Transcript MULTIMEDIA DATABASE MANAGEMENT SYSTEM ARCHITECTURE

BIT 3193
MULTIMEDIA DATABASE
Chapter 5:
MULTIMEDIA DATABASE
MANAGEMENT SYSTEM
ARCHITECTURE
5.2 Client-Server Component
Communication Manager
 Retrieval Schedule Generation
 Response Handler
 Interactive Query Formulator

Communication Manager :
Manages the communication
requirements of a multimedia database
client.
 Its functionalities are the same as that of
the server communication manager.

Retrieval Schedule Generator:
Determines the schedule for retrieving media
objects.
 For the retrieval schedule generator:

◦ The response handler provides information regarding
the objects composing the response and the
associated temporal information.
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The retrieval schedule generator:
◦ Based on the available buffer and network throughput,
determines the schedule for object retrieval.

This retrieval schedule is used by the
communication manager to download media
objects in the specified sequence.
Response Handler:
Response Handler: Interacts with the client
communication manager in order to identify the
type of response generated by the server.
 If the response comprise of the information
regarding the object to be presented:

◦ Then the information is passed to the retrieval
schedule generator for determining the retrieval
sequence.

If the response comprise of the information
regarding modifying the posed query or a null
answer:
◦ The response is passed to the user.
Interactive Query Formulator:
Helps a user to frame an appropriate
query to be communicated to a database
server.
 This module takes the response from the
server (through the response handler
module) in order to reformulate the
query, if necessary.

5.3 Implementation Considerations
Hardware Resource
 Operating System
 Computer Network

Hardware resources:
The available hardware resources influence both
client and server design.
 On the server side:

◦ The available disk space limits the size of a multimedia
database that can be handled.
◦ The number of queries that can be handled and the
query response time depends, to a certain extent, on
the speed of the system.

On the client side:
◦ Buffer availability for media objects retrieval is
influenced by available hardware sources.
◦ User interface for multimedia presentation is also
influenced by hardware characteristics such as
monitor resolution, width and height.
Operating System:
Multimedia database are composed of
continuous media objects.
 The retrieval and presentations of these
media objects have an associated time
constraints.
 Hence, real-time features might be
needed as part of the operating system.
 Also, the file system needs to handle large
media objects.

Computer Network:
Services offered by computer networks
influences the retrieval of media objects by a
client system.
 If guaranteed throughput is not offered by the
network service provider, the client may not be
able to retrieve object as the required time.
 This may lead to an object presentations
sequence that differs from the temporal
requirements specified in the database.
 Also, the buffer requirements in the clients
system depend on the throughput offered by the
network service provider.
