If you are using a dedicated server with a few GB of RAM then you will not have this problem. But if you are running cloud computing with small virtual server like vultr.com then you may end up in this problem: the mysql/mariadb server will run out of memory.

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Real live comparison:

If statement is like walking on the cliff, on each step you need to check your stability otherwise you may fall into abyss.

Try/catch block is like walking on the street, you don't have to care about the road on each step, only when there is an obstacle (something exceptional is happening).

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