1 Introduction. - 1. 1 Traditional Transactions. - 1. 2 Temporal Considerations. - 1. 3 Related Work. - 1. 4 Overview. - 2 A Model. - 2. 1 Centralized Environments. - 2. 2 Distributed Executions. - 3 Centralized Scheduling. - 3. 1 Performance Metrics. - 3. 2 Traditional Scheduling. - 3. 3 Optimization in Scheduling. - 3. 4 Countering Intractability. - 3. 5 Uncertainty in Scheduling. - 4 Distributed Scheduling. - 4. 1 Integrating Local Executions. - 4. 2 A Synchronization Protocol. - 4. 3 Restrictions on Executions. - 4. 4 Other Integration Issues. - 4. 5 Global Atomic Commitment. - 5 Semantics in Scheduling. - 5. 1 Adaptive Commitment. - 5. 2 Data-value Partitioning. - 6 Conclusions. - 6. 1 Issues in I/O. - 6. 2 Scheduling Online. - 6. 3 Wider Applicability. - 6. 4 In Summary. - References. Language: English