IBM Data and AI Ideas Portal for Customers


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Db2 for z/OS

Showing 977

RUNSTATS with exception consideration

All DB2 customers use RUNSTATS. The RUNSTATS results are used by the DB2 optimizer to determine optimal access plans. In 99.999 percent of all cases this is not a problem. However, there are some objects (tablespaces / indices) for which a RUNSTAT...
over 3 years ago in Db2 for z/OS 2 Not under consideration

Command confirmation in joblog of DB2MSTR.

DB2 has many commands which display or alter the status of something. There are a lot of distinct environments from which the commands can be executed (z/OS console, DSN session, TSO DSN command processor, IMS or CICS terminal, special STPs, IFI-i...
about 12 years ago in Db2 for z/OS 1 Not under consideration

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
6 months ago in Db2 for z/OS 0 Future consideration

IFCID 316 401 ZiiP Usage Statistics

Currently the IFCIDs 316 and 401 contains great data for monitoring and tuning SQLs. It would be excellent if these IFCIDs could be extended to include a separate set of ZiiP counters. IFCID 25 does this for Utilities at the moment.
almost 7 years ago in Db2 for z/OS 1 Planned for future release

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 = ...
almost 2 years ago in Db2 for z/OS 1 Future consideration

A View with Select * should be regenertated without Drop/Create View

We have a lot of views defined with Select *. Since DB2 V8 we have the option to add columns to the base table, but the view does not include the new column, which is ok and accepted. But to get the new column we have to drop and recreate the View...
over 12 years ago in Db2 for z/OS 1 Not under consideration

One-Fecht Index Scan for SELECT min(), max()

At the moment only a single SELECT min(a) or a SELECT max(a) uses a suitable index I(a, ...). When selecting both, min() and max(), a tablespace scan is used to determine the minimum and maximum value. With large tables this behaviour is very expe...
7 months ago in Db2 for z/OS 1 Not under consideration

Db2 z/OS limitations with ALTER TABLESPACE MOVE TABLE

I love the upcoming FL508 and this new availability even though I have not used it. Looking deeper into the Knowledge Center there seems to be some limitations that I would like to see resolved. The two items are: a) Exist in the same data...
over 3 years ago in Db2 for z/OS 3 Not under consideration

Avoid Reorg Abends by improving estimation of average row length

Today, for estimating the average row length being passed to sort, REORG gets that from catalog statistics with either AVGROWLEN or COMPRESSRATIO. The reason RTS stats is not used, is because RTS only contains the compressed data size.
over 5 years ago in Db2 for z/OS 0 Not under 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 very...
over 5 years ago in Db2 for z/OS 0 Not under consideration

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