Why Is My MySQL Server Consuming Excessive CPU?

MySQL's Excessive CPU Consumption

Your MySQL server has experienced a significant increase in CPU usage, as evidenced by the high load averages. To investigate the root cause, you should consider the following:

• Disable Persistent Connections: Persistent connections often result in performance issues rather than improvement.
• Check MySQL Users: Ensure that unauthorized remote connections are not accessing your server for malicious purposes.
• Enable MySQL Slow Query Log: Identify any database queries taking excessive time and potentially locking critical tables.
• Monitor Active Queries: Using the SHOW PROCESSLIST command, examine currently running or queued queries to determine if any are consuming excessive CPU resources.
• Optimize Memory Allocation: Review buffer sizes (table, query, and innodb_buffer_pool_size) to ensure adequate memory allocation for optimal performance.
• Consult MySQL Documentation: Refer to the MySQL documentation on topics such as "How MySQL Uses Memory" and "MySQL System Variables" for further guidance.
• Utilize a Query Profiler: Consider using a tool like PHP Profiler to monitor query execution and identify potential performance bottlenecks. Community-specific modules may be available for frameworks like Drupal, Joomla, and WordPress.

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