先在测试环境测试，没问题再上生产环境，避免生产环境数据库负载过多而崩溃

创建存储过程

DELIMITER //CREATE PROCEDURE batch_add_index_to_email()
BEGINDECLARE done INT DEFAULT FALSE;DECLARE start_id INT DEFAULT 0;DECLARE end_id INT;DECLARE batch_size INT DEFAULT 10000;-- 获取最大的IDSELECT MAX(id) INTO end_id FROM test_table;WHILE start_id < end_id DO-- 在每批次的数据上添加索引SET @sql = CONCAT('ALTER TABLE your_table ADD INDEX idx_email (email);');-- 执行动态 SQLPREPARE stmt FROM @sql;EXECUTE stmt;DEALLOCATE PREPARE stmt;-- 更新批次的起始IDSET start_id = start_id + batch_size;END WHILE;
END //DELIMITER ;

执行存储过程

CALL batch_add_index_to_email()