How Can I Accurately Measure MySQL Query Execution Time, Excluding Lock Contention?

Determining Actual MySQL Query Execution Time

Measuring the true execution time of an SQL query is essential to optimize database performance. However, factors such as lock contention can skew results. Here's an alternative method to accurately measure query time:

Solution: MySQL Profiling

MySQL provides a profiler that allows you to measure the time spent in each phase of query execution, excluding lock-related delays. To use this feature:

1. Enable Profiling: Execute the following statement:

   SET profiling = 1;

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2. Execute Query: Run the query you want to measure.

3. Retrieve Profile Data: Issue the following command:

   SHOW PROFILES;

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   This will display a list of queries for which the profiler has collected statistics.

4. Select Query: Identify the query you want to examine and determine its assigned number.

5. Show Profile Details: Execute this command:

   SHOW PROFILE FOR QUERY 1;   // Replace 1 with the query number

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The result will provide a detailed breakdown of the time spent during query execution. This includes:

• Establishing connections
• Preparing statements
• Executing queries
• Fetching results
• Closing connections

Additional Information:

For more comprehensive information on MySQL profiling, refer to the official documentation:

https://dev.mysql.com/doc/refman/8.0/en/show-profile.html

By utilizing MySQL profiling, you can accurately measure the actual execution time of your queries and identify any areas for optimization without the interference of lock-related delays.

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