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IBM Data and AI Ideas Portal for Customers


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Db2 for z/OS

Showing 92

SQL Data Insights - no option to weight attributes for AI_COMMONALITY

For outlier detection weighting single attributes (columns) is key, since attributes in a given dataset negatively affect the outcome of AI_COMMONALITY as tests shown
10 months ago in Db2 for z/OS 0 Future consideration

DDF Start with TCP/IP should be coordinated between Start Listener and Start DDF

During start of DDF inside DB2, DB2 start the Listener for TCP/IP requests and a small timeframe later the DDF. In this timeframe incoming requests are denied with REASON=00D31032 and follow-on errors. As an bypass we do not start DDF automaticall...
almost 2 years ago in Db2 for z/OS 0 Future consideration

Return information about a failed Lock-Escalation to the application

When a Lock-Escalation occurs it is documented by message DSNI031I (Lock Escalation has occurred) in the Db2-Master-Adressspace. But when a Lock-Escalation fails there is no documentation for this, instead it comes to a Timeout or Deadlock from a ...
about 2 years ago in Db2 for z/OS 2 Future consideration

Improve Space Search Performance for Nearly Full PBR

Currently, when there are many concurrent inserts on a PBR which is nearly full, CPU and elapsed time for inserts increases by many orders of magnitude, to the point where it can completely monopolize the CPU on an LPAR. In past discussions, I was...
10 months ago in Db2 for z/OS 0 Future consideration

Write Failed Lock Escalation Attempts to Master

Currently, when Lock Escalation succeeds, a message is written to the Master Log with details. However, when a Lock Escalation attempt fails (due to a timeout or deadlock), nothing is written. This sort of timeout or deadlock can be difficult to d...
10 months ago in Db2 for z/OS 0 Future consideration

Correct wrong data in IFCID0172 QW0172HQ/QW0172Q1 when package changes occur during waiting/deadlocking

The issue is that 1.- Thread 1 and Thread 2 get locks 2.- Thread 1 changes packages 3.- Thread 1 and 2 deadlock 4.- Thread 1 is chosen as blocker and deadlock processing uses user data from Thread 1's waiter, but the package dependent information ...
almost 2 years ago in Db2 for z/OS 0 Future consideration

Delete DB2 Old Archive logs without stopping DB2

We have a lot of old logs in our DB2 BSDS that no longer exist. I dont find a documentation that explain how to remove them without stopping DB2 and in the DB2 doc : https://www.ibm.com/docs/en/db2-for-zos/12?topic=utilities-dsnju003-change-log-in...
7 months ago in Db2 for z/OS 0 Future consideration

Update DB2 (DDF) to use a stronger Hash Algorithm in the DDF global authentication cache feature

Presently, DB2 DDF is using MD5 Hashing in the DDF global authentication cache feature. This hashing cipher is long considered weak and guidance is that it should no longer be used. We ask IBM to consider a change to DB2 to up level this feature t...
about 1 year ago in Db2 for z/OS 0 Future consideration

Enhance command -DISPLAY PROFILE with keyword DETAIL

The -DISPLAY PROFILE command allows to determine if profiling is active or inactive on a specific DB2 member. The command returns output similar to: -display profile DSNT753I +DB2A DSNT1DSP DISPLAY PROFILE REPORT FOLLOWS: STATUS = ON TIMESTAMP = ...
about 2 years ago in Db2 for z/OS 1 Future consideration

remove limitations in workfile database which leedsto outages

When a workfile is created Db2 increments obid, when a workfile ist dropped the obid is not released by Db2. There is a restriction of maximum 500 workfiles. When the limit has been reached, no more work files can be created, SQL code -497 is retu...
about 2 years ago in Db2 for z/OS 0 Future consideration