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One of the most confusing runtime errors in Camunda Platform is: ENGINE -03004 Exception while executing Database Operation It usually appears suddenly in production — even when the process worked perfectly in testing. This guide explains why it happens and how to fix it quickly . 📌 What the Error Means This error does NOT mean the database is down. It means the workflow engine tried to persist or update data but failed due to data integrity or transaction conflict . 🖼️ Example Incident in Operate 4 🧠 Most Common Causes 1️⃣ Optimistic Locking Conflict (Most Common) Multiple workers updating the same process instance simultaneously. Example: Two service tasks complete at the same time → both update variables → DB conflict. Fix Add asynchronous continuation. camunda: asyncBefore= "true" camunda: exclusive= "true" This serializes execution. 2️⃣ Parallel Gateway Updating Same Variable Bad pattern: Parallel tasks ↘ update status ↗ update status Two bran...