Well, let me say if that happens because there is a logic mistake in your application. But you need to know and understand what happens in MySQL to be able to avoid the problem.
In short the WHY of this article is to inform you about possible pitfalls and how to prevent that to cause you damage.
Let us start by having a short introduction to what Repeatable reads are about. Given I am extremely lazy, I am going to use (a lot) existing documentation from MySQL documentation.
Transaction isolation is one of the foundations of database processing. Isolation is the I in the acronym ACID; the isolation level is the setting that fine-tunes the balance between performance and reliability, consistency, and reproducibility of results when multiple transactions are making changes and performing queries at the …
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