WebbTiDB database documentation. Contribute to Lloyd-Pottiger/pingcap-docs development by creating an account on GitHub. Webb预防死锁. 尽量使用insert来替换insert...on duplicate key updat。insert将在唯一键和主键中添加记录 x 锁,而不是获取间隙锁,因此不会造成死锁。; 使用insert,然后业务上判断duplicate-key错误,进行update操作。; 尽量减少使用唯一键,可以的话从业务层面保证。 总结. mysql锁这块知识真的很多,需要我们平时 ...
MySQL :: MySQL 5.7 Reference Manual :: 13.2.5 INSERT Statement
Webb5 mars 2014 · mysql> INSERT INTO person VALUES (NULL, 'James', 'Seoul') ON DUPLICATE KEY UPDATE address = VALUES(address); Query OK, 1 row affected (0.00 sec) mysql> INSERT INTO person VALUES (NULL, 'Cynthia', 'Yongin') ON DUPLICATE KEY UPDATE address = VALUES(address); Query OK, 1 row affected (0.00 sec) mysql> … WebbEnterprise Hardened Vitual Machines vs Illumina DRAGEN Bio-IT Platform: which is better? Base your decision on 0 verified in-depth peer reviews and ratings, pros & cons, pricing, … cecil westerhof
Klustron 对 MySQL 私有 DML 语法的支持 · GitBook
Webb𝗡𝗲𝘅𝘁 𝗙𝗿𝗶𝗱𝗮𝘆 (𝟭𝟰/𝟬𝟰) 𝗕𝗼𝗼𝗸𝗶𝗻𝗴 𝗶𝘀 𝗵𝗼𝘀𝘁𝗶𝗻𝗴 𝗮 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲 𝗥𝗲𝗹𝗶𝗮𝗯𝗶𝗹𝗶𝘁𝘆 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 𝗠𝗲𝗲𝘁𝘂𝗽! 🤓 Join… Webb20 nov. 2012 · INSERT INTO balances (boardId, points) VALUES (?, ?) ON DUPLICATE KEY SET points=points+VALUES (points) This avoids key collisions in the first place and provides an auditable record of the transactions that occurred. In any case, to do all of this automatically you'd probably have to use a trigger. 3rd party edit From the docs INSERT ... Webb4 aug. 2024 · TiDB 中的视图不可更新,不支持 UPDATE、INSERT、DELETE 等写入操作。 存储引擎 • 仅在语法上兼容创建表时指定存储引擎,实际上 TiDB 会将元信息统一描述为 … butterick b4946