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Full support for aggregate function with DISTINCT in OLAP SPECIFICATION
Use of DISTINCT with e.g. COUNT function in OLAP specification (PARTITION BY clause) returns error SQL0441N (SQLCODE -441).Due to the fact that Db2 does NOT support the use of DISTINCT option in such cases, we have a major impact with COGNOS gener...
Enabling readonly mode for database or user. (DB2 LUW)
Would like to see a db level and a user level parameter to enable readonly mode at database level or user level. Currently need to run set of statements to achieve this, which makes management difficult. A single statement to enable readonly mode...
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 ...
Executes external commandline-scripts from stored procedure.The stored procedure call should work like following:select * from (VALUES '`sh /tmp/test.sh`') AS TEMP(Testoutput);With the script i check if new created tables or views from developmen...
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...
Global Variables: A global variable can be created with a default value. Each session that uses it will then instantiate a version of that global variable, with the default value and any change in the value is limited in scope to its unit-of-work....
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