前言
大家都知道對于分區字段必須是主鍵的一部分，那么建了復合主鍵之后，是否需要對分許字段再單獨添加一個索引呢？有沒有效果？來驗證一下，下面話不多說了，來一起看看詳細的介紹吧。
1、新建表effect_new(以創建時間按月分區)
CREATE TABLE `effect_new` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `type` tinyint(4) NOT NULL DEFAULT '0', `timezone` varchar(10) DEFAULT NULL, `date` varchar(10) NOT NULL, `hour` varchar(2) DEFAULT NULL, `position` varchar(200) DEFAULT NULL, `country` varchar(32) NOT NULL, `create_time` datetime NOT NULL DEFAULT '1970-01-01 00:00:00', PRIMARY KEY (`id`,`create_time`), KEY `index_date_hour_coun` (`date`,`hour`,`country`)) ENGINE=InnoDB AUTO_INCREMENT=983041 DEFAULT CHARSET=utf8PARTITION BY RANGE (TO_DAYS (`create_time`))(PARTITION p0 VALUES LESS THAN (736754) ENGINE = InnoDB, PARTITION p1 VALUES LESS THAN (736785) ENGINE = InnoDB, PARTITION p2 VALUES LESS THAN (736815) ENGINE = InnoDB, PARTITION p3 VALUES LESS THAN (736846) ENGINE = InnoDB, PARTITION p4 VALUES LESS THAN (736876) ENGINE = InnoDB, PARTITION p5 VALUES LESS THAN (736907) ENGINE = InnoDB, PARTITION p6 VALUES LESS THAN (736938) ENGINE = InnoDB, PARTITION p7 VALUES LESS THAN (736968) ENGINE = InnoDB, PARTITION p8 VALUES LESS THAN (736999) ENGINE = InnoDB, PARTITION p9 VALUES LESS THAN (737029) ENGINE = InnoDB, PARTITION p10 VALUES LESS THAN (737060) ENGINE = InnoDB);
2、插入部分數據數據，
INSERT INTO `effect_new` (`id`, `type`, `timezone`, `date`, `hour`, `position`, `country`, `create_time`) VALUES ('1', '0', 'GMT+8', '2017-07-01', '', 'M-NotiCleanFull-FamilyRecom-0026', '', '2017-07-02 00:07:02');INSERT INTO `effect_new` (`id`, `type`, `timezone`, `date`, `hour`, `position`, `country`, `create_time`) VALUES ('2', '1', 'GMT+8', '2017-09-30', '23', 'Ma5dtJub', 'EG', '2017-10-01 00:00:00');INSERT INTO `effect_new` (`id`, `type`, `timezone`, `date`, `hour`, `position`, `country`, `create_time`) VALUES ('3', '1', 'GMT+8', '2017-09-10', '10', '28', 'DZ', '2017-09-11 00:08:20');INSERT INTO `effect_new` (`id`, `type`, `timezone`, `date`, `hour`, `position`, `country`, `create_time`) VALUES ('4', '1', 'GMT+8', '2017-02-03', '20', '32', 'AD', '2017-02-04 00:00:00');INSERT INTO `effect_new` (`id`, `type`, `timezone`, `date`, `hour`, `position`, `country`, `create_time`) VALUES ('5', '0', 'GMT+8', '2017-03-05', '2', NULL, 'AI', '2017-03-06 02:10:00');INSERT INTO `effect_new` (`id`, `type`, `timezone`, `date`, `hour`, `position`, `country`, `create_time`) VALUES ('6', '0', 'GMT+8', '2017-09-23', '13', 'M-BrandSplash-S-0038', 'AG', '2017-09-23 13:00:00');INSERT INTO `effect_new` (`id`, `type`, `timezone`, `date`, `hour`, `position`, `country`, `create_time`) VALUES ('7', '1', NULL, '2017-10-13', '12', 'BB-Main-AppAd-0018', 'AF', '2017-10-14 12:00:00');INSERT INTO `effect_new` (`id`, `type`, `timezone`, `date`, `hour`, `position`, `country`, `create_time`) VALUES ('8', '0', 'GMT+8', '2017-10-28', '2', 'M-ChargeReminder-S-0040', 'AE', '2017-10-29 00:00:00');INSERT INTO `effect_new` (`id`, `type`, `timezone`, `date`, `hour`, `position`, `country`, `create_time`) VALUES ('9', '1', 'GMT+8', '2017-10-09', NULL, '30', 'AI', '2017-10-10 00:09:00');INSERT INTO `effect_new` (`id`, `type`, `timezone`, `date`, `hour`, `position`, `country`, `create_time`) VALUES ('10', '0', 'GMT+8', '2017-10-05', '5', ' M-BrandSplash', 'LA', '2017-10-06 05:10:00');3、分析語句
EXPLAIN PARTITIONSselect * from effect_new_indexwhere create_time = '2017-10-14 12:00:00'
結果為：
| id | select_type | table | partitions | tpye | possible_keys | key | key_len | ref | rows | filtered | extra |
| 1 | SIMPLE | effect_new | p8 | ALL | null | null | null | null | 391515 | 10 | Using where |
4、給表effect_new添加索引idx_ctime
5、分析添加索引后的執行計劃
結果為：
| id | select_type | table | partitions | tpye | possible_keys | key | key_len | ref | rows | filtered | extra |
| 1 | SIMPLE | effect_new | p8 | ref | idx_ctime | idx_ctime | 5 | const | 60760 | 100 | null |
6、結論：
雖然表已經根據此字段分區，但這不能等同于索引。分了區，只能說該字段為某個值的記錄會在某個分區里面，但不是索引，還要一頓好找。
有時候，主鍵不等于分區依據列，這時候主鍵又想建聚集索引的話，那么必須包含分區依據列，搞成復合主鍵。那么，這種情況下，分區依據列不就有索引了嗎？是的，可是它不夠快，如果在這個復合索引里面，分區依據列不排在第一位，就不夠快，如果查找語句里常常用分區依據列作為過濾條件，就有必要為分區依據列額外單獨建立一個索引。
總結
以上就是這篇文章的全部內容了，本文還有許多不足，希望本文的內容對大家的學習或者工作具有一定的參考學習價值，如果有疑問大家可以留言交流，謝謝大家對VeVb武林網的支持。
新聞熱點
疑難解答
