- The required data are at one local site and the distributed DBMS routes requests as necessary.
- The required data are located in at least one nonlocal site and the distributed DBMS routes requests as necessary.
- The required data are at one local site and the distributed DBMS passes the request to only the local DBMS.
- The required data are located in at least one nonlocal site and the distributed DBMS passes the request to only the local DBMS.
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