An undo tablespace comprises one or more files that contain undo logs. The number of undo tablespaces used by InnoDB is defined by the innodb_undo_tablespaces configuration option. For more information, see Section 14.7.7, “Configuring Undo Tablespaces”.
撤銷表空間包含一個或多個包含undo logs文件,innodb的撤銷表空間的數量可以用innodb_undo_tablespaces 配置選項來設置，更多信息請看Section 14.7.7, “Configuring Undo Tablespaces”.
Note
innodb_undo_tablespaces is deprecated and will be removed in a future release.
innodb_undo_tablespaces選項是棄用的，並且在未來的發行版裏面會被移除
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