How to understand the throughput of MySQL database monitoring metrics

Today, I will talk to you about how to understand the throughput of MySQL database monitoring indicators, which may not be well understood by many people. in order to make you understand better, the editor has summarized the following contents for you. I hope you can get something according to this article.

If your database runs slowly or fails to respond to queries for some reason, every component in the technology stack that relies on the database will suffer performance problems. To ensure the smooth operation of the database, you can monitor the throughput.

Throughput

When monitoring any system, our primary concern should be to ensure that the system can work efficiently. The job of the database is to run the query, so the first task is to ensure that MySQL can execute the query as scheduled.

MySQL has an internal counter called Questions (a server status variable, according to MySQL parlance), whose value is incremented every time the client sends a query.

1. Query the value of Questions server status variable

SHOW GLOBAL STATUS LIKE "Questions"

two。 Monitor the decomposition of read instructions

SHOW GLOBAL STATUS LIKE "Com_select"

3. Monitor the decomposition of write instructions

Writes = Com_insert + Com_update + Com_delete

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