Documentation Home
MySQL 8.3 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 40.7Mb
PDF (A4) - 40.8Mb
Man Pages (TGZ) - 294.0Kb
Man Pages (Zip) - 409.0Kb
Info (Gzip) - 4.0Mb
Info (Zip) - 4.0Mb
Excerpts from this Manual

29.12.8.2 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 29.12.8, “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.

  • MAX_SESSION_TOTAL_MEMORY

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

The hosts table has these indexes:

  • Primary key on (HOST)