記錄一次Mysql慢Sql問題

暫時沒找到原因

表結構

/******************************************/
/*   DatabaseName = bg_scm   */
/*   TableName = demeter_order_deliver   */
/******************************************/
CREATE TABLE `demeter_order_deliver` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'ID',
  `order_no` varchar(64) NOT NULL COMMENT '訂單編號',
  `order_id` bigint(20) NOT NULL COMMENT '訂單ID',
  `order_deliver_no` varchar(64) NOT NULL COMMENT '發貨單編號',
  `stock_no` varchar(32) NOT NULL COMMENT '倉庫編碼',
  `stock_id` bigint(20) NOT NULL COMMENT '倉庫ID',
  `stock_name` varchar(10) NOT NULL COMMENT '倉庫名稱',
  `company_id` bigint(20) NOT NULL COMMENT '訂單所屬公司ID',
  `status` varchar(32) NOT NULL DEFAULT '0' COMMENT '發貨單狀態',
  `weight_total` decimal(8,2) DEFAULT NULL COMMENT '商品總重量',
  `volume_total` decimal(12,2) DEFAULT NULL COMMENT '商品總體積',
  `consignee_realname` varchar(32) NOT NULL COMMENT '收貨人姓名',
  `consignee_telphone` varchar(32) NOT NULL COMMENT '收貨人聯繫電話',
  `province_id` bigint(12) NOT NULL COMMENT '收貨省',
  `city_id` bigint(12) NOT NULL COMMENT '收貨市',
  `district_id` bigint(12) NOT NULL COMMENT '收貨區',
  `street_id` binary(12) DEFAULT NULL COMMENT '街道',
  `province_name` varchar(50) DEFAULT NULL COMMENT '省名稱',
  `city_name` varchar(50) DEFAULT NULL COMMENT '市名稱',
  `county_name` varchar(50) DEFAULT NULL COMMENT '區域名稱',
  `street_name` varchar(50) DEFAULT NULL COMMENT '街道',
  `address` varchar(250) NOT NULL COMMENT '收貨地址',
  `order_remark` varchar(256) DEFAULT NULL COMMENT '訂單備註',
  `statement_date` date DEFAULT NULL COMMENT '訂單歸屬日期',
  `estimate_deliver_date` datetime DEFAULT NULL COMMENT '預計送達時間',
  `real_deliver_date` datetime DEFAULT NULL COMMENT '實際送達時間',
  `out_stock_time` datetime DEFAULT NULL COMMENT '出庫時間',
  `store_id` bigint(20) NOT NULL COMMENT '店鋪id',
  `store_name` varchar(100) DEFAULT NULL COMMENT '店鋪名稱',
  `store_type` varchar(32) DEFAULT NULL COMMENT '店鋪類別',
  `business_type` varchar(32) DEFAULT NULL COMMENT '店鋪業務類型',
  `sort_proportion` int(11) DEFAULT '2' COMMENT '排序比重',
  `type` varchar(32) NOT NULL COMMENT '類型（配送、調度）',
  `route` varchar(20) DEFAULT NULL COMMENT '線路',
  `route_index` varchar(20) DEFAULT NULL COMMENT '線路序號',
  `route_platenumber` varchar(10) DEFAULT NULL COMMENT '車牌',
  `sorting_route` varchar(20) DEFAULT NULL COMMENT '分揀線路',
  `sorting` int(11) DEFAULT NULL COMMENT '分揀口',
  `number` int(11) NOT NULL DEFAULT '0' COMMENT '原始數量',
  `out_number` int(11) NOT NULL DEFAULT '0' COMMENT '出庫數量',
  `out_weight` decimal(12,2) NOT NULL DEFAULT '0.00' COMMENT '出庫重量',
  `out_volume` decimal(12,2) NOT NULL DEFAULT '0.00' COMMENT '出庫體積',
  `create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '創建時間',
  `update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '最後修改時間',
  `station_range_id` bigint(20) DEFAULT NULL COMMENT '配送站點範圍id',
  PRIMARY KEY (`id`),
  UNIQUE KEY `UK_ORDER_DELIVER_IDX` (`order_deliver_no`),
  KEY `NK_PLATE_NUMBER_IDX` (`estimate_deliver_date`,`route_platenumber`),
  KEY `NK_ORDER_NO_IDX` (`order_no`),
  KEY `NK_ORDER_ID_IDX` (`order_id`),
  KEY `NK_DATE_STORE_ID_IDX` (`store_id`,`estimate_deliver_date`) USING BTREE,
  KEY `idx_statement_date` (`statement_date`) USING BTREE,
  KEY `NK_ESTIMATE_COMAPNY_STOCK_IDX` (`estimate_deliver_date`,`company_id`,`stock_id`)
) ENGINE=InnoDB AUTO_INCREMENT=13816094 DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC COMMENT='發貨單明細表'
;

數據量

   SELECT count(1) FROM demeter_order_deliver

 

sql語句

  explain  SELECT *
FROM demeter_order_deliver
WHERE 
     `estimate_deliver_date` >= ?
    AND `estimate_deliver_date` < ? and `company_id` = ?
ORDER BY `id` DESC
LIMIT 0, 10

某天突然sql告警 顯示這條sql執行60多秒 理論上是可以命中esttimate_deliver_date NK_ESTIMATE_COMAPNY_STOCK_IDX索引

我們手動執行以下也顯示正常

    SELECT *FROM demeter_order_deliver
WHERE 
     `estimate_deliver_date` >= '2021-12-03 00:00:00.0'
    AND `estimate_deliver_date` < '2021-12-03 23:59:59.0' and `company_id` = 2
ORDER BY `id` DESC
LIMIT 0, 10

數據行

但是發現以下sql就沒命中索引

    SELECT *
FROM demeter_order_deliver
WHERE 
     `estimate_deliver_date` >= '2021-12-03 00:00:00.0'
    AND `estimate_deliver_date` < '2021-12-03 23:59:59.0' and `company_id` = 3
ORDER BY `id` DESC
LIMIT 0, 10

優化成了主鍵索引 導致全表掃描 條件爲3的數據行數只有1條

 優化改爲強制使用索引

       SELECT *
FROM demeter_order_deliver 
FORCE INDEX(NK_ESTIMATE_COMAPNY_STOCK_IDX)
WHERE 
     `estimate_deliver_date` >= '2021-12-03 00:00:00.0'
    AND `estimate_deliver_date` < '2021-12-03 23:59:59.0' and `company_id` = 3
ORDER BY `id` DESC
LIMIT 0, 10

總結

雖然不知道原因,但是不建議order by id  與limit一起使用