On the cache mechanism for ISMBDI mode based on ontology

In order to lighten the burden of worknet and shorten the respond time of ISMBDI mode, a cache mechanism for ISMBDI mode is built, and correspondingly a new cache replacement policy LRAFU is presented. This policy well integrates the traditional cache replacement policies LRU (Least Recently Used) and LFU (Least Frequently Used), not only avoids the problem of cache pollution, fits the character of ISMBDI, but also guarantees high hit rate and use rate of cache. Based on the cache mechanism built in ISMBDI, an improved optimized algorithm of query plan for ISMBDI mode is proposed. This algorithm shortens the query time greatly and improves the query efficiency. The experimental results show that improved algorithm has more functions and quicker speed, and higher percentage of hits and utilization ratio.