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DB2 optimizer in v10.5/v11.1 has still several weaknesses in generating correct plan when using RP tables, because it bases its plan only on global stats when partition (data and indexes) stats are available. Case TS001150102
Currently on Db2 LUW CREATE OR REPLACE is only allowed for the owner of a database object. CREATE OR REPLACE authorization should be opened up to allow create/replace by anyone who has the ability to drop the object and to create the object with a...
As part of the SQL 92 standard, there is a referential action for foreign key that allows to update on cascade. The following link is the SQL 92 standard:http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt In the Section 11.8, there is the f...
Currently, in column-organized tables you cannot alter or rename columns and you even cannot drop columns. The only allowed operation is to add a column. This renders the column-based-tables pretty useless because in a normal environment, it must ...
It's not supported to use ASCII and UNICODE tables together (SQL0873N)
Case #000080573 DB2 Z/OS supports multi-codeset objects in one database but LUW does not that. We cannot do JOIN, UNION ALL, or SELECT ~ INSERT between these tables which are all supported in DB2 Z/OS. In addition, DB2 Z/OS has a function like UNI...
It is common in the database world (DB2 but all the others I have worked with are the same) to have a separate product installed that generates code and submits it to the database for processing. Eventually, you will encounter SQL that doesn't per...
Consideration of Statistical Views for INSERT with Sub-SELECT
We try to improve the performance on an INSERT with an underlying complex subselect eg. "INSERT INTO table "Therefore we created a statistical view through which the optimizer should be able to get more distribution statistics and build a better a...
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