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Queries that examine fewer than this number of rows are not logged to the slow query log. 

As of MySQL 8.0.26, setting the session value of this system variable is a restricted operation. The session user must have privileges sufficient to set restricted session variables. See Section 5.1.9.1, “System Variable Privileges” . 

• myisam_data_pointer_size 

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The default pointer size in bytes, to be used by CREATE TABLE  for MyISAM  tables when no MAX_ROWS option is specified. This variable cannot be less than 2 or larger than 7. The default value is 6. See Section B.3.2.10, “The table is full” . 

• myisam_max_sort_file_size 

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