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3. Never hard-code an Oracle error number.
5. Capture call stack, error code, error stack, error backtrace.
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How to Handle Exceptions Properly - Part 3
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9. Send app-specific error message with RAISE_APPLICATION_ERROR.
8. Use LOG ERRORS to suppress SQL errors at the row level.
7. Compile-time warnings help avoid "WHEN OTHERS THEN NULL".
6. Always log error (and backtrace) before re-raising the exception.
