TelegraphCQ: An Architectural Status Report.

We are building TelegraphCQ, a system to process continuous queries over data streams. Although we had implemented some parts of this technology in earlier Java-based prototypes, our experiences were not positive. As a result, we decided to use PostgreSQL, an open source RDBMS as a starting point for our new implementation. In March 2003, we completed an alpha milestone of TelegraphCQ. In this paper, we report on the development status of our project, with a focus on architectural issues. Specifically, we describe our experiences extending a traditional DBMS towards managing data streams, and an overview of the current early-access release of the system.