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Is there a way to automatically fix MySQL tables where the auto_increment has fallen behind the correct value?
Due to a series of unfortunate events I have some tables where the auto_increment value got behind what it should be.
If the auto_increment value is 9 and there are 20 rows in the table the next 11 INSERTs will fail because the primary key value already exists.
It's possible to fix this manually by selecting the max value of the primary key column and then setting the auto_increment to that plus one. Is it possible to fix these tables programmatically?
1 answer
This is possible in two steps by using a dynamic SQL:
SET @nextId = (SELECT MAX(id) + 1 FROM `CustomTable` );
SET @sql = CONCAT('ALTER TABLE `CustomTable` AUTO_INCREMENT = ', @nextId[]());
PREPARE st FROM @sql;
EXECUTE st;
However, if the values fall frequently you should try to find the underlying cause.
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