for months. Programs RSORAHCL and RSORAVSH are scheduled to run hourly every day.  So the history should still be there, and should be accessible.  However, the documentation on the new DBACOCKPIT is very sketchy, as far as I've seen.
Can anyone either point me to some good documentation on this topic, or provide some hints.  I'd very much appreciate it.
Thanks very much.
                                                   Gordon

Answer 1

Stefan,
The system I'm looking at, L6P, is on Basis 7.00 SP 13.  For troubleshooting, I compared L6P to our G8P system , which is on Basis 7.00 SP 15.
One thing I found is that I can select some dates under the "Database Start" and "Up To Now" buttons on G8P, but not on L6P.  I further found that in table TCOLL, RSORAHCL has all 7 days marked in G8P, but no days marked in L6P.  That would explain why I see the dates in G8P, but not in L6P -- I need to flag the days for RSORAHCL in TCOLL.
So now, I know what I need to do to pick dates going back as far as what's in AWR, according to dba_hist_snapshot.  I also see how I can change the snapshot interval and retention periods:
begin
   dbms_workload_repository.modify_snapshot_settings (
      interval => 20,
      retention => 22460
end;
for example.  The data's in minutes, so I'd want interval = 1440 and retention = 902460 for 3 months of daily snapshot data.
However, I still don't see how I can actually see the history.  I go into Statistical Information --> System Summary Metrics, select Metrics Datasource dba-view, and put in the dates I want.  I get a lot of metrics, but I don't see a way to limit them to the sepcific  ones I want (for data buffer hit rate, I think I'll need to get the physical and logical reads).  How can I clean this up to show only what I need?
Thanks very much.
                                                                Gordon