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This article mainly shows you "what are the advantages and disadvantages of MHA tools in MySQL", the content is simple and easy to understand, and the organization is clear. I hope it can help you solve your doubts. Let Xiaobian lead you to study and learn "what are the advantages and disadvantages of MHA tools in MySQL".

MHA is a set of MySQL failover scheme written by Japanese MySQL Daniel in Perl to ensure high availability of database system. Complete failover and deploy MHA within downtime (usually within 10-30 seconds), avoiding master-slave consistency issues, saving on new server purchases, not affecting server performance, easy to install, and not changing existing deployments.

Advantages of MHA tools:

Open source tools developed by Perl

master automatic monitoring and failover

Master crash does not cause master-slave data inconsistency

Support for GTID-based replication mode (MySQL version 5.7)

MHA is less prone to data loss during failover

The same monitoring node can monitor multiple clusters

MHA strengthens data security

Disadvantages of MHA tools:

Need to script or utilize third-party tools to implement VIP configuration

MHA only monitors the primary database after startup

SSH authentication free configuration is required, and there are certain security risks.

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