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Alteration of Procedures and Functions

To alter the logic or variables of a procedure or function, use the CREATE OR REPLACE form of the command in the previous subsection. The only option for the ALTER command for functions and procedures is COMPILE. This option recompiles the procedure or function after a modification to their referenced objects has occurred. The format of this command is available in the SQL Reference Manual, at the documentation website,     

If a function or procedure that has been invalidated by a change to a table, view, or other referenced procedure or function is called, it is automatically recompiled. Whenever possible, explicit recompilation via the ALTER command should be used. This will pinpoint any problems before the users find them for you. The script in Source 7.7 will provide a list of invalid database objects upon execution. Use this script to pinpoint which packages, procedures, functions, or views need to be recompiled.

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