Performance Improving of Semi-join Based Join Operation through Algebraic Signatures

Evaluation of distributed join queries often deals with an increasing data volume and low bandwidth in large scale environments. Several techniques were proposed to improve join performances. In this paper, we propose to use a new form of signatures, the algebraic signatures. We prove that these signatures combined to semi-join based join technique are very useful for reducing the communication cost in a distributed environment and focus in the semi-join based join operation. Semi-join based join is one of the most used techniques to decrease the communication cost on distributed architectures. We demonstrate that algebraic signatures are very useful to reduce significantly the amount of the data transfer between sites. Also, we have not any data decoding step in the site receiving these data. The performance study of our technique shows the reduction of the communication costs in the semi-join based join operation. Our technique can be deployed in large scale peer to peer or grid environments especially in a network with low bandwidth and strong latency.