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MySQL 5.7 Reference Manual  /  MySQL 5.7 Frequently Asked Questions  /  MySQL 5.7 FAQ: MySQL Cluster

A.10 MySQL 5.7 FAQ: MySQL Cluster

In the following section, we answer questions that are frequently asked about MySQL Cluster and the NDB storage engine.

A.10.1. Which versions of the MySQL software support Cluster? Do I have to compile from source?
A.10.2. What do “NDB” and “NDBCLUSTER” mean?
A.10.3. How many computers do I need to run a MySQL Cluster, and why?

A.10.1.

Which versions of the MySQL software support Cluster? Do I have to compile from source?

MySQL Cluster is not supported in MySQL Server 5.7 releases. Instead, MySQL Cluster is released as a separate product, available as MySQL Cluster NDB 7.3 and MySQL Cluster NDB 7.4. You should use MySQL Cluster NDB 7.4 for new deployments, and plan to upgrade if you are using a previous version of MySQL Cluster. For an overview of improvements made in MySQL Cluster NDB 7.3, see What is New in MySQL Cluster NDB 7.3; for information about improvements made in MySQL Cluster NDB 7.4, see What is New in MySQL Cluster NDB 7.4.

For detailed information about deploying and using MySQL Cluster, see MySQL Cluster NDB 7.3 and MySQL Cluster NDB 7.4.

A.10.2.

What do NDB and NDBCLUSTER mean?

NDB stands for Network Database. NDB and NDBCLUSTER are both names for the storage engine that enables clustering support with MySQL. NDB is preferred, but either name is correct.

A.10.3.

How many computers do I need to run a MySQL Cluster, and why?

A minimum of three computers is required to run a viable cluster. However, the minimum recommended number of computers in a MySQL Cluster is four: one each to run the management and SQL nodes, and two computers to serve as data nodes. The purpose of the two data nodes is to provide redundancy; the management node must run on a separate machine to guarantee continued arbitration services in the event that one of the data nodes fails.

To provide increased throughput and high availability, you should use multiple SQL nodes (MySQL Servers connected to the cluster). It is also possible (although not strictly necessary) to run multiple management servers.


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