Why disk space would be needed more than table size while altering table?
Last updated on MARCH 21, 2018
Applies to:MySQL Server - Version 5.6 to 5.7 [Release 5.6 to 5.7]
Information in this document applies to any platform.
During an online DDL operation, temporary tables may or may not be created. It depends on commands and how tables are changed. Sometimes DMLs can be allowed, sometimes not.
Please refer to 'Table 14.6 Summary of Online Status for DDL Operations' in following link.
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