• LOGFILE_GROUP_NAME 

For InnoDB : This is always NULL . 

For NDB : The name of the log file group to which the log file or data file belongs. 

• LOGFILE_GROUP_NUMBER 

For InnoDB : This is always NULL . 

For NDB : For a Disk Data undo log file, the auto-generated ID number of the log file group to which the log file belongs. This is the same as the value shown for the id  column in the ndbinfo.dict_obj_info  table and the log_id  column in the ndbinfo.logspaces  and ndbinfo.logspaces  tables for this undo log file. 

• ENGINE 

For InnoDB : This value is always InnoDB . 

For NDB : This value is always ndbcluster . 

• FULLTEXT_KEYS 

This is always NULL . 

• DELETED_ROWS 

This is always NULL . 

• UPDATE_COUNT 

This is always NULL . 

• FREE_EXTENTS 

For InnoDB : The number of fully free extents in the current data file. 

For NDB : The number of extents which have not yet been used by the file. 

• TOTAL_EXTENTS 

For InnoDB : The number of full extents used in the current data file. Any partial extent at the end of the file is not counted. 

For NDB : The total number of extents allocated to the file. 

• EXTENT_SIZE 

For InnoDB : Extent size is 1048576 (1MB) for files with a 4KB, 8KB, or 16KB page size. Extent size is 2097152 bytes (2MB) for files with a 32KB page size, and 4194304 (4MB) for files with a 64KB page size. FILES  does not report InnoDB  page size. Page size is defined by the innodb_page_size system variable. Extent size information can also be retrieved from the INNODB_TABLESPACES  table where FILES.FILE_ID = INNODB_TABLESPACES.SPACE . 

For NDB : The size of an extent for the file in bytes. 

• INITIAL_SIZE 

For InnoDB : The initial size of the file in bytes. 

