IBM Data and AI Ideas Portal for Customers


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Db2 for z/OS

Showing 787

Use Limitkeys as histogram-stats, if appropriate

Recently we had a Performance Problem where I was requested to collect histogram-stats for a column, which matches the partitioning column. Because this was a big table, running this runstats took about 9 hours to complete. If limitkeys could serv...
about 8 years ago in Db2 for z/OS 2 Not under consideration

DB2 z/OS security; hide install SYSADM and SYSOPR from DSNZPARM; use RACF instead

In DB2 z/OS, no group and/or userids are more powerful than the Install SYSADM and to no small degree the Install SYSOPR. Yet, these userids and/or groups are easily found by anyone having access to a db2 subsystem and knowing the existance of DSN...
almost 3 years ago in Db2 for z/OS 1 Not under consideration

DB2 - ALTER TABLE ROTATE

Auslöser :PMR 28789The deadlock occurs between the ALTER TABLE ROTATE FIRST TO LAST, which invalidates pkg dependent on the table and triggers an auto rebind ( Thealter table process obtained a row lock on SYSTSTAB and waiting for row lock on SYS...
over 6 years ago in Db2 for z/OS 0 Not under consideration

IFCID 172/196 (Deadlock/Timeout) – Add STCK for Held Locks

At IFCID 172/196 (Deadlock/Timestamp) please add a STCK for the held lock (blocker) when the lock was granted. In case of a lockout with this STCK the sequence of the locks, and so the sequence of the blocker-SQLs, can be reconstructed ‘post mor...
almost 11 years ago in Db2 for z/OS 1 Not under consideration

Improved granularity for WITH clause

GGDB210017 Implement WITH clause syntax as a sub-clause for JOIN specification
over 11 years ago in Db2 for z/OS 1 Not under consideration

I/O required for RI check against the parent table when inserts done on the child table.

We have noticed that there is a high number of get pages on the parents indexes when doing an INSERT of a child row. Here are the details of our situation: The parent table has a partitioned primary key index with 132 partitions....
about 5 years ago in Db2 for z/OS 0 Not under consideration

Add an option to DB2 for z/OS utility REPAIR

The Repair-Utility has almost all features to fit a pageset, copied from one DB2 sub system („Source“) into another („Target“):· REPAIR LEVELID to prohibit downlevel detection· REPAIR CATALOG to alter the DB2 catalog to accept some pages...
over 6 years ago in Db2 for z/OS 1 Not under consideration

Replacing data in Archive Enabled Tables using LOAD

In most tables data can be replaced using LOAD RESUME NO REPLACE. In Archive Enabled Tables it cannot. We want to use LOAD REPLACE to replace the existing data instead of having to delete the current data and then load with RESUME YES. The old dat...
almost 6 years ago in Db2 for z/OS 0 Not under consideration

Add SYSDISC DSNTIAUL format to REORG utility

Sometimes there's a need to repopulate DB2 tables concatenating outputs from REORG SYSDISC and DSNTIAUL in a single LOAD SYSREC file. So the idea is to have a parameter like REORG ... SYSDISC FORMAT INTERNAL|DSNTIAUL. Basically the difference betw...
over 5 years ago in Db2 for z/OS 0 Not under consideration

Provide a threshold for the number of incidents caused by a single holder for message DSNT376I.

Availability and stable systems are very important to us (as they are for most users of DB2 for Z). Recently, I implemented a process that automatically terminated any process that shows up as the holder for a specific number (threshold) of DSNT37...
about 6 years ago in Db2 for z/OS 1 Not under consideration

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