MySQL 9.3 Reference Manual Including MySQL NDB Cluster 9.3

35.5.1 Configuring Log Telemetry

This section describes the configuration for server.

For information on the configured loggers, see Section 29.12.21.1, “The setup_loggers Table”.

Server Configuration System Variables

The following are the server telemetry logging system variables:

Server Configuration Status Variables

This section describes the logger-related status variables.

Server Configuration Command Line

This section describes the logger-related command line configuration options.

  • performance-schema-logger: defines the default values for loggers. This can be defined multiple times, similarly to --performance-schema-instrument.

    In the following example, all loggers are configured with the error level ERROR, except foo and bar which are configured to error level INFO and WARNING, respectively:

                  --performance-schema-logger = 'logger/% = Level:ERROR' --performance-schema-logger = 'logger/foo/% = Level:INFO' 
                  --performance-schema-logger = 'logger/bar/% = Level:WARNING' 
                

    To see the configured loggers, run the following:

    select * from performance_schema.setup_loggers;
    +------------------------+-------+--------------------+
    | NAME                   | LEVEL | DESCRIPTION        |
    +------------------------+-------+--------------------+
    | logger/error/error_log | info  | MySQL error logger |
    +------------------------+-------+--------------------+
                

    This example shows the default MySQL error logger. This can be set to one of the following values:

    • none

    • error

    • warn

    • info

    • debug

    The following example changes the error logging level to WARNING:

    mysql> UPDATE performance_schema.setup_loggers
           SET LEVEL='WARN'
                
  • performance_schema_max_logger_classes: this system variable can also be set from the command line. For example:

                  --performance_schema_max_logger_classes=100
                

    Editing this value requires a server restart.