The sections in this article are

• 1 Taxonomy of Distributed Database Systems
• 2 Distributed Database Architecture
• 3 Data Allocation
• 4 Distributed Query Processing
• 5 Distributed Transaction Processing
• 6 Distributed Concurrency Control
• 7 Distributed Commit Protocols
• 8 Replication of Data
• 9 Alternative Models of Distributed Transaction Processing
• 10 Conclusions