Why Does My MySQL Autoincrement Column Sometimes Increment by 10 Instead of 1?

Why Does MySQL's Autoincrement Column Increment by 10?

MySQL's autoincrement feature typically increases values by 1, ensuring sequential and unique identifiers. However, in certain scenarios, such as when hosted on ClearDB, this behavior may be altered, causing the autoincrement column to skip intervals of 10.

According to ClearDB's documentation, this is intentional to accommodate their circular replication system. Each master node in the system is configured with specific offsets for autoincrement keys to prevent conflicts.

Is This a Concern?

Whether autoincrement gaps are a problem depends on the specific application. For most cases, it is not an issue, as gaps do not impact the uniqueness or validity of the identifiers. Additionally, keys assigned by databases should not be considered sequential indices but rather unique markers that adhere to the database's internal logic.

However, if you rely on a strict incremental ordering of keys, ClearDB recommends using generated UUIDs (universally unique identifiers) instead of relying on the autoincrement mechanism. UUIDs provide globally unique identifiers that are not subject to autoincrement skip issues.

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