Troubleshooting MySQL Thread Performance

Troubleshooting MySQL Thread Performance – MySQL DBA Scripts Series(Tricks and Techniques)


This post is about how we can troubleshoot MySQL Thread performance intuitively.  Several folks have asked me by now about how I do a detailed Performance Audit of MySQL Thread Operations, so I thought would share the details and script I use. Technically, Threads in MySQL are independent functionally as MySQL doesn’t have its Thread operations mechanism of the underlying Operating System. Whenever a user connects with MySQL, a user thread is created within mysqld for the user to execute the queries, and this connection remains till the user disconnects with MySQL Server. The connection management from MySQL client to Server happens via a simple TCP-IP connect message sent to port 3306 on the MySQL server host machine. But, How can we proactively address performance bottlenecks before you hit the thread concurrency bottleneck?  In this blog, I have shared the matrices recommended to troubleshoot MySQL Thread performance more effectively.

What you should know to troubleshoot MySQL Thread performance?

  • How expensive are MySQL Threads?
  • SQL efficiency 
  • System Resource Distribution for Threads 
  • How do MySQL Locks and Wait Events influence Query Performance? 
  • MySQL Transaction Isolation Level Metadata
  • Cost of MySQL Application Performance 
  • MySQL Capacity Utilization 
  • MySQL DBA Checklist for monitoring concurrency level and throughput
  • Trending Data Load Distribution from MySQL Threads

MySQL DBA Script for Troubleshooting Thread Performance 

About Shiv Iyer 452 Articles
Open Source Database Systems Engineer with a deep understanding of Optimizer Internals, Performance Engineering, Scalability and Data SRE. Shiv currently is the Founder, Investor, Board Member and CEO of multiple Database Systems Infrastructure Operations companies in the Transaction Processing Computing and ColumnStores ecosystem. He is also a frequent speaker in open source software conferences globally.