mysql 视图查询速度慢

场景：

表 stockpooldata_flash

CREATE TABLE `stockpooldata_flash` (
  `id` bigint(15) NOT NULL AUTO_INCREMENT,
  `formula_id` int(8) DEFAULT NULL,
  `period_type` tinyint(3) DEFAULT NULL,
  `gpMarket` int(4) DEFAULT NULL,
  `gpcode` varchar(20) DEFAULT NULL,
  `ymd` int(11) DEFAULT NULL,
  `hms` int(11) DEFAULT NULL,
  `f1` decimal(18,4) DEFAULT NULL,
  `f2` decimal(18,4) DEFAULT NULL,
  `f3` decimal(18,4) DEFAULT NULL,
  `f4` decimal(18,4) DEFAULT NULL,
  `f5` decimal(18,4) DEFAULT NULL,
  `f6` decimal(18,4) DEFAULT NULL,
  `f7` decimal(18,4) DEFAULT NULL,
  `f8` decimal(18,4) DEFAULT NULL,
  `f9` decimal(18,4) DEFAULT NULL,
  `f10` decimal(18,4) DEFAULT NULL,
  `f11` decimal(18,4) DEFAULT NULL,
  `f12` decimal(18,4) DEFAULT NULL,
  `f13` decimal(18,4) DEFAULT NULL,
  `f14` decimal(18,4) DEFAULT NULL,
  `f15` decimal(18,4) DEFAULT NULL,
  `f16` decimal(18,4) DEFAULT NULL,
  `buyPrice` decimal(18,4) DEFAULT NULL,
  `rise_max` decimal(18,4) DEFAULT NULL,
  `rise_signalDay` decimal(18,4) DEFAULT NULL,
  `high_max` decimal(18,4) DEFAULT NULL,
  `yClose_signalDay` decimal(18,4) DEFAULT NULL,
  `iTime` bigint(15) DEFAULT NULL,
  `MaxRise` decimal(18,4) DEFAULT NULL,
  `Rise_NextDay` decimal(18,4) DEFAULT NULL,
  `MaxRise_NextDay` decimal(18,4) DEFAULT NULL,
  `Rise_FiveDays` decimal(18,4) DEFAULT NULL,
  `MaxRise_FiveDays` decimal(18,4) DEFAULT NULL,
  `Rise_TenDays` decimal(18,4) DEFAULT NULL,
  `MaxRise_TenDays` decimal(18,4) DEFAULT NULL,
  `dayNum` int(8) DEFAULT '-1',
  `tag` varchar(1024) DEFAULT NULL,
  `update_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `index_formulaId_gpcode_ymd` (`formula_id`,`period_type`,`ymd`,`gpMarket`,`gpcode`,`f10`) USING BTREE,
  KEY `index_formulaId_period_ymd` (`formula_id`,`period_type`,`ymd`) USING BTREE,
  KEY `index_formulaId_ymd` (`formula_id`,`ymd`) USING BTREE,
  KEY `index_uptime` (`update_time`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=88197314 DEFAULT CHARSET=utf8;

　建立了一个视图 v_stockpooldata_flash

CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER  VIEW `v_stockpooldata_flash` AS select 
case formula_id
    when '4' then 'DXJJ'
		else `t`.`formula_id`
		end
AS `gscode`,concat(convert(if((`t`.`gpMarket` = 0),'SZ','SH') using utf8),`t`.`gpcode`) AS `gpcode`,`t`.`ymd` AS `ymd`,
( floor(`t`.`hms` / 10000) * 60 + floor(`t`.`hms` % 10000 / 100) ) AS `hms`,
`t`.`f1` AS `f1`, `t`.`f2` AS `f2`, `t`.`f3` AS `f3`, `t`.`f4` AS `f4`, `t`.`f5` AS `f5`, `t`.`f6` AS `f6`, 
case 
	when formula_id = 4 then ( floor(`t`.`f7` / 10000) * 60 + floor(`t`.`f7` % 10000 / 100) )
	else `t`.`f7` end
AS `f7`,
`t`.`f8` AS `f8`, `t`.`f9` AS `f9`, `t`.`f10` AS `f10`, `t`.`f11` AS `f11`, `t`.`f12` AS `f12`, `t`.`f13` AS `f13`, `t`.`f14` AS `f14`, `t`.`f15` AS `f15`, `t`.`f16` AS `f16`, `t`.`rise_max` AS `rise_max`, `t`.`rise_signalDay` AS `rise_signalDay`, `t`.`high_max` AS `high_max`, `t`.`yClose_signalDay` AS `yClose_signalDay`, `t`.`update_time` AS `update_time`
from `stockpooldata_flash` `t`

　　“SELECT * FROM v_stockpooldata_flash where gscode = 'DXJJ' and ymd = 20190123” 语句查询速度太慢：耗时 256.445 s

解决方法：利用源表中的索引 KEY `index_formulaId_period_ymd`

在创建视图时，select `t`.`formula_id` AS `formula_id`

CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER  VIEW `v_stockpooldata_flash` AS select `t`.`formula_id` AS `formula_id`,
case formula_id
    when '4' then 'DXJJ'
		else `t`.`formula_id`
		end
AS `gscode`,concat(convert(if((`t`.`gpMarket` = 0),'SZ','SH') using utf8),`t`.`gpcode`) AS `gpcode`,`t`.`ymd` AS `ymd`,
( floor(`t`.`hms` / 10000) * 60 + floor(`t`.`hms` % 10000 / 100) ) AS `hms`,
`t`.`f1` AS `f1`, `t`.`f2` AS `f2`, `t`.`f3` AS `f3`, `t`.`f4` AS `f4`, `t`.`f5` AS `f5`, `t`.`f6` AS `f6`, 
case 
	when formula_id = 4 then ( floor(`t`.`f7` / 10000) * 60 + floor(`t`.`f7` % 10000 / 100) )
	else `t`.`f7` end
AS `f7`,
`t`.`f8` AS `f8`, `t`.`f9` AS `f9`, `t`.`f10` AS `f10`, `t`.`f11` AS `f11`, `t`.`f12` AS `f12`, `t`.`f13` AS `f13`, `t`.`f14` AS `f14`, `t`.`f15` AS `f15`, `t`.`f16` AS `f16`, `t`.`rise_max` AS `rise_max`, `t`.`rise_signalDay` AS `rise_signalDay`, `t`.`high_max` AS `high_max`, `t`.`yClose_signalDay` AS `yClose_signalDay`, `t`.`update_time` AS `update_time`
from `stockpooldata_flash` `t`

　查询语句改为 “SELECT * FROM v_stockpooldata_flash where formula_id = 4 and ymd = 20190123” 查询效果如下：耗时 0.962 s

来源：oschina

链接：https://my.oschina.net/u/4328407/blog/3660932

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