Abstract: For high complexity and low practicability of most on-line analytical processing(OLAP) system inference control approaches, the paper proposed an improved preventing multi-dimensional inference approach on the basis of previous researches. hhis approach is based on the QCS(Query Cells Set). It puts preventing detection of multi-dimensional inference threat on the cells set(not simple cell) that requested cells of the query depend on, so the complexity of detection algorithm is reduced greatly,which meets the normal query processing requirement of OLAP. Then the effectiveness proof and algorithm were provided, and an example was used to illustrate the algorithm as well. Compared with former inference control approaches, QCS approach not only protects the sensitive data in OLAP system effectively,but also has better computationally efficiency, which meets the practical requirements of OLAP system.

Key words: OLAP,Multi-dimensional inferencc,Inference control,Privacy protect