IBM Data and AI Ideas Portal for Customers


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Db2 for z/OS

Showing 984

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...
over 8 years ago in Db2 for z/OS 2 Not under consideration

Create a new partition if a LOB-tablespace gets a new partition in a UTS PBG

Hi Sometime the base-table is very small whereas the corresponding lob-tablespace can get bigger and bigger. So the base tablespace remains at one partition whereas the log tablespace can run against the limit of 255 datasets
over 6 years ago in Db2 for z/OS 1 Not under consideration

Partial PBG REORG for added Partitions due to previous PART LEVEL REORGs

When I run a PART LEVEL REORG of a PBG tablespace and the current data doesn't fit into its original partition DB2 adds a new partition at the end and uses it for the "overflow" data. Which is fine, btw.... If i do this for multiple partitions, se...
over 5 years ago in Db2 for z/OS 1 Functionality already exists

Masking function with GRANT per column

Column masking has been great help in managing sensitive data and complying with the General Data Protection Regulation (GDPR).But today’s solution to know if a user has access to data without masking is to create a Mask using a CASE with SESSION_...
about 1 year ago in Db2 for z/OS 2 Future 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...
almost 7 years ago in Db2 for z/OS 0 Not under consideration

AREO Status via select

Some ddl Changes are in table SYSPENDINGDDL Some ddl Changes are not there: for example alter table add column can only be see via -dis db() sp() adv It would be better to have the same bahavior for all ddl changes with AREO* Status.Maybe it could...
about 3 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. The...
over 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...
almost 7 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...
over 6 years ago in Db2 for z/OS 0 Not under consideration

Implement a TRY_CAST specification or equivalent

Implement a TRY_CAST specification which is identical in syntax and semantics to a CAST specification, with the exception that it would return NULL and raise only an SQL warning, not an error, if the target data type is numeric, and the source typ...
over 8 years ago in Db2 for z/OS 0 Not under consideration

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