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並前往https://dba.stackexchange.com/questions/102495/how-to-speed-up-query-containing-concat-in-where-clause

How to speed up query containing concat() in WHERE clause?

Please run SHOW GLOBAL VARIABLES LIKE 'key_buffer_size'; to find out. – RolandoMySQLDBA. May 26 '15 at 18:48. key_buffer_size is 167772160.

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