Description\n-----------\n\nThis functionality is available from MariaDB 11.4.\n\nThe term _Online Schema Change_ refers to the ability to update the table schema without blocking concurrent DML[^1] statements for the duration of the schema change.\n\nExamples\n--------\n\nALTER TABLE items ADD ts TIMESTAMP DEFAULT CURRENT_TIMESTAMP;\n\nURL: https://mariadb.com/docs/server/reference/sql-statements/data-definition/alter/alter-table/online-schema-change