Lessons from the TSIMMIS Project

8/26/99

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Table of Contents

Lessons from the TSIMMIS Project

Information Resides on Heterogeneous Information Sources

Goal: System Providing Integrated View of Heterogeneous Data

The Lazy Integration Approach

Graph Representation of OEM Data

OEM Structures Represent Arbitrary Labeled Graphs

Mediator Specification Interpreter Architecture

Query Rewriting When Known Origins of Information

Query Rewriter Pushes Conditions to Sources

Passing Bindings & Local Join Plans

Query Translation in Wrappers

Rapid Query Translation Using Templates and Actions

Capabilities-Based Rewriter in Mediator Architecture

What TSIMMIS Achieved

Insufficiencies of the TSIMMIS framework

Web emerges as a Distributed DB and XML as its Data Model

Definition of Integrated Views

Non-Materialized Views in the MIX mediator system

Author: Yannis Papakonstantinou