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

• performance_schema_max_sql_text_length 

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The maximum number of bytes used to store SQL statements. The value applies to storage required for these columns: 

•The SQL_TEXT  column of the events_statements_current , events_statements_history , and events_statements_history_long  statement event tables. 

•The QUERY_SAMPLE_TEXT  column of the events_statements_summary_by_digest  summary table. 

Any bytes in excess of performance_schema_max_sql_text_length  are discarded and do not appear in the column. Statements differing only after that many initial bytes are indistinguishable in the column. 

Decreasing the performance_schema_max_sql_text_length  value reduces memory use but causes more statements to become indistinguishable if they differ only at the end. Increasing the value increases memory use but permits longer statements to be distinguished. 

• performance_schema_max_stage_classes 

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