IBM Data and AI Ideas Portal for Customers


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Db2 for z/OS

Showing 777

DB2 should optimize queries adequately when are missing or out of date

In V12 it was intended to extend the NPGTHRSH to empty tables and to tables with missing stats. The idea was to pick up the appropriate index which means: if a sort can be avoided choose this one, otherwise pick up the index, which has the most ma...
over 6 years ago in Db2 for z/OS 1 Not under consideration

Audit Policy enhancement for Global Temporary Tables

Audit policies are used frequently for us to track for a month the Group IDs read, write, etc of standard Tables of Type P,C,T. We would like be able to use this ability to Audit use of created Global Temporary Tables of Type G as well. This would...
over 6 years ago in Db2 for z/OS 1 Not under consideration

prohibit alter/create tablespace not logged

Performing create/alter tablespace to be not logged might be considered a security problem.A solution for this can be a new ZPARM or a special privilege (in RACF & Db2) that will prohibit anyone from doing so, even SYSADM/DBADM etc. Another "c...
over 6 years ago in Db2 for z/OS 1 Not under consideration

Unexpected DDF/RRSAF rollup records getting sent to accounting trace started with ASID trace qualification

This RFE is in response to IBM Service Request 64334 082 000. APAR PK12365 caused all DDF/RRSAF rollup accounting records to be sent to any active trace requesting IFCID 3 records regardless of trace qualification. This causes unwanted overhead an...
over 6 years ago in Db2 for z/OS 3 Not under consideration

Joining a temporal table with an archive-enabled table

In DB2 z/OS V11.1, we getting a -20555 SQLCODE when trying to join a temporal table with an archive-enabled table. We were surprised to see it didn't work. The manual talks about those tables being “mutually exclusive”, which to me would mean ...
over 6 years ago in Db2 for z/OS 4 Not under consideration

make SQL cost estimation more accurate

DB2 for z/OS provided cost estimation before execution for each SQL.We can use explain to check that. And DB2 governor (DB2 Resource Limit Facitliy) use the cost estimation for predictive governor. How ever the cpu cost estimation is not correct f...
almost 7 years ago in Db2 for z/OS 1 Not under consideration

ALTER DEFINE NO - REORG to delete all dataset(s)

: I know that there is a change in place now with the newest version to delete unused datasets for a PBG tablespace with a REORG, I was wondering if there might be something in the future where we could ALTER a Tablespace/Index to DEFINE NO and th...
almost 7 years ago in Db2 for z/OS 1 Not under consideration

Push up of local predicat...

In PMR 89848.077.724 you see an example that the DB2 optimizer is not able to push out local predicates that are specified in the correlated subquery to the parent query block. The predicates AND "AVADMIN"."TLORM_DBFE"."MANDANT" = ? AND "AVADMIN"....
almost 7 years ago in Db2 for z/OS 5 Not under consideration

DB2 for z/OS V11 Unneccessary Index Open & Lock

For index scans, DB2 is unnecessarily opening and locking an index partition.
almost 7 years ago in Db2 for z/OS 1 Not under consideration

Improve performance of EXPLAIN

With early versions of DB2 the performance of EXPLAIN was not relevant. Nowadays, where DBAs do thousands of EXPLAINs, the performance and turnaround is getting critical. I think there is room for better performance and throughput of mass EXPLAINs...
almost 7 years ago in Db2 for z/OS 5 Not under consideration

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