Ng Moon Pun

We develop a site-independent fragment dependency graph representation to model the dependencies among the fragments accessed by a query, and use it to formulate and solve data allocation problems for distributed database systems based on query-site and move-small query execution strategies. Expand

A major cost in retrieving multimedia data from multiple sites is the cost incurred in transferring multimedia data objects (MDOs) from different sites to the site where the query is initiated. Expand