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MySQL Cluster Overview

 MySQL Cluster Overview

In MySQL Cluster, there is typically no replication of data. It has only data node synchronization

MySQL Cluster is a shared-nothing architecture

  • As a result, no two components of the cluster will share the same hardware.
  • The cluster will be fully operational when at least one node is upon each data node group. As a result, the MySQL cluster avoids single point failure and ensures 99.99% availability.


Replication <--> Cluster

Replication

  • Master-Slave, one server is designated to act as the master.
  • (there is also master-master configuration).
  • Asynchronous - not all nodes have the freshest data at all time
  • No automatic failover

Cluster

  • Internally, the MySQL Cluster also uses synchronous replication.



Replication

Cluster

Asynchronous / synchronous

Asynchronoussynchronous
Automatic failover

No

(a slave has to be promoted to master)

Yes

Downtime when a master fails

YesNo




MySQL InnoDB Cluster

MySQL InnoDB Cluster provides high-availability and scaling features.

MySQL InnoDB Cluster consists of at least three MySQL Server instances.

MySQL InnoDB Cluster usually runs in a single-primary mode, with one primary instance (read-write) and multiple secondary instances (read-only).

  • Table creation and data insertion can be done only on the primary instance.
  • (Advanced users can also take advantage of a multi-primary mode, where all instances are primaries. This is not the common case).

MySQL InnoDB Cluster data nodes are actually a Group Replication.



InnoDB Cluster does not provide support for MySQL NDB Cluster.


MySQL NDB Cluster

A standard MySQL server does not support the MySQL Cluster engine NDB.

  • MySQL Cluster is tightly linked to the MySQL server, yet it’s a separate product.
  • This means we need to install the custom SQL server packaged.


MySQL Galera Cluster

  • Galera Cluster for MySQL is a true Multi-Master Cluster based on synchronous replication.
  • It is a multi-master database cluster that supports synchronous replication
  • https://galeracluster.com/

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