How to Prevent InnoDB Auto-Increment Issues with Duplicate Key Updates?

Preventing InnoDB Auto-Increment on Duplicate Key Updates

In certain scenarios, you may encounter issues with InnoDB auto-incrementing primary key IDs incorrectly incrementing even when using ON DUPLICATE KEY. To resolve this, consider the following:

The problem arises when InnoDB's default auto-increment lock mode assigns non-consecutive values to AUTO_INCREMENT columns upon ON DUPLICATE KEY updates. To rectify this, adjust the innodb_autoinc_lock_mode config option to "0." This sets InnoDB to use the "traditional" auto-increment lock mode, guaranteeing consecutive values for AUTO_INCREMENT columns even with duplicate key updates.

For example:

SET innodb_autoinc_lock_mode = 0;

However, it's crucial to note that the purpose of auto-increment IDs is to provide unique identifiers. Relying on their consecutive nature in your application is not recommended.

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