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Hi Jeff,
Yes the IMS 14 enhancement will satisfy my RFE.
Our OSAM DBs have gone past 60 extents & we've been able to use IBM batch utilities or batch programs against them with no problems. We've used vanilla unload & load, HP Unload & HP Load, and HP Pointer Checker against them with no problems. Realtime is the only thing that didn't allow access to the OSAM DB with more than 60 extents. We're really glad all your unload & load tools worked against them! That's how we fixed them.
Ann
Dear Ann,
Thank you for your enhancement request for IMS. I've taken a look at the request and I have some additional questions.
With IMS 14 we've changed our internal control blocks to split the OSAM DEDB between 24 bit storage and 31 bit storage. Here is the link to the change in the Release Planning Guide: https://www-01.ibm.com/support/knowledgecenter/SSEPH2_14.1.0/com.ibm.ims14.doc.rpg/ims_v14_osam_24bit_storage_relief.htm This internal change should allow IMS to have a larger number of OSAM extents but we don't think it should reach a number close to 256, perhaps it is closer to 120 now. Would the IMS 14 enhancement satisfy your RFE?
If not can you explain why you believe IMS supports a large number of extends for OSAM? Before IMS 14 the internal logic of IMS should not allow the number of extends to go beyond 60. Unfortunately there have been defects in the code that have allowed IMS to go beyond that limit in the past. Since the limit was bypassed via a defect the results are unpredictable, sometimes a function appears to work externally but internally there are problems. Therefore I am curious of the circumstances you were able to go beyond 60 extents, if it happened because of a defect, a vendor product extending the database data sets, any information you can share.
Thank you for the information.
Best Regards,
Jeff Fontaine
JFontaine@us.ibm.com
IMS Database development