Programming Tutorials

mysqldumpslow in MySQL - Summarize slow query log.

By: Murali in MySQL Tutorials on 2023-05-17  

mysqldumpslow is a command-line tool that comes with MySQL to analyze the Slow Query Log and summarize its contents. Here's how you can use mysqldumpslow:

1. Locate the Slow Query Log file specified in your MySQL configuration. By default, it is typically located at /var/log/mysql/slow-query.log, but the actual path may vary depending on your system configuration.

2. Open a terminal or command prompt and navigate to the directory where mysqldumpslow is located. On most systems, it should be available in the MySQL bin directory.

3. Run the mysqldumpslow command followed by the path to the Slow Query Log file. For example:

   mysqldumpslow /path/to/slow-query.log
   

   This will provide a summary of the slow queries in the log file, sorted by the query execution time.

4. By default, mysqldumpslow displays the top 10 queries. You can adjust the number of queries displayed by using the -t option followed by the desired number. For example, to display the top 20 queries, use:

   mysqldumpslow -t 20 /path/to/slow-query.log
   

   You can also specify other options to customize the output, such as sorting by different criteria or filtering queries based on specific patterns. Use the mysqldumpslow --help command to see the available options.

mysqldumpslow provides valuable information about the slow queries, including the query time, the number of times the query occurred, and the average query time. This helps identify the most significant performance bottlenecks in your MySQL database.

Note: If mysqldumpslow is not available or not working on your system, you might need to install the MySQL client tools package, which includes mysqldumpslow along with other command-line utilities.