Why disk space would be needed more than table size while altering table?
(Doc ID 2084454.1)
Last updated on JANUARY 30, 2019
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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