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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...
[This requirement originates from JPMC EDW/RTC group] The db2diag.log is an extremely useful reference for both customers and db2support persons. We are able to identify milestones events, find errors, and gather clues to their issues, all before ...
Windows OS 'Installation Instructions' need to be updated to account for the current complexity of security/privileges environments. Specifically, where an end-user account is not a member of the 'most-privileged' (i.e. Administrator) group accoun...
Redirect Restore + RF with a user defined MIRRORLOGPATH in the backup image succeeds(RIMS)
Headline cont... nevertheless target MIRRORLOGPATH does not exist. Description-Redirect Restore + RF with a user defined MIRRORLOGPATH in the backup image succeeds nevertheless target MIRRORLOGPATH does not exist. DB2 does not throw an error at Re...
BACKUP/RESTORE should support parallelcompression of backupstripes when using native compress option(RIMS)
Headline Cont...(thisiscurrentlysingle-threadpertablespace).Description -currently, Backup will fetch from multiple tablespaces using multiple concurrent prefetcher sub-agents. However when Backup Compression is enabled, data is forced through Bac...
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...
Allow a DBA connection even if maximum connections has been exceeded.(RIMS)
Note from customer: Jill, We need a feature enhancement, where there is a way for a DBA to always be able to connect to the DB (at least one connection), even if maxappls, maxagents, maxwhatever has been hit. DBAs shouldnt have to force off applic...
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...
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