Online DDL Overview

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MariaDB starting with 10.0

InnoDB and XtraDB tables support online DDL, permitting concurrent DML or in-place alterations in many circumstances.

The following list describes the state of online DDL for various operations

Adding, Dropping, Reordering Columns

The table is rebuilt, but adding, dropping or re-ordering columns can be performed in-place, and, with the exception of adding an auto-increment column, permit concurrent DML. The operation can be expensive as data may require substantial reorganization.

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