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• performance_schema_max_file_instances 

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The maximum number of instrumented file objects. For information about how to set and use this variable, see Section 27.7, “Performance Schema Status Monitoring” . 

• performance_schema_max_index_stat 

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The maximum number of indexes for which the Performance Schema maintains statistics. If this maximum is exceeded such that index statistics are lost, the Performance Schema increments the Performance_schema_index_stat_lost  status variable. The default value is autosized using the value of performance_schema_max_table_instances . 

• performance_schema_max_memory_classes 

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The maximum number of memory instruments. For information about how to set and use this variable, see Section 27.7, “Performance Schema Status Monitoring” . 

