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MySQL 5.6 Reference Manual
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22.9.7.3 The users Table

As of MySQL 5.6.3, the users table contains a row for each user who has connected to the MySQL server. For each user name, the table counts the current and total number of connections. The table size is autosized at server startup. To set the table size explicitly, set the performance_schema_users_size system variable at server startup. To disable user statistics, set this variable to 0.

The users table has the following columns. For a description of how the Performance Schema maintains rows in this table, including the effect of TRUNCATE TABLE, see Section 22.9.7, “Performance Schema Connection Tables”.

  • USER

    The client user name for the connection. This is NULL for an internal thread, or for a user session that failed to authenticate.

  • CURRENT_CONNECTIONS

    The current number of connections for the user.

  • TOTAL_CONNECTIONS

    The total number of connections for the user.


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