List five issues that arise in the design of heterogeneous distributed transaction processing systems that do not arise in homogeneous distributed systems.
What will be an ideal response?
1. The DBMSs are supplied by different vendors and speak different dialects of SQL.
2. Some of the DBMSs do not perform the two-phase commit protocol.
3. The systems use different low-level communication protocols.
4. At a higher level, some systems use RPCs and others use peer-to-peer communication.
5. Some of the legacy systems are so old that the source code for the transactions has disappeared from the face of the earth.
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