MySQL Show Status: Total Connections vs. Active Connections - What's the Difference?

MySQL Show Status: Interpreting Connection Count

When using MySQL show status to inspect connections, a common question arises: does the reported number represent active connections or total connections established throughout history?

According to MySQL documentation, the value reported when executing 'show status like 'Con%'' reflects the total number of connections made since the database's inception. This count includes both successful and unsuccessful attempts.

To determine the number of active connections at any given moment, two methods can be employed:

1. Threads_connected Status Variable:

   Execute the following command to retrieve the current number of active connections:

   mysql> show status where `variable_name` = 'Threads_connected';

   This variable provides a snapshot of the present number of live connections.

2. Show Processlist Command:

   Running the 'show processlist' command offers a detailed breakdown of all current connections, including information on their ID, user, host, database used, command being executed, and connection state. This can be helpful in identifying any problematic connections.

   mysql> show processlist;

By understanding the difference between total connections and active connections, database administrators can effectively monitor and manage database utilization and performance.

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