Graph Database Indexing Using Structured Graph Decomposition
Williams, D.W.; Jun Huan; Wei Wang
Data Engineering, 2007. ICDE 2007. IEEE 23rd International Conference on
Volume , Issue , 15-20 April 2007 Page(s):976 - 985
Digital Object Identifier   10.1109/ICDE.2007.368956
Summary:We introduce a novel method of indexing graph databases in order to facilitate subgraph isomorphism and similarity queries. The index is comprised of two major data structures. The primary structure is a directed acyclic graph which contains a node for each of the unique, induced subgraphs of the database graphs. The secondary structure is a hash table which cross-indexes each subgraph for fast isomorphic lookup. In order to create a hash key independent of isomorphism, we utilize a code-based canonical representation of adjacency matrices, which we have further refined to improve computation speed. We validate the concept by demonstrating its effectiveness in answering queries for two practical datasets. Our experiments show that for subgraph isomorphism queries, our method outperforms existing methods by more than an order of magnitude.

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