(mysql.info) mysql-cluster-overview

 
 15.1 MySQL Cluster Overview
 ===========================
 
 MySQL Cluster is a technology that enables clustering of in-memory
 databases in a share-nothing system. The share-nothing architecture
 allows the system to work with very inexpensive hardware, and without
 any specific requirements on hardware or software. It also does not
 have any single point of failure because each component has its own
 memory and disk.
 
 MySQL Cluster integrates the standard MySQL server with an in-memory
 clustered storage engine called `NDB'.  In our documentation, the term
 `NDB' refers to the part of the setup that is specific to the storage
 engine, whereas `MySQL Cluster' refers to the combination of MySQL and
 the `NDB' storage engine.
 
 A MySQL Cluster consists of a set of computers, each running a number
 of processes including MySQL servers, data nodes for NDB Cluster,
 management servers, and (possibly) specialized data access programs.
 The relationship of these components in a cluster is shown here:
 
 MySQL Cluster Components
 
 All these programs work together to form a MySQL Cluster. When data is
 stored in the `NDB Cluster' storage engine, the tables are stored in
 the data nodes. Such tables are directly accessible from all other
 MySQL servers in the cluster.  Thus, in a payroll application storing
 data in a cluster, if one application updates the salary of an
 employee, all other MySQL servers that query this data can see this
 change immediately.
 
 The data stored in the data nodes for MySQL Cluster can be mirrored;
 the cluster can handle failures of individual data nodes with no other
 impact than that a small number of transactions are aborted due to
 losing the transaction state. Because transactional applications are
 expected to handle transaction failure, this should not be a source of
 problems.
 
 By bringing MySQL Cluster to the Open Source world, MySQL AB makes
 clustered data management with high availability, high performance, and
 scalability available to all who need it.
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