Okay, the question was:
Dears,
We are implementing SAP NW 7.3 AS ABAP on IBM Power System i – IBM i V7R1
The following are the values used for some relevant instance profile parameters :
as4/dbmon/enable = 1
as4/dbmon/classic = 0
as4/dbmon/central_collector = 0
Could someone please guide on how to control the retention period of the statistical data of the SQE plan cache for DB2 on IBM i , which is copied to SAP system tables by SAP system jobs.
The following are SAP links, together with their relevant excerpts :
http://help.sap.com/saphelp_snc70/helpdata/en/0d/ba08f8af7b11d28e1e0000e816c2ff/content.htm
‘The statistics are not deleted automatically. However, you can delete weekly data from the display (second screen). To schedule automatic deletion of the statistics, configure table SAPWLREORG, setting ID to D4 for DB2 UDB for iSeries.’
http://www.stechno.net/sap-programs.html?view=sapprog&id=RSDB4UPD
‘You can delete old data online using transaction ST04, if you have authorization. Alternatively, you can do this in the background by submitting RSDB4UPD using variant SAP&_RSDB4UPD1 (deletes all data older than a week).’
It is really not so clear how exactly is the deletion controlled.
Thank you in advance for your cooperation.
Reda
-------------------------
Hi Reda,
if you use the traditional monitoring (as4/dbmon/central_collector = 0), the SQE plan cache data is kept from one IPL to another, i.e. after each IPL the plan cache data is cleared. The statistical data may hang around for longer periods of time, but this is probably not relevant at all. The second link that you provided is definitely outdated information (was only valid for as4/dbmon/classic = 0, but that setting is not supported with IBM i 7.1).
If you would like to keep historical data from the plan cache, you should consider using the new database performance collector for IBM i (see SAP Notes 1622665 and 1634283) as well as the new DBACockpit that was shipped with 7.02 SP15, 7.30 SP11, 7.31 SP11 or 7.40 SP06.
Kind regards,
Christian Bartels.