Error Log Components •For a sink component, whether it supports an interface to the Performance Schema  error_log  table. •Purpose: Implements filtering based on log event priority and error code, in combination with the  log_error_verbosity  and  log_error_suppression_list  system variables. See Section 5.4.2.5, “Priority-Based Error Log Filtering (log_filter_internal)” . •URN: This component is built in and need not be loaded with  INSTALL COMPONENT  before use. •Multiple uses permitted: No. Filter Error Log Components The log_filter_internal Component Error log filter components implement filtering of error log events. If no filter component is enabled, no filtering occurs. Any enabled filter component affects log events only for components listed later in the log_error_services  value. In particular, for any log sink component listed in  log_error_services earlier than any filter component, no log event filtering occurs. If  log_filter_internal  is disabled,  log_error_verbosity  and  log_error_suppression_list have no effect. The log_filter_dragnet Component Sink Error Log Components The log_sink_internal Component The log_sink_json Component •Purpose: Implements JSON-format error logging. See Section 5.4.2.7, “Error Logging in JSON Format” . •Performance Schema support: Writes to the  error_log  table. Provides a parser for reading error log files created by previous server instances. •Output destination: Writes to the default error log destination. •Multiple uses permitted: No. •URN: This component is built in and need not be loaded with  INSTALL COMPONENT  before use. •Purpose: Implements traditional error log message output format. •Multiple uses permitted: No. •URN:  file://component_log_filter_dragnet •Purpose: Implements filtering based on the rules defined by the  dragnet.log_error_filter_rules system variable setting. See Section 5.4.2.6, “Rule-Based Error Log Filtering (log_filter_dragnet)” . Error log sink components are writers that implement error log output. If no sink component is enabled, no log output occurs. Some sink component descriptions refer to the default error log destination. This is the console or a file and is indicated by the value of the  log_error  system variable, determined as described in Section 5.4.2.2, “Default Error Log Destination Configuration” . 1071