10.8.2 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 10.8, “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.

• MAX_SESSION_CONTROLLED_MEMORY

  Reports the maximum amount of controlled memory used by a session belonging to the host.

  This column was added in MySQL 8.0.31.

• MAX_SESSION_TOTAL_MEMORY

  Reports the maximum amount of memory used by a session belonging to the host.

  This column was added in MySQL 8.0.31.

The hosts table has these indexes:

• Primary key on (HOST)