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Ability to enable/disable query optimization for foreign keys at a statement level. Example, many ETL (Extract, Transform, Load) processes utilize SQL statements to verify data integrity when foreign keys are not enforced. In order to return corre...
Session level LOCK TIMEOUT should apply to all lock types.(RIMS)
Currently, the session-level lock timeout only applies to SQLP_TABLE, SQLP_RECORD, SQLP_KEYVALUE, and SQLP_MDCBLOCK. Customer would like this to apply to all locks acquired by the application that set the session-level timeout value.[Michael Snowb...
New db2diag.log message to indicate when an optimizer plan is missed due to missing temp tablespace(RIMS)
(See Discussion entry for full details) When an optimizer plan is ineligible due to the non-existence of a sufficiently large temporary tablespace (ie. sort is unable to handle the width of workload row size), a db2diag.log message should be writt...
Optimizer should account for bufferpool hit-ratio when estimated page access time.(RIMS)
In PMR 00962,7TD,000, Goldman Sachs had a scenario where optimizer was choosing a more expensive HSJN over a less expensive NLJN. Shu Lin summaries the problem well: 'In terms of CPU cost and number of IOs, we correctly estimate that NLJN is bette...
new optimizer guideline to break CSE for a specific query or as a global guideline(RIMS)
Customer encountered scenario where use of CSE resulted in degradation in query performance (details below). This requirement is to implement a new optimizer guideline that will allow customer to break CSE for a specific query or as a global guide...
Calisto suggested if the MOD function FF issue is pervasive in the customer's environment, we could do an enhancement(under regvar maybe), so please ask for it. I will ask Satya to collect the stats across the partitions. The current stats shows a...
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