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The maximum number of optimizer traces to display. For details, see MySQL Internals: Tracing the Optimizer. 

• optimizer_trace_max_mem_size 

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The maximum cumulative size of stored optimizer traces. For details, see MySQL Internals: Tracing the Optimizer. 

• optimizer_trace_offset 

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The offset of optimizer traces to display. For details, see MySQL Internals: Tracing the Optimizer. 

• performance_schema_ xxx 

Performance Schema system variables are listed in Section 27.15, “Performance Schema System Variables” . These variables may be used to configure Performance Schema operation. 

• parser_max_mem_size 

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