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The mecab_rc_file  option is used when setting up the MeCab full-text parser. 

The mecab_rc_file  option defines the path to the mecabrc  configuration file, which is the configuration file for MeCab. The option is read-only and can only be set at startup. The mecabrc configuration file is required to initialize MeCab. 

For information about the MeCab full-text parser, see Section 12.10.9, “MeCab Full-Text Parser Plugin” . 

For information about options that can be specified in the MeCab mecabrc  configuration file, refer to the MeCab Documentation on the Google Developers site. 

• metadata_locks_cache_size 

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This system variable was removed in MySQL 8.0.13. 

• metadata_locks_hash_instances 

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This system variable was removed in MySQL 8.0.13. 

• min_examined_row_limit 

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