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29.12.22.11 The tls_channel_status Table

Connection interface TLS properties are set at server startup, and can be updated at runtime using theALTER INSTANCE RELOAD TLS statement. SeeServer-Side Runtime Configuration and Monitoring for Encrypted Connections.

Thetls_channel_status table provides information about connection interface TLS properties:

mysql> SELECT * FROM performance_schema.tls_channel_status\G*************************** 1. row *************************** CHANNEL: mysql_mainPROPERTY: Enabled   VALUE: Yes*************************** 2. row *************************** CHANNEL: mysql_mainPROPERTY: ssl_accept_renegotiates   VALUE: 0*************************** 3. row *************************** CHANNEL: mysql_mainPROPERTY: Ssl_accepts   VALUE: 2...*************************** 29. row *************************** CHANNEL: mysql_adminPROPERTY: Enabled   VALUE: No*************************** 30. row *************************** CHANNEL: mysql_adminPROPERTY: ssl_accept_renegotiates   VALUE: 0*************************** 31. row *************************** CHANNEL: mysql_adminPROPERTY: Ssl_accepts   VALUE: 0...

Thetls_channel_status table has these columns:

  • CHANNEL

    The name of the connection interface to which the TLS property row applies.mysql_main andmysql_admin are the channel names for the main and administrative connection interfaces, respectively. For information about the different interfaces, seeSection 7.1.12.1, “Connection Interfaces”.

  • PROPERTY

    The TLS property name. The row for theEnabled property indicates overall interface status, where the interface and its status are named in theCHANNEL andVALUE columns, respectively. Other property names indicate particular TLS properties. These often correspond to the names of TLS-related status variables.

  • VALUE

    The TLS property value.

The properties exposed by this table are not fixed and depend on the instrumentation implemented by each channel.

For each channel, the row with aPROPERTY value ofEnabled indicates whether the channel supports encrypted connections, and other channel rows indicate TLS context properties:

  • Formysql_main, theEnabled property isyes orno to indicate whether the main interface supports encrypted connections. Other channel rows display TLS context properties for the main interface.

    For the main interface, similar status information can be obtained using these statements:

    SHOW GLOBAL STATUS LIKE 'current_tls%';SHOW GLOBAL STATUS LIKE 'ssl%';

  • Formysql_admin, theEnabled property isno if the administrative interface is not enabled or it is enabled but does not support encrypted connections.Enabled isyes if the interface is enabled and supports encrypted connections.

    WhenEnabled isyes, the othermysql_admin rows indicate channel properties for the administrative interface TLS context only if some nondefault TLS parameter value is configured for that interface. (This is the case if anyadmin_tls_xxx oradmin_ssl_xxx system variable is set to a value different from its default.) Otherwise, the administrative interface uses the same TLS context as the main interface.

Thetls_channel_status table has no indexes.

TRUNCATE TABLE is not permitted for thetls_channel_status table.