Wednesday, October 15, 2014

Strengths and weaknesses of trigger mechanisms

Strengths and Weaknesses of Triggers / Advantages and Disadvantages of using Triggers / Merits and Demerits of Trigger mechanisms


Strengths and Weaknesses of Triggers / Trigger mechanisms


  • Used for enforcing referential integrity.
  • Easy to implement business rules through triggers.
  • Event logging is easier.
  • It can control transactions hence lead to safer transactions.
  • Consistency is maintained.
  • Efficiency in performing transactions.
  • Cascading referential integrity.
  • Implicitly called for actions during database changes. Very much helpful in a case where many changes need to be done on different tables for a single action.


  • Triggers should be written with extra care. Trigger error may lead to failure of insert, delete, or update operations at runtime.
  • Excessive use of triggers can result in complex interdependencies. For example, cascading triggers can induce chain of actions.
  • Increased complexity.
  • May decrease the performance of the database.
  • Every time a trigger is fired, its code must be recompiled.
  • Database triggers can be accidentally disabled or dropped by a person with sufficient privilege.
  • The hidden nature of triggers is another important weakness.

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