IBM Data and AI Ideas Portal for Customers


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Db2 for z/OS

Showing 979

DB2 should produce more accurate filter factors (to better optimize queries)

Today, when I have a query with an equals predicate and also an "IN LIST" predicate and both apply to the same table and when I have correctly collected multi-column frequency distribution stats for the two columns involved with these two predicat...
about 7 years ago in Db2 for z/OS 0 Not under consideration

Allow more options on -MODIFY TRACE command

We sometimes get clobbered with processes that generate lots of Db2 accounting records to the point where SMF is overwhelmed in collecting/offloading them. We are able to identify the offending authid with our online monitor, but until we can cont...
almost 2 years ago in Db2 for z/OS 1 Not under consideration

Temporal INSERT syntax for application period temporal tables

We are using application period temporal tables with success. Application period temporal tables and syntax makes it easy to distinguish between the data values and the time dimension of the data.When doing SELECT, UPDATE and DELETE there is a spe...
about 7 years ago in Db2 for z/OS 0 Not under consideration

additional Db2 accounting info when SELECT FROM FINAL TABLE is used

When I use SQL UPDATE then the accounting information is very clear that UPDATE was used. If I wrap that UPDATE with SELECT FROM FINAL TABLE on the outside then the accounting information does not clearly show UPDATE was used. This is tricky and a...
over 3 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

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

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

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

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

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

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