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What is a Database Trigger?

A trigger is a set of actions that are run automatically when a specified change or read operation is performed on a specified physical database table. The change operation can be an insert, update, or delete high level language statement in an application program. The read operation can be a fetch, get, or read high level language statement in an application program. As well as from high level languages, these operations could also originate with queries, ODBC, JDBC, certain CL commands for example RCVF, interactive SQL, embedded SQL or Call Level Interface SQL.

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