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Enhance correlated subquery cardinality estimate with stat views
Peoplesoft application extensively uses correlated subqueries on EFFDT to check that EFFDT = (SELECT MAX(EFFDT) FROM ...). Cardinality estimations can be derived from PK, but this sometimes is not sufficient. We need to be able to get EFFDT estima...
Please create current training material for Db2 administration
Please create basic training material for database administrators on Db2 that is easily consumable and free. A platform like EDx, Udemy, etc, would be ideal, but even on a proprietary platform would be acceptable.
Automatic Lock-Escalation from Row- to Extent-Level
Db2 is mainly using row-level locking and tries to avoid lock-escalation to table-level. This behavior is helpful in most of Db2s use cases, but there are some particular situations when locking on a higher level than row would be beneficial. Cons...
adjust card estimates on predicates using both COL = '?' and COL > <value> similar to accounting for NUMNULLS
Component: DB2 optimizer When a column is NULLable, a predicate COL = ? will account for numnulls to estimate cardinality. The problem comes when column is NOT NULL, and "the NULL value" is a real value. Peoplesoft has been designed to use a major...
IBM published a technote "DB2 Bind File and Package Name List" https://www-01.ibm.com/support/docview.wss?uid=swg21987465 listing all the names of the bind files of the different versions of Db2. It needs to be extended for Db2 11.5
Allow Db2 ESAF interface with IMS to use PSB in place of loadmodule
Currently when a thread is created between IMS->Db2 the Db2 ESAF exit uses the Load module name to link to a plan name of the same name (or another name if using RTT load module). In a test environment there may be a scenario where several diff...
Ability to stop using of AOT and other db2 tables on the IDAA
When we STOP or start for UT ,spaces of tables that are loaded to IDAA or spaces that relate to AOT's, these spaces are still available for the IDAA. We can SELECT data from the IDAA for these tables and for AOT's' we can also update them. We need...
Oracle (sorry to compare!) has ability to generate a UID. We are looking for this function in DB2 Zos and LUW. Universal Unique Identifier (UUID) -- In Oracle Oracle sequences are frequently used to provide unique numbers for primary keys where an...
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