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For more information about memory use during different operations, see Section 8.12.3.1, “How MySQL Uses Memory” . For information about Multi-Range Read optimization, see Section 8.2.1.11, “Multi- Range Read Optimization” . 

• regexp_stack_limit 

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The maximum available memory in bytes for the internal stack used for regular expression matching operations performed by REGEXP_LIKE()  and similar functions (see Section 12.8.2, “Regular Expressions” ). 

• regexp_time_limit 

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The time limit for regular expression matching operations performed by REGEXP_LIKE()  and similar functions (see Section 12.8.2, “Regular Expressions” ). This limit is expressed as the maximum permitted number of steps performed by the match engine, and thus affects execution time only indirectly. Typically, it is on the order of milliseconds. 

• require_row_format 

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