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The maximum number of rows in the events_statements_summary_by_digest  table. If this maximum is exceeded such that a digest cannot be instrumented, the Performance Schema increments the Performance_schema_digest_lost  status variable. 

For more information about statement digesting, see Section 27.10, “Performance Schema Statement Digests and Sampling” . 

• performance_schema_error_size 

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The number of instrumented server error codes. The default value is the actual number of server error codes. Although the value can be set anywhere from 0 to its maximum, the intended use is to set it to either its default (to instrument all errors) or 0 (to instrument no errors). 

Error information is aggregated in summary tables; see Section 27.12.20.11, “Error Summary Tables” . If an error occurs that is not instrumented, information for the occurrence is aggregated to the NULL row in each summary table; that is, to the row with ERROR_NUMBER=0 , ERROR_NAME=NULL , and SQLSTATE=NULL . 

• performance_schema_events_stages_history_long_size 

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The number of rows in the events_stages_history_long  table. 

