What are the restrictions on the use of oak-online-alter-table and pt-online-schema-change in mysql

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Oak-online-alter-table

Usage restrictions:

The table contains at least one unique index with a single column

A unique index that shares a single column between the modified table and the source table

Cannot have a 'AFTER' trigger on a table (because the tool creates an AFTER trigger during execution)

There cannot be foreign keys on the table

The table name does not exceed 57 characters

Pt-online-schema-change

Usage restrictions:

The table must have a primary key or unique foreign key

The tool does not support renaming columns

There cannot be foreign key references on the table

Cannot have trigger on the table

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