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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...
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, 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 ...
need to provide a RENAME SCHEMA statement (other database products provide this)
Need RENAME SCHEMA other databases other than DB2 LUW (i.e. MaxDB from SAP) provide a statement RENAME SCHEMA to rename a schema like a RENAME TABLESPACE/TABLE/INDEX. Needed on all supported operating systems.
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...
Improve access plan resolution for SELECT MAX() (or MIN()) statements on range-partitioned tables with local (partitioned)
Context: range partitioned table with partitioned indexes A SELECT MAX() statement is issued on a field that is not the part of the partitioned key. The query is resolved by performing a full index scan on a partitioned index on that field. That i...
SQLCODE SQL0302N should give hint which parameter is too long.
Scenario: prepared statementsError: host variable too longProblem: SQL0302N should give a hint which parameter is affected. Details:Using prepared statements with parameter markers such as INSERT INTO TESTTAB (COL1, COL2) VALUES (?, ?)"); DB2 thro...
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...
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