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Triggers & Stored Procedures: Mistakes

Module: Schema Design & Advanced DDL

Putting complex business logic in triggers

Keep triggers simple, put business logic in application code

Triggers hide behavior. Complex logic is hard to debug and maintain. Use triggers only for simple automation. Put business logic in application where it's visible and testable.

High

graph LR

A[Complex Logic] --> B{Where?}

B -->|Trigger| C[Hidden, hard to debug]

B -->|Application| D[Visible, easy to test]

style C fill:#FFB6C6

style D fill:#90EE90

Cascading triggers that fire other triggers

Avoid trigger chains, use single trigger or application logic

Trigger A fires trigger B fires trigger C. Performance multiplies. Debugging nightmare. Solution: Use single trigger or move logic to application.

Critical

No error handling in triggers

Add error handling, log failures, provide clear error messages

Trigger fails → entire transaction rolls back. No error message. Hard to debug. Solution: Add EXCEPTION handling, log errors.

Medium