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SAP code is database- and OS-independent. It is perfectly possible to do this, and is supported to run your development and quality assurance system on SQL Server/Windows and your production system on Oracle/AIX. This is inevitable during an OS/DB migration in which the development and quality assurance has already been migrated, and production not.
As such, upgrading DB2 on the development and quality assurance system, while leaving DB2 on the production system in the old version, should be no problem.
One exception: You should be careful if you use EXEC SQL in your own ABAP code. EXEC SQL can be used to call SQL code directly. SQL code is always database-dependent, although, different database versions might respond slightly differently.
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