14.4.5 System Tablespace

The InnoDB system tablespace contains the InnoDB data dictionary (metadata for InnoDB-related objects) and is the storage area for the doublewrite buffer, the change buffer, and undo logs. The system tablespace also contains table and index data for any user-created tables that are created in the system tablespace. The system tablespace is considered a shared tablespace since it is shared by multiple tables.

innodb的系統表空間包含了innodb的數據字典(InnoDB相關對象的元數據),也是doublewrite buffer, change buffer,undo logs的存儲區域，同樣的，系統表空間還包含系統表空間中創建的任何用戶創建表的表和索引數據，系統表空間被認爲是一個共享表空間，因爲它是由多個表共享的

The system tablespace is represented by one or more data files. By default, one system data file, named ibdata1, is created in the MySQL data directory. The size and number of system data files is controlled by the innodb_data_file_path startup option.

系統表空間由一個或多個數據文件表示，默認情況下，是一個叫做ibdata1的系統數據文件，這個文件是在MySQL data目錄中創建的,系統數據文件的大小和數量由innodb_data_file_path啓動選項控制

For related information, see Section 14.6.1, “InnoDB Startup Configuration”, and Section 14.7.1, “Resizing the InnoDB System Tablespace”.

相關信息，請看Section 14.6.1, “InnoDB Startup Configuration”和 Section 14.7.1, “Resizing the InnoDB System Tablespace”.