Restructure and multiple physical databases

Products

• IDMS

Issue/Introduction

There is one global schema that maps to several physical databases. The same programs are used to access all databases. A new record is being created as member of existing record.

At first only one database is to be restructured in order to test the programs.

Can the same programs without recompilation access all databases (restructured and NOT restructured)?

Can the same programs access both databases without any problems?

Environment

Release: All supported releases.

Resolution

A new record is being added and the existing OWNER of the new set is being restructured to add the pointers for the new set. The subschema will have a new PREFIX length for the existing owner.

If that subschema load module is used to access a database that has not been restructured to match, then any attempt to obtain the owner record will get 0353 error-status because the prefix length will not match. 

If that subschema is used to STORE any of those owner records into the unrestructured database, that will be a very big problem because there will be owner records in that database of both lengths and that will be difficult to fix. 

Make sure that the new subschema load module is not made available for databases that have not been restructured to match.

Additional Information

Modifying Schema Entities