Reading Questions. Lecture 15 (02/21). Federated databases. Autonomy and Heterogeneity.

As you read the paper, consider the following questions:

Question 1: What optimization goal do the authors choose for queries over web services?

Question 2: How does the proposed query optimization technique compare with a traditional cost-based optimizer?

Question 3: Other than query optimization, what are the challenges that arise when running queries over web services?