Benchmarking an XML Mediator

BENCHMARKING AN XML MEDIATOR

Florin DRAGAN, Georges GARDARIN
PRiSM Laboratory University of Versailles
78035 Versailles Cedex, France
email: Florin.Dragan@prism.uvsq.fr, georges.gardarin@prism.uvsq.fr
Abstract: In the recent years, XML has become the universal interchange format. Many investigations have
been made on storing, querying and integrating XML with existing applications. Many XML-
based commercial DBMSs have appeared lately. This paper reports on the analysis of an XML
mediator federating several existing XML DBMSs. We measure their storage and querying
capabilities directly through their Java API and indirectly through the XLive mediation tool. For
this purpose we have created a simple benchmark consisting in a set of queries and a variable test
database. The main scope is to reveal the weaknesses and the strengths of the implemented
indexing and federating techniques. We analyze two commercial native XML DBMS and an open-
source relational to XML mapping middleware. We first pass directly the queries to the DBMSs
and second we go through the XLive XML mediator. Results suggest that text XML is not the best
format to exchange data between a mediator and a wrapper, and also shows some possible
improvements of XQuery support in mediation architectures.

executing a query, but a few other ones (like
1. INTRODUCTION the size on disk to store a certain document)
are also proposed.
As XML capabilities have become more and The purpose of ...