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The number of rows per thread in the events_waits_history  table. 

• performance_schema_hosts_size 

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The number of rows in the hosts  table. If this variable is 0, the Performance Schema does not maintain connection statistics in the hosts  table or status variable information in the status_by_host  table. 

• performance_schema_max_cond_classes 

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

• performance_schema_max_cond_instances 

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