æç« ç®å½
-
- **åè¨**
- **1.è¿åé®é¢ç°åº**
- **2.å¯ä¸ç´¢å¼å段å å«null**
- **3.é»è¾å é¤è¡¨å å¯ä¸ç´¢å¼**
-
- 3.1 å é¤ç¶æ+1
- 3.2 å¢å æ¶é´æ³å段
- 3.3 å¢å idå段
- **4. éå¤åå²æ°æ®å¦ä½å å¯ä¸ç´¢å¼ï¼**
- **5.ç»å¤§å段å å¯ä¸ç´¢å¼**
-
- 5.1 å¢å hashå段
- 5.2 ä¸å å¯ä¸ç´¢å¼
- 5.3 redisåå¸å¼é
- **6.æ¹éæå ¥æ°æ®**
åè¨
å段æ¶é´æ踩è¿ä¸ä¸ªåï¼å¨
mysql8
çä¸å¼
innodb
å¼æç
表
ä¸ï¼å äº
å¯ä¸ç´¢å¼
ï¼ä½æååç°
æ°æ®
ç«ç¶è¿æ¯
éå¤
äºã
å°åºæä¹åäºå¢ï¼
æ¬æéè¿ä¸æ¬¡è¸©åç»åï¼èèå¯ä¸ç´¢å¼ï¼ä¸äºæææçç¥è¯ç¹ã
![](https://img.laitimes.com/img/__Qf2AjLwojIjJCLyojI0JCLicmbw5yMjlTYmFmYjFGMkRTOxUjZ4EmM2cjYkFGM2QWMzgDOj9CX0JXZ252bj91Ztl2Lc52YucWbp5GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.png)
1.è¿åé®é¢ç°åº
å段æ¶é´ï¼ä¸ºäºé²æ¢ååç»äº§çéå¤çæ°æ®ï¼æä¸é¨å äºä¸å¼
é²é表
ã
å¦æ大家对é²é表ï¼æ¯è¾æå ´è¶£ï¼å¯ä»¥ççæçå¦ä¸ç¯æç« ãCREATE TABLE `product_group_unique` (
`id` bigint NOT NULL,
`category_id` bigint NOT NULL,
`unit_id` bigint NOT NULL,
`model_hash` varchar(255) COLLATE utf8mb4_bin DEFAULT NULL,
`in_date` datetime NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;
为äºä¿è¯æ°æ®ç
å¯ä¸æ§
ï¼æç»é£ç§ååç»é²é表ï¼å»ºäºå¯ä¸ç´¢å¼ï¼
alter table product_group_unique add unique index
ux_category_unit_model(category_id,unit_id,model_hash);
æ ¹æ®åç±»ç¼å·ãåä½ç¼å·åååç»å±æ§çhashå¼ï¼å¯ä»¥å¯ä¸ç¡®å®ä¸ä¸ªååç»ã
ç»ååç»é²é表å建äº
å¯ä¸ç´¢å¼
ä¹åï¼ç¬¬äºå¤©æ¥çæ°æ®ï¼åç°è¯¥è¡¨ä¸ç«ç¶äº§çäºéå¤çæ°æ®ï¼
表ä¸ç¬¬äºæ¡æ°æ®å第ä¸æ¡æ°æ®éå¤äºã
è¿æ¯ä¸ºä»ä¹å¢ï¼
2.å¯ä¸ç´¢å¼å段å å«null
å¦æä½ ä»ç»æ¥ç表ä¸çæ°æ®ï¼ä¼åç°å ¶ä¸ä¸ä¸ªæ¯è¾ç¹æ®å°æ¹ï¼ååç»å±æ§çhashå¼ï¼model_hashå段ï¼å¯è½ä¸º
null
ï¼å³ååç»å 许ä¸é 置任ä½å±æ§ã
å¨product_group_unique表ä¸æå ¥äºä¸æ¡model_hashå段çäº100çéå¤æ°æ®ï¼
æ§è¡ç»æï¼ä»ä¸å¾ä¸çåºï¼mysqlçå¯ä¸æ§çº¦æçæäºï¼éå¤æ°æ®è¢«æ¦æªäºã
æ¥ä¸æ¥ï¼æ们åæå ¥ä¸¤æ¡model_hash为nullçæ°æ®ï¼å ¶ä¸ç¬¬ä¸æ¡æ°æ®è·ç¬¬äºæ¡æ°æ®ä¸category_idãunit_idåmodel_hashå段å¼é½ä¸æ ·ã
ä»å¾ä¸çåºï¼ç«ç¶æ§è¡æåäºã
æ¢å¥è¯è¯´ï¼å¦æå¯ä¸ç´¢å¼çå段ä¸ï¼åºç°äºnullå¼ï¼åå¯ä¸æ§çº¦æä¸ä¼çæã
æç»æå ¥çæ°æ®æ åµæ¯è¿æ ·çï¼
- å½model_hashå段ä¸ä¸ºç©ºæ¶ï¼ä¸ä¼äº§çéå¤çæ°æ®ã
- å½model_hashå段为空æ¶ï¼ä¼çæéå¤çæ°æ®ã
æ们éè¦ç¹å«æ³¨æï¼å建å¯ä¸ç´¢å¼çå段ï¼é½ä¸è½å 许为nullï¼å¦åmysqlçå¯ä¸æ§çº¦æå¯è½ä¼å¤±æã
3.é»è¾å é¤è¡¨å å¯ä¸ç´¢å¼
æ们é½ç¥éå¯ä¸ç´¢å¼é常ç®å好ç¨ï¼ä½ææ¶åï¼å¨è¡¨ä¸å®å¹¶ä¸å¥½å ã
ä¸ä¿¡ï¼æ们ä¸èµ·å¾ä¸çã
é常æ åµä¸ï¼è¦å é¤è¡¨çææ¡è®°å½çè¯ï¼å¦æç¨
delete
è¯å¥æä½çè¯ã
ä¾å¦ï¼
è¿ç§deleteæä½æ¯
ç©çå é¤
ï¼å³è¯¥è®°å½è¢«å é¤ä¹åï¼åç»éè¿sqlè¯å¥åºæ¬æ¥ä¸åºæ¥ãï¼ä¸è¿éè¿å ¶ä»ææ¯æ段å¯ä»¥æ¾åï¼é£æ¯åè¯äºï¼
è¿æå¦å¤ä¸ç§æ¯
é»è¾å é¤
ï¼ä¸»è¦æ¯éè¿
update
è¯å¥æä½çã
ä¾å¦ï¼
update product set delete_status=1,edit_time=now(3)
where id=123;
é»è¾å é¤éè¦å¨è¡¨ä¸é¢å¤å¢å ä¸ä¸ªå é¤ç¶æå段ï¼ç¨äºè®°å½æ°æ®æ¯å¦è¢«å é¤ãå¨ææçä¸å¡æ¥è¯¢çå°æ¹ï¼é½éè¦è¿æ»¤æå·²ç»å é¤çæ°æ®ã
éè¿è¿ç§æ¹å¼å é¤æ°æ®ä¹åï¼æ°æ®ä»»ç¶è¿å¨è¡¨ä¸ï¼åªæ¯ä»é»è¾ä¸è¿æ»¤äºå é¤ç¶æçæ°æ®èå·²ã
å ¶å®å¯¹äºè¿ç§é»è¾å é¤ç表ï¼æ¯æ²¡æ³å å¯ä¸ç´¢å¼çã
为ä»ä¹å¢ï¼
å设ä¹åç»åå表ä¸ç
name
å
model
å äºå¯ä¸ç´¢å¼ï¼å¦æç¨æ·æææ¡è®°å½å é¤äºï¼delete_status设置æ1äºãåæ¥ï¼è¯¥ç¨æ·åç°ä¸å¯¹ï¼åéæ°æ·»å äºä¸æ¨¡ä¸æ ·çååã
ç±äºå¯ä¸ç´¢å¼çåå¨ï¼è¯¥ç¨æ·ç¬¬äºæ¬¡æ·»å ååä¼å¤±è´¥ï¼å³ä½¿è¯¥ååå·²ç»è¢«å é¤äºï¼ä¹æ²¡æ³åæ·»å äºã
è¿ä¸ªé®é¢æ¾ç¶æç¹ä¸¥éã
æ人å¯è½ä¼è¯´ï¼æ
name
ã
model
å
delete_status
ä¸ä¸ªå段åæ¶åæ
å¯ä¸ç´¢å¼
ä¸å°±è¡äºï¼
çï¼è¿æ ·åç¡®å®å¯ä»¥è§£å³ç¨æ·é»è¾å é¤äºæ个ååï¼åæ¥åéæ°æ·»å ç¸åçååæ¶ï¼æ·»å ä¸äºçé®é¢ãä½å¦æ第äºæ¬¡æ·»å çååï¼å被å é¤äºã该ç¨æ·ç¬¬ä¸æ¬¡æ·»å ç¸åçååï¼ä¸ä¹åºç°é®é¢äºï¼
ç±æ¤å¯è§ï¼å¦æ表ä¸æé»è¾å é¤åè½ï¼æ¯ä¸æ¹ä¾¿å建å¯ä¸ç´¢å¼çã
ä½å¦æççæ³ç»å å«é»è¾å é¤ç表ï¼å¢å å¯ä¸ç´¢å¼ï¼è¯¥æä¹åå¢ï¼
3.1 å é¤ç¶æ+1
éè¿åé¢ç¥éï¼å¦æ表ä¸æé»è¾å é¤åè½ï¼æ¯ä¸æ¹ä¾¿å建å¯ä¸ç´¢å¼çã
å ¶æ ¹æ¬åå æ¯ï¼è®°å½è¢«å é¤ä¹åï¼delete_statusä¼è¢«è®¾ç½®æ1ï¼é»è®¤æ¯0ãç¸åçè®°å½ç¬¬äºæ¬¡å é¤çæ¶åï¼delete_status被设置æ1ï¼ä½ç±äºå建äºå¯ä¸ç´¢å¼ï¼ænameãmodelådelete_statusä¸ä¸ªå段åæ¶åæå¯ä¸ç´¢å¼ï¼ï¼æ°æ®åºä¸å·²åå¨delete_status为1çè®°å½ï¼æ以è¿æ¬¡ä¼æä½å¤±è´¥ã
æ们为å¥ä¸æ¢ä¸ç§æèï¼ä¸è¦çº ç»äºdelete_status为1ï¼è¡¨ç¤ºå é¤ï¼å½delete_status为1ã2ã3ççï¼åªè¦å¤§äº1é½è¡¨ç¤ºå é¤ã
è¿æ ·çè¯ï¼æ¯æ¬¡å é¤é½è·åé£æ¡ç¸åè®°å½çæ大å é¤ç¶æï¼ç¶åå 1ã
è¿æ ·æ°æ®æä½è¿ç¨åæï¼
- æ·»å è®°å½aï¼delete_status=0ã
- å é¤è®°å½aï¼delete_status=1ã
- æ·»å è®°å½aï¼delete_status=0ã
- å é¤è®°å½aï¼delete_status=2ã
- æ·»å è®°å½aï¼delete_status=0ã
- å é¤è®°å½aï¼delete_status=3ã
ç±äºè®°å½aï¼æ¯æ¬¡å é¤æ¶ï¼delete_statusé½ä¸ä¸æ ·ï¼æ以å¯ä»¥ä¿è¯å¯ä¸æ§ã
该æ¹æ¡çä¼ç¹æ¯ï¼ä¸ç¨è°æ´å段ï¼é常ç®ååç´æ¥ã
缺ç¹æ¯ï¼å¯è½éè¦ä¿®æ¹sqlé»è¾ï¼ç¹å«æ¯æäºæ¥è¯¢sqlè¯å¥ï¼æäºä½¿ç¨delete_status=1å¤æå é¤ç¶æçï¼éè¦æ¹ædelete_status>=1ã
3.2 å¢å æ¶é´æ³å段
导è´é»è¾å é¤è¡¨ï¼ä¸å¥½å å¯ä¸ç´¢å¼ææ ¹æ¬çå°æ¹å¨é»è¾å é¤é£éã
æ们为ä»ä¹ä¸å 个å段ï¼ä¸é¨å¤çé»è¾å é¤çåè½å¢ï¼
çï¼å¯ä»¥å¢å
æ¶é´æ³
å段ã
ænameãmodelãdelete_statusåtimeStampï¼å个å段åæ¶åæå¯ä¸ç´¢å¼
å¨æ·»å æ°æ®æ¶ï¼timeStampå段åå ¥é»è®¤å¼
1
ã
ç¶åä¸æ¦æé»è¾å é¤æä½ï¼åèªå¨å¾è¯¥å段åå ¥æ¶é´æ³ã
è¿æ ·å³ä½¿æ¯åä¸æ¡è®°å½ï¼é»è¾å é¤å¤æ¬¡ï¼æ¯æ¬¡çæçæ¶é´æ³ä¹ä¸ä¸æ ·ï¼ä¹è½ä¿è¯æ°æ®çå¯ä¸æ§ã
æ¶é´æ³ä¸è¬ç²¾ç¡®å°
ç§
ã
é¤éå¨é£ç§æé并åçåºæ¯ä¸ï¼å¯¹åä¸æ¡è®°å½ï¼ä¸¤æ¬¡ä¸åçé»è¾å é¤æä½ï¼äº§çäºç¸åçæ¶é´æ³ã
è¿æ¶å¯ä»¥å°æ¶é´æ³ç²¾ç¡®å°
毫ç§
ã
该æ¹æ¡çä¼ç¹æ¯ï¼å¯ä»¥å¨ä¸æ¹åå·²æ代ç é»è¾çåºç¡ä¸ï¼éè¿å¢å æ°å段å®ç°äºæ°æ®çå¯ä¸æ§ã
缺ç¹æ¯ï¼å¨æéçæ åµä¸ï¼å¯è½è¿æ¯ä¼äº§çéå¤æ°æ®ã
3.3 å¢å idå段
å ¶å®ï¼å¢å æ¶é´æ³å段åºæ¬å¯ä»¥è§£å³é®é¢ãä½å¨å¨æéçæ åµä¸ï¼å¯è½è¿æ¯ä¼äº§çéå¤æ°æ®ã
æ没æåæ³è§£å³è¿ä¸ªé®é¢å¢ï¼
çï¼å¢å
主é®
å段ï¼delete_idã
该æ¹æ¡çæè·¯è·å¢å æ¶é´æ³å段ä¸è´ï¼å³å¨æ·»å æ°æ®æ¶ç»delete_id设置é»è®¤å¼1ï¼ç¶åå¨é»è¾å é¤æ¶ï¼ç»delete_idèµå¼æå½åè®°å½ç主é®idã
ænameãmodelãdelete_statusådelete_idï¼å个å段åæ¶åæå¯ä¸ç´¢å¼ã
è¿å¯è½æ¯æä¼æ¹æ¡ï¼æ éä¿®æ¹å·²æå é¤é»è¾ï¼ä¹è½ä¿è¯æ°æ®çå¯ä¸æ§ã
4. éå¤åå²æ°æ®å¦ä½å å¯ä¸ç´¢å¼ï¼
åé¢èè¿å¦æ表ä¸æé»è¾å é¤åè½ï¼ä¸å¤ªå¥½å å¯ä¸ç´¢å¼ï¼ä½éè¿æä¸ä»ç»çä¸ç§æ¹æ¡ï¼å¯ä»¥é¡ºå©çå ä¸å¯ä¸ç´¢å¼ã
ä½æ¥èªçµéçä¸é®ï¼å¦ææå¼ è¡¨ä¸ï¼å·²åå¨
åå²éå¤æ°æ®
ï¼è¯¥å¦ä½å ç´¢å¼å¢ï¼
æç®åçåæ³æ¯ï¼å¢å ä¸å¼
é²é表
ï¼ç¶åææ°æ®åå§åè¿å»ã
å¯ä»¥åä¸æ¡ç±»ä¼¼è¿æ ·çsqlï¼
insert into product_unqiue(id,name,category_id,unit_id,model)
select max(id), select name,category_id,unit_id,model from product
group by name,category_id,unit_id,model;
è¿æ ·åå¯ä»¥æ¯å¯ä»¥ï¼ä½ä»å¤©ç主é¢æ¯ç´æ¥å¨å表ä¸å å¯ä¸ç´¢å¼ï¼ä¸ç¨é²é表ã
é£ä¹ï¼è¿ä¸ªå¯ä¸ç´¢å¼è¯¥æä¹å å¢ï¼
å ¶å®å¯ä»¥åé´ä¸ä¸èä¸ï¼å¢å
id
å段çæè·¯ã
å¢å ä¸ä¸ªdelete_idå段ã
ä¸è¿å¨ç»product表å建å¯ä¸ç´¢å¼ä¹åï¼å è¦åæ°æ®å¤çã
è·åç¸åè®°å½çæ大idï¼
select max(id), select name,category_id,unit_id,model from product
group by name,category_id,unit_id,model;
ç¶åå°delete_idå段设置æ1ã
ç¶åå°å ¶ä»çç¸åè®°å½çdelete_idå段ï¼è®¾ç½®æå½åç主é®ã
è¿æ ·å°±è½åºååå²çéå¤æ°æ®äºã
å½ææçdelete_idå段é½è®¾ç½®äºå¼ä¹åï¼å°±è½ç»nameãmodelãdelete_statusådelete_idï¼å个å段å å¯ä¸ç´¢å¼äºã
å®ç¾ã
5.ç»å¤§å段å å¯ä¸ç´¢å¼
æ¥ä¸æ¥ï¼æ们èä¸ä¸ªæ趣çè¯é¢ï¼å¦ä½ç»å¤§å段å¢å å¯ä¸ç´¢å¼ã
ææ¶åï¼æ们éè¦ç»å 个å段åæ¶å ä¸ä¸ªå¯ä¸ç´¢å¼ï¼æ¯å¦ç»nameãmodelãdelete_statusådelete_idçã
ä½å¦æmodelå段å¾å¤§ï¼è¿æ ·å°±ä¼å¯¼è´è¯¥å¯ä¸ç´¢å¼ï¼å¯è½ä¼å ç¨è¾å¤åå¨ç©ºé´ã
æ们é½ç¥éå¯ä¸ç´¢å¼ï¼ä¹ä¼èµ°ç´¢å¼ã
å¦æå¨ç´¢å¼çå个èç¹ä¸å大æ°æ®ï¼æ£ç´¢æçä¼é常ä½ã
ç±æ¤ï¼æå¿ è¦å¯¹å¯ä¸ç´¢å¼é¿åº¦åéå¶ã
ç®åmysql innodbåå¨å¼æä¸ç´¢å¼å 许çæ大é¿åº¦æ¯3072 bytesï¼å ¶ä¸unqiue keyæ大é¿åº¦æ¯1000 bytesã
å¦æå段太大äºï¼è¶ è¿äº1000 bytesï¼æ¾ç¶æ¯æ²¡æ³å å¯ä¸ç´¢å¼çã
æ¤æ¶ï¼æ没æ解å³åæ³å¢ï¼
5.1 å¢å hashå段
æ们å¯ä»¥å¢å ä¸ä¸ªhashå段ï¼å大å段çhashå¼ï¼çæä¸ä¸ªè¾ççæ°å¼ã该å¼å¯ä»¥éè¿ä¸äºhashç®æ³çæï¼åºå®é¿åº¦16ä½æè 32ä½çã
æ们åªéè¦ç»nameãhashãdelete_statusådelete_idå段ï¼å¢å å¯ä¸ç´¢å¼ã
è¿æ ·å°±è½é¿å å¯ä¸ç´¢å¼å¤ªé¿çé®é¢ã
ä½å®ä¹ä¼å¸¦æ¥ä¸ä¸ªæ°é®é¢ï¼
ä¸è¬hashç®æ³ä¼äº§çhashå²çªï¼å³ä¸¤ä¸ªä¸åçå¼ï¼éè¿hashç®æ³çæå¼ç¸åã
å½ç¶å¦æè¿æå ¶ä»å段å¯ä»¥åºåï¼æ¯å¦ï¼nameï¼å¹¶ä¸ä¸å¡ä¸å 许è¿ç§éå¤çæ°æ®ï¼ä¸åå ¥æ°æ®åºï¼è¯¥æ¹æ¡ä¹æ¯å¯è¡çã
5.2 ä¸å å¯ä¸ç´¢å¼
å¦æå®å¨ä¸å¥½å å¯ä¸ç´¢å¼ï¼å°±ä¸å å¯ä¸ç´¢å¼ï¼éè¿å ¶ä»ææ¯æ段ä¿è¯å¯ä¸æ§ã
å¦ææ°å¢æ°æ®çå ¥å£æ¯è¾å°ï¼æ¯å¦åªæjobï¼æè æ°æ®å¯¼å ¥ï¼å¯ä»¥å线ç¨é¡ºåºæ§è¡ï¼è¿æ ·å°±è½ä¿è¯è¡¨ä¸çæ°æ®ä¸éå¤ã
å¦ææ°å¢æ°æ®çå ¥å£æ¯è¾å¤ï¼æç»é½åmqæ¶æ¯ï¼å¨mqæ¶è´¹è ä¸å线ç¨å¤çã
5.3 redisåå¸å¼é
ç±äºå段太大äºï¼å¨mysqlä¸ä¸å¥½å å¯ä¸ç´¢å¼ï¼ä¸ºä»ä¹ä¸ç¨
redisåå¸å¼é
å¢ï¼
ä½å¦æç´æ¥å ç»nameãmodelãdelete_statusådelete_idå段ï¼å
redisåå¸å¼é
ï¼æ¾ç¶æ²¡å¥æä¹ï¼æçä¹ä¸ä¼é«ã
æ们å¯ä»¥ç»å5.1ç« èï¼ç¨nameãmodelãdelete_statusådelete_idå段ï¼çæä¸ä¸ªhashå¼ï¼ç¶åç»è¿ä¸ªæ°å¼å éã
å³ä½¿éå°hashå²çªä¹æ²¡å ³ç³»ï¼å¨å¹¶åçæ åµä¸ï¼æ¯ç«æ¯å°æ¦çäºä»¶ã
6.æ¹éæå ¥æ°æ®
æäºå°ä¼ä»¬ï¼å¯è½è®¤ä¸ºï¼æ¢ç¶æredisåå¸å¼éäºï¼å°±å¯ä»¥ä¸ç¨å¯ä¸ç´¢å¼äºã
é£æ¯ä½ 没éå°ï¼æ¹éæå ¥æ°æ®çåºæ¯ã
åå¦éè¿æ¥è¯¢æä½ä¹åï¼åç°æä¸ä¸ªéåï¼listçæ°æ®ï¼éè¦æ¹éæå ¥æ°æ®åºã
å¦æ使ç¨redisåå¸å¼éï¼éè¦è¿æ ·æä½ï¼
for(Product product: list) {
try {
String hash = hash(product);
rLock.lock(hash);
//æ¥è¯¢æ°æ®
//æå
¥æ°æ®
} catch (InterruptedException e) {
log.error(e);
} finally {
rLock.unlock();
}
}
éè¦å¨ä¸ä¸ªå¾ªç¯ä¸ï¼ç»æ¯æ¡æ°æ®é½å éã
è¿æ ·æ§è½è¯å®ä¸ä¼å¥½ã
å½ç¶æäºå°ä¼ä¼´æå对æè§ï¼è¯´ä½¿ç¨redisç
pipeline
æ¹éæä½ä¸å°±å¯ä»¥äºï¼
ä¹å°±æ¯ä¸æ¬¡æ§ç»500æ¡ï¼æè 1000æ¡æ°æ®ä¸éï¼æå使ç¨å®ä¸æ¬¡æ§éæ¾è¿äºéï¼
æ³æ³é½æç¹ä¸é è°±ï¼è¿ä¸ªéå¾æå¤å¤§åã
æ容æé æéè¶ æ¶ï¼æ¯å¦ä¸å¡ä»£ç é½æ²¡ææ§è¡å®ï¼éçè¿ææ¶é´å°±å·²ç»å°äºã
é对è¿ç§æ¹éæä½ï¼å¦ææ¤æ¶ä½¿ç¨mysqlçå¯ä¸ç´¢å¼ï¼ç´æ¥æ¹éinsertå³å¯ï¼ä¸æ¡sqlè¯å¥å°±è½æå®ã
æ°æ®åºä¼èªå¨å¤æï¼å¦æåå¨éå¤çæ°æ®ï¼ä¼æ¥éãå¦æä¸åå¨éå¤æ°æ®ï¼æå 许æå ¥æ°æ®ã