Severalnines Support
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Why use a semi-sync backup master and slaves?
A backup master reduces the impact of a master failure: - No data loss - Simplified reconfiguration of the replication cluster - The overall system is more stable The master handl...
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How do I configure and deploy a recommended MySQL Replication setup?
A MySQL Replication cluster can be configured using the Severalnines Configurator: http://www.severalnines.com/replication-configurator/ The wizard collects some high level data (e.g. IP address...
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Recommended topology for MySQL Replication
A recommended MySQL Replication topology would be constructed so that it takes advantage of the strengths of Replication, and minimizes the weaknesses of the protocol. Some recommendations: - ...
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Issues with MySQL Replication?
Because it is simple to setup, MySQL Replication is probably the most widely used mechanism to provide high availability. Unfortunately, it is also somewhat fragile: - Fail-over is not automa...
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What is MySQL Replication?
Replication enables data from one MySQL server (the master) to be replicated to one or more MySQL servers (the slaves). Replication is asynchronous – slaves need not to be connected permanently to ...
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Schema changes in a Galera cluster
DDL statements are replicated in statement level (and not RBR, as it is the case with DML on InnoDB data).
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Adding a new node to a Galera Replication cluster
Adding a new node is automatic with Galera. It follows the same process as recovering a failed node. When the node is introduced, ClusterControl™ will select a ‘donor’ and do a full state snapshot ...
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Failure handling with ClusterControl™ and Galera
In order to keep the database cluster stable and running, it is important for the system to be resilient to failures. Failures are caused by either software bugs or hardware problems, and can happe...
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How do I deploy a Galera Replication cluster?
A Galera Replication cluster can be configured using the Severalnines Configurator: http://www.severalnines.com/galera-configurator/ The wizard collects some high level data (e.g. IP addresses of ...
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What is Certification based Replication?
Certification based replication uses group communication and transaction ordering techniques to achieve synchronous replication. Transactions execute optimistically in a single node (or replica) an...