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Some Do's

• Do experiment with small test cases using triggers so that you are comfortable with what they are and how they work before attempting to implement a complex application involving triggers.
• Do remember that when you change the type or length of a field in the data dictionary (that has associated triggers) you should recompile:
• All trigger functions associated with the field.
• All I/O modules of files that contain the field as a real or virtual field.
• All functions that make *DBOPTIMIZE references to file(s) containing the field.
• The list of objects to recompile is easily obtained by producing a full listing of the definition of the field.
• Remember that when you change the layout of a database file (that has associated triggers) you should recompile:
• The I/O module of file.
• All trigger functions associated with the file.
• Any functions that make *DBOPTIMIZE references to the file.

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Where trigger "requests" are to be supported, introduce a virtual (or real) field into the file definition and use it to "fire" the trigger in the normal way.
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