Advanced Database Management System - Tutorials and Notes: Types of real time databases

Saturday, 12 March 2016

Types of real time databases

Types of real time databases - What are the types of real-time databases? - Various types of real time databases with respect to transaction deadline - Hard real-time database - Soft real-time database



Types of Real-Time Databases (with respect to transaction deadline)


The type of a real-time database is determined by its transaction characteristics. Especially the deadline of a transaction determines the type. Based on the transaction deadline or when a transaction has to meet its deadline, we can categorize the real-time databases as follows;

  • Hard real-time database
  • Soft real-time database
 

Hard real-time database

A real-time database with a hard deadline on its transaction is called as hard real-time database. Hard deadline transactions have few or all of the following characteristics;

  • Timely and logically correct execution is considered to be critical.
  • Missing hard deadline cannot be accepted, because, that lead to catastrophic consequences (serious implications on lives or big financial damage).
  • Also called as safety critical deadlines

Hard Deadline
Example:
All safety critical systems are in this category – anti-missile system, patient monitoring system etc.

Soft real-time database

A real-time database with soft deadline transactions is called as soft real-time database. Soft deadline transactions have few or all of the following characteristics;

  • Desirable but not critical deadlines
  • Missing a deadline will not cause a failure or failure of system’s integrity.
  • Result quality degrades after deadline, and may affect quality of service of the system.
Soft Deadline

Example:
Banking system, reservation systems, etc.


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