The serializable isolation level is the least restrictive level defined by the ANSI SQL standard.

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The serializable isolation level is actually the highest level of isolation defined by the ANSI SQL standard. It guarantees that transactions will appear to run in a completely isolated manner, as if they were executed sequentially one after the other. This level offers the strongest protection against concurrency issues but can also lead to performance issues in high-concurrency environments.

The Serializable Isolation Level Is the Least Restrictive Level Defined