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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
Ubuntu 16.04 LTS has End of life as April 2021. We use IBM DB2 11.1.4 Enterprise Edition on Ubuntu 16.04 LTS for our MDM instances which is not compatible with the higher versions of Ubuntu -18.04 LTS and above. Same is true for the updated versio...
When issuing a sentence like:
db2 drop audit policy SELECT_ALL_TABLES
The returned error message does not include the schema of the problematic object:
SQL0478N The statement failed because one or more dependencies exist on thetarget object....
IBM Data Studion needs extport/Extract from a select statement
Many people use IBM Data Studio to manage DB2 database. You can currently right click on a table and extract/export a tables contents. You cananot do the same using a select statement to say filter records or join tables for the export. Today peop...
Latch information and more internals information for performance analysis
Detailed information about LATCH to DBA. More information of wait events would be good too like if a statement is waiting for a sequential read, how much the transaction is spending on network time , block concurrency, and so on.
Reproduce Scenario and found to be a expected behavior while CTAS locks syscat.tables session 1 > create table Table1 as (select * from Table_2 ) with data; session 2, query tool > select * from syscat.tables; --> lock waiting
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