IBM Data and AI Ideas Portal for Customers


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Db2 for z/OS

Showing 975

Performance improvement for sync i/o

A track that is not fully formatted is not eligible for sync i/o (zHyperLink). With the existing code, DB2 sends sync i/o request to all tracks, even ones that are not fully formatted. These i/o get rejected and retried as transport mode. I'd like...
almost 2 years ago in Db2 for z/OS 0 Not under consideration

Add another counter to indicate that access was allowed due to install SYSADM authority rather than modifying the existing PKG-AUTH UNSUCC-CACHE counter behavior

If Installation SYSADM is used for EXECUTE authority on a package, the entry is not cached in the CACHEPAC area. However, the PKG-AUTH UNSUCC-CACHE count will be incremented even though the Installation SYSADM ID is not being cached in the CACHEPA...
almost 2 years ago in Db2 for z/OS 2 Not under consideration

UNION should automatically be rewritten to "UNION ALL" when it is logically equivalent

In the following query, the developer coded "UNION". Because it is part of a "WHERE EXISTS" subselect, replacing the UNION with "UNION ALL" will perform much better and deliver the same results: SELECT * FROM PDBR111.VCLI095_SELECT V01WHERE V01.AR...
over 5 years ago in Db2 for z/OS 1 Not under consideration

Temporal Join Capabilities

The table reference syntax for temporal joins needs to be expanded to include effective ways to find rows across the tables that share time affectivity.The FOR BUSINESS_TIME / FOR SYSTEM_TIME syntax does not allow for references to columns from th...
over 12 years ago in Db2 for z/OS 1 Not under consideration

Recover Statistics based on Statistic History Tables

In most cases an up-to-date RUNSTATS will result in better execution plans and SQL performance. But there are also cases, where new statistics result in worser execution plans and performance. For static SQL we have many possibilities to control t...
over 5 years ago in Db2 for z/OS 0 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...
over 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...
over 7 years ago in Db2 for z/OS 1 Not under consideration

Alter Index add column

When altering index adding columns ' the index status change to rebuild pendig ' need to put in in change pending and let appliction use this index until rebuild or reorg the index , and then rebind packeges
about 11 years ago in Db2 for z/OS 0 Not under consideration

IBM Unload to support parallelism for LOB Tablespaces

We are trying to unload large LOB tablespaces in a performant manner. Please see PMR 76429 999 866 in relation to this. IBM Unload currently issues misleading messages saying parallelism will be invoked. However this is not the case and the utilit...
over 5 years ago in Db2 for z/OS 1 Not under consideration

Allow the alteration to another bufferpool (with the same page size) for a specific partition.

When deciding on which bufferpool to place a tablespace in, I have found that different partitions have different requirements. when the "hotspot" of a table (that would benefit by being in a larger bufferpool) is at the end, putting the last part...
over 5 years ago in Db2 for z/OS 1 Not under consideration

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