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MySQL 5.7 Reference Manual
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23.9.8.2 The hosts Table

The hosts table contains a row for each host from which clients have connected to the MySQL server. For each host 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_hosts_size system variable at server startup. To disable host statistics, set this variable to 0.

The hosts 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 23.9.8, “Performance Schema Connection Tables”.

  • HOST

    The host from which the client connected. 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 host.

  • TOTAL_CONNECTIONS

    The total number of connections for the host.


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