An evaluation of vertical class partitioning for query processing in object-oriented databases

Chi-wai Fung, K. Karlapalem, Qing Li
2002 IEEE Transactions on Knowledge and Data Engineering  
Vertical partitioning is a design technique for reducing the number of disk accesses to execute a given set of queries by minimizing the number of irrelevant instance variables accessed. This is accomplished by grouping the frequently accessed instance variables as vertical class fragments. The complexity of object-oriented database models due to subclass hierarchy and class composition hierarchy complicates the definition and representation of vertical partitioning of the classes, which makes
more » ... he problem of vertical partitioning in OODBs very challenging. In this paper, we develop a comprehensive analytical cost model for processing of queries on vertically partitioned OODB classes. A set of analytical evaluation results is presented to show the effect of vertical partitioning, and to study the trade-off between projection ratio vs. selectivity factor vis-a-vis sequential vs. index access. Furthermore, an empirical experimental prototype supporting vertical class partitioning has been implemented on a commercial OODB tool kit to validate our analytical cost model.
doi:10.1109/tkde.2002.1033777 fatcat:yd6lpuvievdgdez2ide2dfousq