Actions in an MLS Active Database System

When the rule is triggered and its condition evaluates to true, the action of the rule must be executed. Possible actions in an MLS active database include,

  1. Data modification/retrieval operation – the action of the rule causes a data operation (insert, update, delete, access).
  2. Transaction operation – the action of the rule causes a transaction operation (e.g. abort).
  3. Application-defined operation – the action causes some procedure in an application to be executed.
  4. External operation – the action causes some external operations (e.g. informing the user).

Some active database languages allow a rule to specify multiple actions. Usually these actions are ordered which allows them to be executed sequentially.

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