IBM Data and AI Ideas Portal for Customers


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Db2 for z/OS

Showing 309

need SQL tuning component

Now, we are using DSM to manage 235 sets of Db2 databases, of which SQL tuning is a more commonly used function for our system administrators and DBAs. We often use the SQL tuning function to optimize the SQL statements running in the production...
over 1 year ago in Db2 for z/OS 0 Future consideration

DB2 Catalog and INDEX COMPRESSION statistics (PAGESAVE and BP_UNUSED)

If an index is compressed, it is documented in DB2 catalog table SYSIBM.SYSINDEXES column called ‘COMPRESS’ Tablespace compression is documented in SYSTABLESPACE and SYSTABLEPART. In both tables with column called ‘COMPRESS’ SYSTABLEPART als...
almost 2 years ago in Db2 for z/OS 2 Future consideration

I would like to force the use of the "DEFER" option on the creation of an index (using Zparm to make it optional).

We have DBAs that at times (accidently) run a "CREATE INDEX" and fail to include the "DEFER" option. This is rather easy to do because the reverse engineering tools fail to create syntax with the "DEFER" option. The creation of indexes can be ve...
over 2 years ago in Db2 for z/OS 0 Future consideration

Dynamic Plan Stability - Option to restabilize an invalidated query missing

We've got several SQL queries stabilized with dynamic plan stability. Reason is to prevent them from getting a bad accesspath. After operations like "ALTER TABLE ... ROTATE PARTITION..." the query is flagged to valid N in SYSIBM.SYSDYNQRY. Than we...
over 1 year ago in Db2 for z/OS 0 Future consideration

RENAME function for tablespaces

the availability of the conversion of multi-table-tablespaces to UTS-PBG tablespaces is restricted to non-UTS tablespaces (source object).I would like to use this functionality to RENAME a tablespace (when the source is already a UTS-PBG TS) - but...
12 months ago in Db2 for z/OS 0 Future consideration

Add a STOP DB2 mode that cancels connected threads, but not internal processes.

We have struggled with getting a "clean" shutdown of Db2 for years. If we try to use STOP DB2 MODE(QUIESCE), Db2 will not stop. Persistent threads from STCs such as CICS regions, WAS Z servants, and ARS CMOD servers do not "end", so they never al...
almost 2 years ago in Db2 for z/OS 0 Future consideration

IPCS DSN1PRNT command via batch

this is related to cases TS005562456 and TS005376027we are able to issue the following IPCS command online:ipcs verbx dsn1prnt 'page(1515E9B4000,E3),format'but it fails with IPCS batchipcs verbx dsn1prnt commands like this should also work with IP...
2 months ago in Db2 for z/OS 0 Future consideration

Option to dictate behaviour regarding deadlock victim selected on deadlocks involving DDL ALTERs

In true 24*7 production environments there is an increasing expectation that simple(on the face of it) DDL changes should be able to break-in concurrent with application workload. In the case of high-arrival rate transactions even at the quietest...
about 1 year ago in Db2 for z/OS 0 Future consideration

Simplify Alter

In Db2 z/OS version 10 Pending Alters/Deferred Alters were introduced. Deferred Alters are not compatible with most Immediate Alters. Deferred Alters need materializing REORG before immediate Alter, or the Immediate Alter has to be run before...
over 1 year ago in Db2 for z/OS 0 Future consideration

FL LEVEL support

In Db2 12 the Functional Level is currently *not* externalized in various places where it most definitely should be. Notably the PLAN_TABLE, IFCID 316 and IFCID 401. If you are attempting tuning you *must* know under which FL level the SQL in ques...
about 4 years ago in Db2 for z/OS 0 Future consideration