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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...
For the ALTER TABLE statement, it's relevant to add an "AFTER ..." OR "BEFORE ..." clause specifying where in the table the new column is to be placed. This statement component exists in DB2 for i and in certain other databases (like Informix and ...
Currently, ALTER TABLESPACE ... REBALANCE can be augmented with two optional clauses:ALTER TABLESPACE ... REBALANCE SUSPENDALTER TABLESPACE ... REBALANCE RESUME We need ALTER TABLESPACE ... REBALANCE CANCELorALTER TABLESPACE ... REBALANCE STOP I w...
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