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diff --git a/health/guides/mysql/mysql_galera_cluster_size_max_2m.md b/health/guides/mysql/mysql_galera_cluster_size_max_2m.md deleted file mode 100644 index 0f14ca8af..000000000 --- a/health/guides/mysql/mysql_galera_cluster_size_max_2m.md +++ /dev/null @@ -1,40 +0,0 @@ -### Understand the alert - -This alert calculates the maximum size of the MySQL Galera cluster over a 2-minute period, starting from one minute ago. If you receive this alert, it means that there has been a significant change in the cluster size, which might affect the database's performance, stability, and data consistency. - -### What is MySQL Galera Cluster? - -MySQL Galera Cluster is a synchronous multi-master cluster for MySQL, built on the Galera replication plugin. It provides high-availability and improved performance for MySQL databases by synchronizing data across multiple nodes. - -### What does the cluster size mean? - -The cluster size refers to the number of nodes participating in a MySQL Galera Cluster. An optimal cluster size ensures that the database can handle more significant workloads, handle node failures, and perform automatic failovers. - -### Troubleshoot the alert - -- Determine the current cluster size - - 1. Connect to any node in the cluster and run the following SQL query: - - ``` - SHOW STATUS LIKE 'wsrep_cluster_size'; - ``` - - 2. The query will display the current number of nodes in the cluster. - -- Identify the cause of the cluster size change - - 1. Check the MySQL and Galera logs on all nodes to identify any issues, such as network connectivity issues, node crashes, or hardware problems. - - 2. Review the logs for events such as joining or leaving of the cluster nodes. Look for patterns that could lead to instability (e.g., frequent node join & leave events). - -- Resolve the issue - - 1. Fix any identified problems causing the cluster size change. This may involve monitoring and resolving any network issues, restarting failed nodes, or replacing faulty hardware. - - 2. If necessary, plan and execute a controlled reconfiguration of the Galera cluster to maintain the optimal cluster size. - -### Useful resources - -1. [Galera Cluster Documentation](https://galeracluster.com/library/documentation/) -2. [Monitoring Galera Cluster for MySQL or MariaDB](https://severalnines.com/database-blog/monitoring-galera-cluster-mysql-or-mariadb)
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