17.1.6.5. Limits Associated with Database Objects in MySQL Cluster

Some database objects such as tables and indexes have different limitations when using the NDBCLUSTER storage engine:

Number of database objects. The maximum number of all NDB database objects in a single MySQL Cluster—including databases, tables, and indexes—is limited to 20320.
Attributes per table. The maximum number of attributes (that is, columns and indexes) that can belong to a given table is 512.
Attributes per key. The maximum number of attributes per key is 32.
Row size. The maximum permitted size of any one row is 14000 bytes (as of MySQL Cluster NDB 7.0). Each BLOB or TEXT column contributes 256 + 8 = 264 bytes to this total.