Mytop is a command that displays MySQL server performance information in a format similar to the Unix top command. It provides real-time updates on important metrics such as queries per second, number of slow queries, thread states, and more. This information can help database administrators monitor the health and performance of the MySQL server.

Use case 1: Starting mytop

Code:

mytop

Motivation: Starting mytop without any additional arguments allows you to quickly launch the command and start monitoring the MySQL server without any specific configuration.

Explanation: This command simply starts mytop without any additional options or parameters.

Example Output:

MySQL on localhost (5.7.31)                   up 0+00:01:29 [17:16:46]
 Queries: 3.0    qps:    0 Slow:     0.0         Se/In/Up/De(%):    0/00/00/00
                qps now:    0 Slow qps: 0.0  Threads:    2 (   1/     1) 00/00/00
     Key Efficiency: 100.0%  Bps in/out:   0.0/  0.0   Now in/out:   0.0/  0.0k

Use case 2: Connecting with a specified username and password

Code:

mytop -u user -p password

Motivation: When accessing a MySQL server, you may need to provide a specific username and password for authentication.

Explanation: The -u option is used to specify the username to connect to the MySQL server, while the -p option is used to specify the password. In this case, replace “user” with the actual username and “password” with the actual password.

Example Output:

MySQL on localhost (5.7.31)                   up 0+00:00:28 [17:18:37]
 Queries: 3.0    qps:    0 Slow:     0.0         Se/In/Up/De(%):    0/00/00/00
                qps now:    0 Slow qps: 0.0  Threads:    2 (   1/     1) 00/00/00
     Key Efficiency: 100.0%  Bps in/out:   0.0/  0.0   Now in/out:   0.0/  0.0k

Use case 3: Connecting with a specified username and prompting for password

Code:

mytop -u user --prompt

Motivation: You may want to avoid specifying the password directly in the command and instead be prompted to enter it securely.

Explanation: In this case, the -u option is used to specify the username to connect to the MySQL server. The --prompt option instructs mytop to prompt for the password instead of specifying it directly in the command. Replace “user” with the actual username.

Example Output:

MySQL on localhost (5.7.31)                   up 0+00:00:33 [17:19:32]
 Queries: 3.0    qps:    0 Slow:     0.0         Se/In/Up/De(%):    0/00/00/00
                qps now:    0 Slow qps: 0.0  Threads:    2 (   1/     1) 00/00/00
     Key Efficiency: 100.0%  Bps in/out:   0.0/  0.0   Now in/out:   0.0/  0.0k

Use case 4: Not showing idle (sleeping) threads

Code:

mytop -u user -p password --noidle

Motivation: When monitoring the MySQL server, you may want to exclude idle threads from the display to focus on the active ones.

Explanation: The --noidle option is used to exclude idle (sleeping) threads from the output. This can help prioritize the display of active threads for better monitoring.

Example Output:

MySQL on localhost (5.7.31)                   up 0+00:01:02 [17:20:59]
 Queries: 3.0    qps:    0 Slow:     0.0         Se/In/Up/De(%):    0/00/00/00
                qps now:    0 Slow qps: 0.0  Threads:    2 (   1/     1) 00/00/00
     Key Efficiency: 100.0%  Bps in/out:   0.0/  0.0   Now in/out:   0.0/  0.0k

Conclusion:

In this article, we explored the different use cases of the mytop command and demonstrated how to start mytop, connect with a specified username and password, connect with a specified username and prompt for the password, and exclude idle threads from the display. By understanding these use cases, you can effectively use mytop to monitor the performance of your MySQL server and identify any potential issues.