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We are frequently moving data between MS-SQL server and Db2. When data are moved from Db2 to MS-SQL there are no issues. But when data are moved from MS-SQL to DB2 we have frequent problems with varchar and nvarchar data types for data types where...
Population of V12 new added Catalog columns during activation of Function level V12R1M50 and avoid it later during executions of ALTER TABLESPACE because of contention of packages.
After you apply the PTF for APAR PI86123, the first ALTER TABLESPACE, populates any null attributes for objects created in function level V12R1M100 or earlier. When the one-time population occurs for an ALTER TABLESPACE statement, Db2 must quiesce...
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...
If a view is created by using a 'SELECT *' statement, the view is not updated when a new column is added to the base table. An example: create table dm_tab(N integer, M integer) organize by row; insert into dm_tab(N, M) values (1, 2); create view ...
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...
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 ...
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...
Currently, I know that there is no function to change only the 'Primary Key Name' of Db2. Especially in the case of Primary Key, Unique Index is also created when it is generated! Since the primary key name cannot be duplicated, there is a problem...
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