Why Is My MySQL Server Using So Much CPU?

Troubleshooting High CPU Usage in MySQL

Are you experiencing abnormally high CPU utilization by MySQL? Persistent connections and table optimization may not be the culprits. Let's explore a deeper analysis to identify and resolve the issue.

1. Disable Persistent Connections:

Consider disabling persistent connections, as they can often introduce performance bottlenecks rather than improve it.

2. Check Remote Connections:

Verify that no unauthorized users are accessing MySQL from external servers. This is a crucial security measure.

3. Enable Slow Query Log:

Activate MySQL's Slow Query Log to monitor queries that are consuming excessive time. Identify any queries that may be blocking key tables for extended periods.

4. Analyze Process List:

Execute the following command during CPU spikes:

SHOW PROCESSLIST;

This will display currently running and queued queries, providing insight into their content and execution status.

5. Optimize Memory Allocations:

Monitor buffer sizes, table cache, query cache, and innodb_buffer_pool_size (for innodb tables). Inappropriate memory allocation can impact query performance, leading to increased CPU utilization.

6. Leverage Memory Usage Resources:

Consult the following resources for guidance on MySQL memory usage:

• How MySQL Uses Memory
• MySQL System Variables

7. Utilize a Profiler:

Deploy a profiler to analyze queries executed by your application, identify duplicates, and track their execution time. This can help pinpoint problematic queries.

8. Community Support:

For software such as Drupal, Joomla, or Wordpress, seek guidance within the respective communities. Modules may be available to provide detailed performance insights.

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