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Lock access plan for a query. Prevent the optimizer from changing a plan, once a "good" plan has been determined.
We see cases where a large query runs fine, and something changes the stats, which causes the optimizer to choose a really bad plan. We would like to be able to lock an individual query, and tell the optimizer: "Just use this plan".
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.
Optimizer should ignore RTRIM when calculation filter factor
When the optimizer calculates the filter factor for a predicate which uses RTRIM, it just returns the default value. (0.04)It should ignore the RTRIM and use the COLCARD of the column stats instead.Refer to Case: TS001114316
iidraccess-11.4-10014-linux-x86-setup.binsetup-iidr-188.8.131.52-5001-linux-x86.bindo not properly define directory or file permissions and/or reflect too extensive permissions.At JPMC files/directories will not pass security scans with permissions of...
Differentiate between Read and Write IO performance (Overhead and TransferRate) and optimise accordingly
Background: Db2 is sensitive to IO performance, and compiles access plans accordingly to optimise IO versus CPU costs. At the tablespace level, average Overhead and TransferRate are configured in units of milliseconds.Issue: customers such as ou...
Add ability to invalidate single plan without flushing entire package cache
I would like the ability to invalidate/flush access plans and performance data for a specific statement from the package cache. It seems like the EXECUTABLE_ID would allow us to uniquely identify an access plan for this purpose.Flushing the entire...
WLB does not work for Java XA applications in pureScale environment
If WLB is enabled and Java client is involved in XA transaction, jcc driver does not perform work load balancing (WLB), when the Transaction Manger uses Dual or Multi-transport model (for example: IBM MQ and IBM LotusÂ® Domino).
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