(mysql.info) mysql-cluster-overview
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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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