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Table 2 Summary of the white-box metric types supported in the SCOPE middleware for different cloud storage technologies (including both NoSQL and relational database technologies)

From: SCOPE: self-adaptive and policy-based data management middleware for federated clouds

  NoSQL Databases RDBMS
Metric type Cassandra MongoDB Redis PostgreSQL
Read latency \(\boxtimes \) \(\boxtimes \) \(\boxtimes \)  
Write latency \(\boxtimes \) \(\boxtimes \) \(\boxtimes \)  
Uptime \(\boxtimes \) \(\boxtimes \) \(\boxtimes \) \(\boxtimes \)
Average object size \(\boxtimes \) \(\boxtimes \) \(\boxtimes \) \(\boxtimes \)
Total object size \(\boxtimes \) \(\boxtimes \) \(\boxtimes \) \(\boxtimes \)
Connected clients   \(\boxtimes \) \(\boxtimes \) \(\boxtimes \)
Total connections   \(\boxtimes \) \(\boxtimes \) \(\boxtimes \)
Keycache capacity \(\boxtimes \)    
Keycache hitrate \(\boxtimes \)    
Keycache size \(\boxtimes \)    
Memory allocated \(\boxtimes \) \(\boxtimes \) \(\boxtimes \)  
Memory used \(\boxtimes \) \(\boxtimes \) \(\boxtimes \)  
Rowcache capacity \(\boxtimes \)    
Rowcache hitrate \(\boxtimes \)    
Rowcache size \(\boxtimes \)    
Read request count \(\boxtimes \) \(\boxtimes \) \(\boxtimes \)  
Write request count \(\boxtimes \) \(\boxtimes \) \(\boxtimes \)  
Total object count \(\boxtimes \) \(\boxtimes \) \(\boxtimes \) \(\boxtimes \)