Query the number of mysql connections

MySQL is an open source relational database management system that uses SQL language to query and manage databases. When using MySQL, you can check the status of the database through some commands, including querying the number of connections. Next we will introduce how to query the number of MySQL connections.

1. Use the command line to query the number of MySQL connections

The command line is a text interface that allows you to operate the database by entering commands in the terminal window. To query the number of MySQL connections, you need to run the following command on the command line:

show status like 'Threads_connected';

This command will return the current number of connections. A thread is a separate process used by MySQL to handle each client connection. Therefore, this query returns the number of threads currently connected to the MySQL server.

Example output result:

+-------------------+-------+
| Variable_name     | Value |
+-------------------+-------+
| Threads_connected | 4     |
+-------------------+-------+

The results in the above example show that the number of threads currently connected to the MySQL server is 4.

2. Use the MySQL GUI tool to query the number of connections

In addition to using the command line, you can also use the MySQL GUI tool to query the number of connections. The MySQL GUI tool is a graphical user interface that allows users to operate the database through the mouse and keyboard. The following is how to use Navicat for MySQL to query the number of connections:

1. Open Navicat for MySQL and connect to the database.
2. Select "Monitoring" in the left navigation menu, then select the "Status" tab.
3. In the "Status" tab, you will see a metric called "Threads_connected". The value of this indicator is the number of threads connected to the MySQL server.
4. Click the "Refresh" button to update the value of the "Threads_connected" indicator.

Example output result:

The results in the above example show that the number of threads currently connected to the MySQL server is 6.

Summary:

You can easily query the number of MySQL connections through the command line or the MySQL GUI tool. For running larger applications or websites, it is important to know the number of connections, as too many connections can overload the server, affecting the performance of the application. Therefore, monitoring the number of connections in a timely manner and making necessary adjustments is key to ensuring the normal operation of the application.

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