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”.
撤销表空间包含一个或多个包含undo logs文件,innodb的撤销表空间的数量可以用innodb_undo_tablespaces 配置选项来设置，更多信息请看Section 14.7.7, “Configuring Undo Tablespaces”.
Note
innodb_undo_tablespaces is deprecated and will be removed in a future release.
innodb_undo_tablespaces选项是弃用的，并且在未来的发行版里面会被移除
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