CONTINUOUS DISPLAY OF PRESENTATIONS SHARING CLIPS

Databases were introduced to remove redundancy from conventional file systems and encourage sharing, which resulted in update anomalies when information was modified. With presentations (movies) sharing clips ( sequence of frames), continuous display becomes challenging as well. C ontinuous display requires the system to retrieve the information with no disruptions or delays (hiccups) once a display is initiated. To en sure a continuous display using a multi-disk hardware platform, a vide o object is striped into subobjects. The system enforces a regular sch edule on retrieval of each subobject by controlling the placement of t he subobjects across the disks. Now if different presentations share s ubobjects, each presentation will enforce its own restrictions on the placement of the data, resulting in an irregular schedule. We investig ate approaches to render a schedule regular for two alternative displa y paradigms: Demand and Data driven.