- Distributed database design: how DB and applications should be placed across the sites.
- Distributed query processing: how to make a cost-effective query.
- Distributed directory management: may be global or local to each site, centralised or distributed over multiple sites, single or multiple copies.
- Distributed concurrency control: two approaches include locking and time-stamping.
- Distributed deadlock management: same as normal DB.
- Reliability of distributed DBMS: if no mechanisms are in place.
- Operating system support: can become a bottleneck to whole system. In distributed environment additional problem of having to deal with multiple layers of network of software.
- Heterogeneous databases,
- Relationship among problems mentioned above.
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