Why does MySQL consume so much CPU?

MySQL is quite popular among open source web apps, but it is prone to performance issues, if not maintained properly. Performance issues happen primarily through table fragmentation, unoptimized memory settings, and more. All this can result in MySQL high CPU usage, and application errors.

Is MySQL CPU or memory intensive?

MySQL 5.7 + InnoDB: mysqld is CPU bound, with ever increasing memory usage.

How much RAM should MySQL use?

The default configuration is designed to permit a MySQL server to start on a virtual machine that has approximately 512MB of RAM. You can improve MySQL performance by increasing the values of certain cache and buffer-related system variables.

How do you find out the MySQL queries that are consuming very high CPU cycles?

SHOW PROCESSLIST; This will show you any queries that are currently running or in the queue to run, what the query is and what it’s doing (this command will truncate the query if it’s too long, you can use SHOW FULL PROCESSLIST to see the full query text).

Why does MySQL consume more memory?

MySQL tries to allocate more memory than available because we specifically told it to do so. For example: you did not set innodb_buffer_pool_size correctly. This is very easy to fix. There is some other process(es) on the server that allocates RAM.

What causes high database CPU usage?

Short description. Increases in CPU utilization can be caused by several factors, such as user-initiated heavy workloads, multiple concurrent queries, or long-running transactions.

Is 4gb RAM enough for MySQL?

64MB should be enough for most queries. The only time you need to worry about the RAM is when your query time is too long, only after you have done other optimizations such as indexing. Increasing the RAM if you see that many of your queries are going to the disk often. For development work, 64MB is plenty.

How do I troubleshoot MySQL database performance issues?


  1. Check if the MySQL slow query log is enabled.
  2. Shut down the Atlassian applications which use the suspected MySQL server.
  3. Enable the MySQL slow query log.
  4. Restart MySQL after doing this.
  5. Start your Atlassian application back up.
  6. Wait till your Atlassian application has gone through a period of poor behavior.

Which query is taking up more CPU in SQL Server?

If you want to find the top ‘n’ queries that are currently in the cache, which are consuming more CPU, then you are at the right place. sys. dm_exec_query_stats DMV contains all the information about the resource (CPU, Memory, I/O) consuming queries that are currently in the cache.