What happens if MySQL's AUTO_INCREMENT column reaches the upper limit of the data type?

When the AUTO_INCREMENT column reaches the upper limit of the data type, subsequent attempts to generate a sequence number will fail. This is why it is recommended to use an integer data type for the AUTO_INCREMENT column that is large enough to hold the maximum sequence value we need. For example, if we use TINYINT, AUTO_INCREMENT can generate only 127 sequence numbers, whereas in case of unsigned TINYINT, the value can be extended to 255.

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