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This is working as intended. The indexes are objects written to the disk. The index creation is also written to the online logs. Creating indexes is expected to take up disk space and cause I/O operations.


That happens when InnoDB compressed tables with large amount of rows are being updated (no matter if the algorithm is in place). Large operations for ALTER tables, will use the "online log", which is expected to consume space. You can check this using SHOW ENGINE INNODB STATUS in the History Length line. This happens always that you have large operations ...

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