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Add options for "recommend indexes" and "evaluate indexes" explain types to explain_from_section
When running explains from jupyter notebook, I prefer to use EXPLAIN_FROM_SECTION. However for in-depth analysis of indexes, I need the RECOMMEND INDEXES and EVALUATE INDEXES explain modes. These don't seem to exist for EXPLAIN_FROM_SECTION. This ...
Tool db2batch should be able to display Number of rows affected
Often db2batch is used for tuning / benchmarking purposes and very often the number of affected rows is interesting.
Command line tool. 'db2'. provides the option to display the Number of rows affected, db2 -tvmf <SQL-DML-File>
$ db2 -t...
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-220.127.116.11-5001-linux-x86.bin do not properly define directory or file permissions and/or reflect too extensive permissions. At JPMC files/directories will not pass security scans with permissions ...
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 our...
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