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As mentioned in Case TS004024647 there are some situations where inserts in lob structures do not provide the expected performance. Instead they cause massive CPU consumption in the Coupling Facility for the spacemap search. The problem is excessi...
Since V10 there is implicit casting, which is one hand a good feature, but on the other hand can lead to big performance problems. Improve the implicit casting so that the resulting datatype is indexable, e.g. make SELECT ... FROM T1 WHERE Integer...
Most of our tables that are created before DB2 V8 (and even some created later than that) uses the primary key as the partitioning key. The resulting partitioning key therefore consists of many columns, but the significant columns for partitioning...
DB2 Return Code Differentiate for Deadlock and Timeout via Subsys Normal Call Exit
DB2 presents IMS ( via Subsystem Normal Call Exit ) with the same return code (4) for:
DB2 resource deadlocks
DB2 resource unavailable conditions
Example, lock timeouts on object locks, such as are taken by DB2 utilities and those caused b...
Hello Db2 for Z/OS Development. Apar PM89016 was created several years ago to implement the lock avoidance for singleton SELECTs with ISO(CS) and CD(YES) when R-scan is used, or the index that is chosen has matching predicates on all columns of th...
Create INDEX and SKPT lock. DDL and continuous availability.
Working in a banking 24x7 environment without any maintenance window our concurrency issues with DDL changes are increasing more and more everyday as our workload increases. There are some concurrency problems that we think it should value the eff...
Add Two Factor Authentication support for Data Studio
Our z/OS security infrastructure now requires two factor authentication for all z/OS IDs which have elevated privileges. These IDs are required to configure new connections or apply maintenance for bind activities in DS. Are there any plans to add...
almost 3 years ago
in Db2 for z/OS
Planned for future release
When using REOPT(ALWAYS) on a batch package to deliberately avoid filling the Dynamic Statement Cache (DSC) the SQL is, correctly, not inserted into the DSC and is not exrternalized by an IFCID 316. However this then "hides" the workload from moni...
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