Server System Variables SET_VAR  Hint Applies No Type Boolean Default Value OFF Controls whether the server tracks changes to the state of the current session and notifies the client when state changes occur. Changes can be reported for these attributes of client session state: If the session state tracker is enabled, notification occurs for each change that involves tracked session attributes, even if the new attribute values are the same as the old. For example, setting a user-defined variable to its current value results in a notification. The  session_track_state_change  variable controls only notification of when changes occur, not what the changes are. For example, state-change notifications occur when the default schema is set or tracked session system variables are assigned, but the notification does not include the schema name or variable values. To receive notification of the schema name or session system variable values, use the session_track_schema  or  session_track_system_variables  system variable, respectively. Assigning a value to  session_track_state_change  itself is not considered a state change and is not reported as such. However, if its name listed in the value of  session_track_system_variables , any assignments to it do result in notification of the new value. For more information about session state tracking, see Section 5.1.18, “Server Tracking of Client Session State Changes” . Controls whether the server tracks assignments to session system variables and notifies the client of the name and value of each assigned variable. The variable value is a comma-separated list of variables Command-Line Format --session-track-system-variables=# System Variable session_track_system_variables Scope Global, Session Dynamic Yes SET_VAR  Hint Applies No Type String Default Value time_zone, autocommit, character_set_client, character_set_results, character_set_connection • session_track_system_variables •Prepared statements. •Temporary tables. •User-defined variables. •The default schema (database). •Session-specific values for system variables. Note 875