Master MySQL Query Profiler: Identify CPU & I/O Bottlenecks Efficiently
This guide explains how to enable MySQL’s Query Profiler, retrieve summary and detailed profiling data, and analyze CPU and I/O usage to pinpoint performance bottlenecks in your queries, including commands to list profiles, view specific query details, and interpret the results for optimization.
To optimize a query you must first identify whether its performance bottleneck stems from excessive CPU computation or heavy I/O operations. MySQL’s Query Profiler provides this insight.
Usage
(1) Enable the profiler by executing the command: SET profiling = 1; (2) After enabling, MySQL automatically records profiling information for every executed query. Run several queries as a test.
(3) Retrieve a summary of the stored profiles with: SHOW PROFILES; (Image showing the output of SHOW PROFILES)
(4) To obtain detailed profiling for a specific query, use its Query_ID from the summary: SHOW PROFILE CPU, BLOCK IO FOR QUERY 5; (Image showing detailed CPU and I/O information for the query)
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