AI BriefingFrom MySQL Online Alter to a CPU 100% Incident
Key point
This covers the process and incident encountered while attempting an **online alter** to add a new column to a large-scale MySQL table.
Details
The [Cookie Run: Ovenbreak] team needed to add a purchase_dt column and index to the purchase history table to implement a new feature. However, the table was extremely large, so a normal ALTER TABLE risked service disruption due to Table Lock.
The first alternative, MySQL's inplace algorithm, was discarded after testing revealed a Duplicate entry error, confirming a limitation stated in the official documentation.
As an alternative, they chose Percona Toolkit's pt-online-schema-change. This tool changes the schema without service interruption through a process of creating a new table, setting up triggers, copying data, and swapping the table.
The work proceeded in stages, verifying stability through replica testing in the Staging environment and a Dry run.
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