Trigger

Trigger is a set of SQL statements that automatically "fires off" an action when a specific operation, such as changing data in a table, occurs. A trigger consists of an INSERT, DELETE, or UPDATE statement issued against an associated table and the related procedure. Triggers are used to preserve data integrity by checking on or changing data in a consistent manner.

Trigger

Triggers can be written for the following purposes:

  • Auditing
  • Enforce complex security authorizations
  • Enforce referential integrity across nodes in a distributed database
  • Event logging and storing information on table access
  • Gather statistics on table access
  • Generate some derived column values automatically
  • Imposing security authorizations
  • Maintain synchronous table replicates
  • Prevent invalid transactions
  • Provide transparent event logging
  • Synchronous replication of tables

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