DDS (Device Database System)

DDS (Device Database System):

It uses distributed query processing over the device system.

DDS supports three types of queries. They are:

  1. Snapshot
  2. Long-running
  3. Historical

This method is preferred for queries.

In DDS each device behaves like a mini server, including functions and the ability to process parts of the queries. 

This mechanism improves the query performance in parameters like resource utilization, response time, throughput, and time delay. However, this middleware is not preferable in resource-limited WSN as it only deals with query problems.

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