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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...
With the memory statistics similar to the ‘db2pd -dbptnmem’ output within the STMM logs, it would be possible to get memory usage report over time from Db2 perspective without any permanent monitoring tool (as long as STMM is used/active). It woul...
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.
Official documentation of FMP enhancement variables DB2_AGENT_CACHING_FMP and DB2_MAX_THREADS_PER_FMP
Valuable enhancements for db2fmp processing have been added back in Db2 V8 and V9 already via APAR (e.g. IZ08425), but they are still NOT documented for Db2 V10 and V11, although they are valid and available. Concerning Java stored procedure handl...
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...
Please see the attached word document and as our development teams are trying to retrieve the NEXTCACHEREFESHVALUE value after ALTER SEQUENCE ..RESTART and before invoking NEXT VALUE but could not able to find the way to get the value of NEXT CACH...
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
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