为什么这个MySQL插入这么慢？

Question

CREATE  TABLE IF NOT EXISTS `church` (
  `church_id` INT(11) NOT NULL AUTO_INCREMENT ,
  `name` VARCHAR(40) NOT NULL ,
  `city_id` SMALLINT(4) UNSIGNED ZEROFILL NOT NULL ,
  `validated` TINYINT(1) NULL ,
  PRIMARY KEY (`church_id`) ,
  INDEX `church.city_id-city.city_id_idx` (`city_id` ASC) ,
  UNIQUE INDEX `church-city_id` (`name` ASC, `city_id` ASC) ,
  CONSTRAINT `church.city_id-city.city_id`
    FOREIGN KEY (`city_id` )
    REFERENCES `city` (`city_id` )
    ON DELETE RESTRICT
    ON UPDATE RESTRICT)
ENGINE = InnoDB
DEFAULT CHARACTER SET = utf8

我的localhost（笔记本电脑）上有这个表church。当我对它进行插入时（它现在有10行），需要160毫秒。

• church_id在其他表中用作外键。
• 名称和city_id应该是唯一的。
• city_id是外键

这不是很多，而且我做错了什么？

Answer 1

插入必须做很多工作：

• 锁定表格
• 检查唯一索引约束
• 检查外键约束
• 撰写新记录
• 更新索引
• 解锁表格
• 编写交易日志