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MySQL 5.7 Reference Manual  /  ...  /  Limits Associated with Database Objects in MySQL Cluster

19.1.6.5 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:

  • Database and table names.  When using the NDB storage engine, the maximum allowed length both for database names and for table names is 63 characters. A statement using a database name or table name longer than this limit fails with an appropriate error.

  • 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. Each BLOB or TEXT column contributes 256 + 8 = 264 bytes to this total.

  • BIT column storage per table.  The maximum combined width for all BIT columns used in a given NDB table is 4096.


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