[GUIDE] Optimizing MySQL Queries for Massive XenForo Forums

[JackaL]

[GUIDE] Optimizing MySQL Queries for Massive XenForo Forums

As your forum grows past 500k posts, default MySQL configurations will cause high CPU spikes and slow page loads. Here is how to tweak your my.cnf for maximum throughput.

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Key Configurations to Modify:
Open your MySQL configuration file (usually located at /etc/mysql/my.cnf) and optimize these core parameters based on your server RAM:

[mysqld]
innodb_buffer_pool_size = 70% of total RAM (e.g., 7G on a 10GB server)
innodb_log_file_size = 512M
innodb_file_per_table = 1
max_connections = 300
query_cache_type = 0
query_cache_size = 0

Note: Always restart your database service after making changes using systemctl restart mysql and monitor your error logs for any memory allocation warnings.