A database trigger is procedural code that is automatically executed in response to certain events on a particular table or view in a database. The trigger is mostly used for maintaining the integrity of the information on the database. For example, when a new record (representing a new worker) is added to the employees table, new records should also be created in the tables of the taxes, vacations and salaries.
Read more about Database Trigger: The Need and The Usage, Triggers in Oracle, Triggers in Microsoft SQL Server, Triggers in PostgreSQL, Triggers in Firebird, Triggers in MySQL, Triggers in IBM DB2 LUW, Triggers in SQLite, Triggers in XML Databases
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... An example of implementation of triggers in non-relational database can be Sedna, that provides support for triggers based on XQuery ... Triggers in Sedna were designed to be analogous to SQL2003 triggers, but natively base on XML query and update languages (XPath, XQuery and XML update language) ... A trigger in Sedna is set on any nodes of an XML document stored in database ...