1 Introduction  
2 Cloud Database Management  
2.1 Cloud Data Storage Requirements  
2.2 The ACID Properties  
2.3 The CAP Theorem  
3 Consistency Models  
3.1 Data-Centric Consistency Models  
3.2 Client-Centric Consistency Models  
4 Replica Consistency Methods  
4.1 Fixed Consistency Methods  
4.2 Configurable Consistency Methods  
4.3 Consistency Monitoring Methods  
5 Discussion  
6 Conclusions