Cloud Computing Storage Backup and Recovery Strategy Based on Secure IoT and Spark

Table 5

Cache strategy experiment result data.

Query strategy	Not cached by default	Default cache	Adaptive caching	Adaptive caching strategy
Query 1	81.2	79.3	68.6	Union push down + cache
Query 2	94.3	129.4	99.4	Do not set cache
Query 3	249.4	289.6	258.5	Do not set cache
Query 4	365.6	221.9	186.0	Union push down + cache