Michael_D. 1100004WAH Visits (4486)
PTF UK91435 (APAR PM79520)
is required for DB2 10 for z/OS customers in a Data Sharing environment
PTF UK91435 is required for DB2 10 for z/OS customers
Michael_D. 1100004WAH Visits (2887)
In preparation to DB2 10 migration there is a need to answer the question if DB2 tooling will support the full functionality of a given DB2 version or will it tolerate the new version and worse if it will not support the new version. Mainly this will be most important if new functionality are effectively used and if the migration of a given DB2 environment completed the conversion to new function mode ( DB2 10 NFM ). Nevertheless, is is also important to watch and maintain the DB2 10 maintenance level to answer the question supported or tolerated.
This table provides information regarding DB2® Tools support for DB2® 10 for z/OS.
For more information on which new functions of DB2 10 are utilized by any specific product, or to find out about DB2 10 compatibility for products or releases not included in this matrix, please contact your IBM Customer Service Representative.
Michael_D. 1100004WAH Visits (3989)
Customers running with DB2 10 NFM have noticed that table spaces associated with the DB2 directory data base or catalog (DSNDB01 and SPT01) experience significant space growth resulting from BIND/REBIND operations, DDL, utility activity (Reorg). The only way customer could sustain the issue was by frequently scheduling reorgs on the DB2 directory and catalog in DB2 10 NFM.
Updated list of APARs for excessive SPT01/DBD01 growth – Base and LOB tablespaces - including related Utility APARs in this area!
DB2 10 NFM Cat/Dir SPT01/DBD01 excessive growth
APAR PM66874 to resolve: LOB integrity abend during REORG of DBD01.
DB2 10 NFM Cat/Dir SPT01/DBD01 excessive growth related
APAR PM68842 to resolve: REORG abend. Broken aux index.
PM81189: MSGDSNT217I ON REBIND PACKAGE SWITCH AND NO ROW IN SYSIBM.SYSPACKCOPY IN V10 NFM FOR PACKAGE THAT USES CGTT
timmzzz 060000RTR7 Visits (2971)
Customer X experienced problems after migrating to DB2 10 NFM. Selected packages where rebound right after the migration. PLANMGMT EXTEND as the default in V10 NFM, shouldallow to return to prior access path if needed.
However, for some packages the old access path could not be reverted even under PLANMGMT EXTENDED.
The reason behind this are Created Global Temp Tables (CGTT). They do have a dependency on SYSPKAGE . During ENFM, when SYSPKAGE is dropped, all packages containing CGTTs
When running a REBIND in DB2 10 NFM, REBIND will return an error message and no previous copy is stored.
Please refer to APAR PM81189 for further details on this problem.
agburke 060001QPDN Visits (3437)
CPU increase is always a customer concern, expecially when it occurs across a release boundary. Many of our customers in DB2 10 have seen a CPU reduction in the DB2 address spaces, and much of this can be attributed to the zIIP eligibility of asynchronous reads/ writes. However there have been some circumstances where the new monitoring or storage allocation behavior has affected CPU negatively.
Here are some APARs to address CPU degredation at the address space level.
PM56363 (HIPER): DIST TCB time increase due to remote SIGNON requ
agburke 060001QPDN Visits (2908)
As you may remember we published the workfile recommendations in informational APAR II14587.
This had to do with the SECQTY attribute and whether or not you set the WFDB
In DB2 10 we allow partition by growth table spaces in the workfile database, and these should be the 'most preferred' when it comes to DGTTs.
Here are 2 APARs that have to do with this functionality in DB2 10.
PM65767: DB2 10 NFM work file separation algo
agburke 060001QPDN Visits (3173)
First is the Red Alert for PM51093 that was recently posted on the Red Alert website: http
Other potential data loss HIPERs include:
Correction: APAR remains open. Corrective relief, AM55070, is available from DB2 Technical Support. The estimated PTF availability date is April 6.
Notes: This is a problem specific to freespace reuse and later rollback. There should be no latent data corruption. i.e. the only way a customer would have data corruption is if they actually encountered an abend during rollback, in which case the page would be marked broken and they should report the problem to IBM Support.
There is no need for customers to proactively check for problems. If such is desired, then any utility such as DSN1COPY, REORG, COPY or any application access would report a page marked broken.
Correction: PTF UK76352 is available (not yet RSU)
Notes: There is no actual data loss, however, the potential exists for corrupted data pages and orphan pointer records. Customers wishing to proactively check for this condition can use DSN1COPY with the CHECK option, which runs offline and is non-disruptive.
However, the IBM COPY utility would automatically detect corrupted data pages, so a normal backup cycle should be sufficient to validate data. If DB2 detects a problem, then the page may be marked broken. This can be reset by REPAIR using REPAIR LOCATE db.ts PAGE(nnnn) RESET. The IBM REORG utility will correct the page corruption.
Michael_D. 1100004WAH Visits (3791)
DB2 10 can reduce the total DB2 CPU demand from 5-20% when you take advantage of all the enhancements. Many CPU reductions are built in directly to DB2, requiring no application changes. Some enhancements are implemented through normal DB2 activities through rebinding, restructuring database definitions, improving applications, and utility processing. The CPU demand reduction features have the potential to provide significant total cost of ownership savings based on the application mix and transaction types.
Improvements in optimization reduce costs by processing SQL automatically with more efficient data access paths. Improvements through a range-list index scan access method, list prefetch for IN-list, more parallelism for select and index insert processing, better work file usage, better record identifier (RID) pool overflow management, improved sequential detection, faster log I/O, access path certainty evaluation for static SQL, and improved distributed data facility (DDF) transaction flow all provide more efficiency without changes to applications. These enhancements can reduce total CPU enterprise costs because of improved efficiency in the DB2 10 for z/OS.
DB2 10 includes numerous performance enhancements for Large Objects (LOBs) that save disk space for small LOBs and that provide dramatically better performance for LOB retrieval, inserts, load, and import/export using DB2 utilities. DB210 can also more effectively REORG partitions that contain LOBs.
This IBM Redbooks® publication® provides an overview of the performance impact of DB2 10 for z/OS discussing the overall performance and possible impacts when moving from version to version. We include performance measurements that were made in the laboratory and provide some estimates.
Keep in mind that your results are likely to vary, as the conditions and work will differ.
In this book, we assume that you are somewhat familiar with DB2 10 for z/OS.
See DB2 10 for z/OS Technical Overview, SG24-7892-00, for an introduction to the new functions.
Michael_D. 1100004WAH Visits (3375)
Higher CF CPU utilization in a DB2 10 for z/OS data sharing environment during Delete_Name processing. Delete_Name requests/sec can be significantly higher in DB2 10 for z/OS than in DB2 9 for z/OS. In V10, when the pageset/partition becomes non GBP dependent, the Delete_Name process deletes only data entries to avoid cross invalidation processing at that time, and to allow cleanup of the directory
entries later when other pages are registered. The V9 Delete_Name process deleted both data and directory entries. In DB2 10 for z/OS, the Delete_Name requests/sec can be significantly higher because CFCC processing is not as efficient when only data entries are deleted.
PM51467: CF DELETE_NAME PERFORMANCE IN DB2 10 FOR Z/OS http
Michael_D. 1100004WAH Visits (5792)
PM24723: IFCID 225 REAL STORAGE STATISTICS ENHANCEMENTS IFCID225
DB2 APAR PM24723 is very important and supports REAL STOARAGE monitoring issue via a new extension to IFCID 225
See z/OS APAR z/OS APAR OA37821 and corresponding DB2 APAR PM49816 for this issue
OA37821: NEW FUNCTION IARV64 REQUEST=COUNTPAGES SUPPORT FOR UNSERIALIZED PROCESSING.
Useful commands monitoring the use of 1MB size real storage page frames on z10 and z196 :
DISPLAY BUFFERPOOL(BP1) SERVICE=4
Display provides output via DSNB999I messages of how many 1MB size page frames are being used
This z/OS command shows the total LFAREA, allocation and splits it across 4KB and 1MB size frames, via IAR019I message
Michael_D. 1100004WAH Visits (6553)
Michael_D. 1100004WAH Visits (4048)
PM42528: SUPPORT FOR DELETING A MEMBER FROM A DATA SHARING GROUP
To use this support:
- The APAR or PTF providing delete member support must be applied to all members. Since deleting a member requires all members to be stopped, there is no pre-conditioning APAR / PTF.
- The member being deleted must be quiesced with no outstanding units of work, active utilities or retained locks.
- There should be no objects in restricted states. Use the -DISPLAY DATABASE(*) RESTRICT to verify.
- All surviving members must be DB2 10 New Function Mode
- The member to be deleted must be quiesced at some point before the surviving members are stopped so that the quiesced state is saved in all the surviving members' BSDSs.
- Stop all members of the data sharing group.
- Make backup copies of all BSDSs.
- Run the change log inventory (DSNJU003) DELMBR control statement against all the group members' BSDSs to deactivate the member that is to be deleted.
- Restart the surviving members of the group.
- When the logs of the member to be deleted are no longer needed, proceed.
- Stop all members of the data sharing group.
- Make backup copies of the BSDSs.
- Run the change log inventory (DSNJU003) DELMBR command against all the group members' BSDSs to destroy the member that is to be deleted.
- Restart the surviving members of the group.
- After all surviving members have been restarted, the logs and BSDS of the deleted member are no longer needed.
DELETE data sharing member related APAR's and PTF's
APAR : PM31003, PM31004, PM31006, PM31009
PTF : UK67512, UK67958, UK69286, UK65750