Why Do MySQL Auto-Increment Values Jump in ClearDB's Master-Master Replication?

MySQL Auto-Increment Column Value Jumps: Understanding the Why and Its Implications

When creating object ID columns with auto-increment functionality in MySQL, users may encounter a seemingly anomalous behavior where the values jump by 10 instead of incrementing by 1. This phenomenon poses two questions:

1. Why Does the Column Value Jump by 10?

The answer lies in ClearDB's implementation of circular replication, which involves using master-master MySQL setups. To prevent key conflicts during replication, ClearDB configures MySQL to skip keys and enforce specific offsets for each used key. Hence, the auto-increment increment is modified to 10 instead of the standard 1. This helps ensure that masters do not use the same keys in all scenarios.

2. Is the Value Jump Problematic?

The documentation provided by ClearDB states that this behavior is intentional and was implemented for future development purposes. However, it does not elaborate on potential implications or disadvantages.

It's important to consider that the value jump could potentially cause confusion or introduce inconsistencies when working with data, especially when integrating with other systems or relying on sequential object IDs. Additionally, it may require additional configurations or workarounds to accommodate the non-sequential increments.

While the behavior itself is not necessarily a problem, it is essential to be aware of its potential consequences and take appropriate measures to mitigate any issues that may arise from the value jump in auto-increment columns.

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