The INFORMATION_SCHEMA FILES Table After running these two statements successfully, you should see a result similar to the one shown here for this query against the  FILES  table: The undo log buffer size information was inadvertently removed in NDB 8.0.13, but was restored in NDB 8.0.15. (Bug #92796, Bug #28800252) Prior to NDB 8.0.13, the  FILES  table contained a row for each of these files on each data node the file belonged to, as well as the size of its undo buffer. In these versions, the result of the same query contains one row per data node, as shown here: • FILES  is a nonstandard  INFORMATION_SCHEMA  table. •As of MySQL 8.0.21, you must have the  PROCESS  privilege to query this table. •Data reported by  FILES  is reported from the  InnoDB  in-memory cache for open files. By comparison, INNODB_DATAFILES  reports data from the  InnoDB SYS_DATAFILES  internal data dictionary table. •The data reported by  FILES  includes global temporary tablespace data. This data is not available in the  InnoDB SYS_DATAFILES  internal data dictionary table, and is therefore not reported by INNODB_DATAFILES . •Undo tablespace data is reported by  FILES  when separate undo tablespaces are present, which they are by default in MySQL 8.0 •The following query returns all data pertinent to  InnoDB  tablespaces. SELECT FILE_ID, FILE_NAME, FILE_TYPE, TABLESPACE_NAME, FREE_EXTENTS, TOTAL_EXTENTS, EXTENT_SIZE, INITIAL_SIZE, MAXIMUM_SIZE, mysql>  SELECT LOGFILE_GROUP_NAME, FILE_TYPE, EXTRA -> FROM INFORMATION_SCHEMA.FILES -> WHERE ENGINE = ’ndbcluster’; USE LOGFILE GROUP mygroup INITIAL_SIZE 256M ENGINE NDBCLUSTER; InnoDB Notes Notes The following notes apply to  InnoDB  data files. 4796 +--------------------+-----------+--------------------------+ | LOGFILE_GROUP_NAME | FILE_TYPE | EXTRA | +--------------------+-----------+--------------------------+ | mygroup | UNDO LOG | UNDO_BUFFER_SIZE=8388608 | | mygroup | DATAFILE | NULL | +--------------------+-----------+--------------------------+ +--------------------+-----------+-----------------------------------------+ | LOGFILE_GROUP_NAME | FILE_TYPE | EXTRA | +--------------------+-----------+-----------------------------------------+ | mygroup | UNDO LOG | CLUSTER_NODE=5;UNDO_BUFFER_SIZE=8388608 | | mygroup | UNDO LOG | CLUSTER_NODE=6;UNDO_BUFFER_SIZE=8388608 | | mygroup | UNDO LOG | CLUSTER_NODE=7;UNDO_BUFFER_SIZE=8388608 | | mygroup | UNDO LOG | CLUSTER_NODE=8;UNDO_BUFFER_SIZE=8388608 | | mygroup | DATAFILE | CLUSTER_NODE=5 | | mygroup | DATAFILE | CLUSTER_NODE=6 | | mygroup | DATAFILE | CLUSTER_NODE=7 | | mygroup | DATAFILE | CLUSTER_NODE=8 | +--------------------+-----------+-----------------------------------------+