Elke SAP Labs Berlin wrote: 
>Will the second instance (where you want to apply the differences to) have
data and need to have it afterwards, too?  
Yes
>Or would it be possible to do a schemaextract on the first instance and
create the complete schema in the second one? 
This would not be my choice.
>Or do you expect that any difference can be applied without bad impacts on
the data in >that schema on the second instance?  
This is my expectation unless tables/fields are dropped or field size
reduced to less than the width of the data or unless the data type of fields
are changed.  In these cases, we would need to dump the data before the
change and load it afterward.

Typically schema changes involve adding new tables/fields/indexes and
dropping unused tables/fields/indexes. 
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