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

• performance_schema_max_digest_length 

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The maximum number of bytes of memory reserved per statement for computation of normalized statement digest values in the Performance Schema. This variable is related to max_digest_length ; see the description of that variable in Section 5.1.8, “Server System Variables” . 

For more information about statement digesting, including considerations regarding memory use, see Section 27.10, “Performance Schema Statement Digests and Sampling” . 

• performance_schema_max_digest_sample_age 

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This variable affects statement sampling for the events_statements_summary_by_digest  table. When a new table row is inserted, the statement that produced the row digest value is stored as the current sample statement associated with the digest. Thereafter, when the server sees other statements with the same digest value, it determines whether to use the new statement to replace the current sample statement (that is, whether to resample). Resampling policy is based on the comparative wait 

