Running SQL Queries on Production/live Databases - 5 Things to Remember

Did you ever face a situation where some of your innocuous looking action has cause production issue and that too big time? Well, I hope you have not because it's certainly, not a pleasant experience. One of such innocuous looking action is running SQL queries on production databases. I had that in past very early in my career where I removed some config as duplicates only to find after a week that it stopped publishing messages to one of the downstream. When you work in complex systems which has so many components, millions of lines of code, thousands of configuration and many databases with hundreds of tables, you have to be really careful with anything you do. Often there is on the real way to perform a production-like testing, hence the best bet is to keep your change as much isolated and limited as possible.
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