If a user-defined procedure has the same name as a system procedure, the user-defined procedure might not ever execute.

In programming, particularly within SQL and similar languages, if a user-defined procedure shares its name with a system procedure, the user-defined version may not execute as intended. This occurs because when a call is made to that procedure, the database system typically resolves names in a specific scope, preferring the system procedure over the user-defined one. This can lead to confusion and issues with database operations as the behaviors and functionalities of the system procedure could be vastly different from the user-defined procedure.

It’s essential to maintain unique naming conventions to avoid such conflicts. One common practice is to use a prefix or suffix in user-defined procedure names to clearly distinguish them from system procedures (e.g., prefixing user-defined procedures with "usr_" or suffixed with "_ud"). This helps in ensuring that when you reference a procedure, the system knows exactly which one to execute, thus maintaining the intended functionality and reducing potential errors in your code environment.