MySQL :: MySQL 8.4 Reference Manual :: 29.12.8.2 The hosts Table (original) (raw)

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 theperformance_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 ofTRUNCATE TABLE, seeSection 29.12.8, “Performance Schema Connection Tables”.

• HOST
  The host from which the client connected. This isNULL 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)