NDB Cluster Disk Data files are created (or dropped) by the user by means of SQL statements intended specifically for this purpose. Such files include the following:
One or more undo log files associated with a log file group
One or more data files associated with a tablespace that uses the logfile group for undo logging
Both undo log files and data files are created in the data node file system directory of each data node (see Section 1.1.2, “NDB Cluster Data Node File System Directory”). The relationship of these files with their log file group and tablespace are shown in the following diagram:
Disk Data files and the SQL statements used to create and drop them are discussed in depth in NDB Cluster Disk Data Tables.