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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...
Add ability to detect changes in data (similar to QSYS2.DISPLAY_JOURNAL)
When supporting a production environment, one needs to detect the sequence of updates, including before and after image. On IBMi, we use extensively the functionality to consult the journal entries (https://www.ibm.com/support/pages/qsys2displayjo...
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...
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....
Functions for converting Unix Epoch Time and Dealing with RHEL 8 Native Posix MQ
SQL scalar functions for Converting between human-readable date/time and Unix Epoch Time. For example: db2 "values ept2date(123456789,0)" is equivalent to Linux GNU date command date -d "1970-01-01 1234567890 sec UTC db2 "values "date2ept('now')" ...
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 developm...
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