今天介绍InnoDB七种锁的第一种：自增锁(Auto-inc Locks)。 (1)事务A先执行insert，会得到一条(4, xxx)的记录，由于是自增列，故不用显示指定id为4，InnoDB会自动增长，注意此时事务并未提交； (2)事务B后执行insert，假设不会被阻塞，那会得到一条(5, ooo)的记录； 画外音 ...

在mysql中设计表的时候,mysql官方推荐不要使用uuid或者不连续不重复的雪花id(long形且唯一，单机递增),而是推荐连续自增的主键id,官方的推荐是auto_increment,那么为什么不建议采用uuid,使用uuid究竟有什么坏处？ 本篇博客我们就来分析这个问题,探讨一下内部的原因。

本文介绍了 MySQL5.7 中常见的replace into 操作造成的主从auto_increment不一致现象，一旦触发了主从切换，业务的正常插入操作会触发主键冲突的报错提示。 在 MySQL 5.7 版本中，REPLACE INTO 操作在表存在自增主键的情况下，可能会出现表的auto_increment值主从不一致现象 ...

Your browser does not support the audio element. Quite often in my practice, I see people use varchar fields with a small and limited number of available options. Let ...

When creating tables, SQLAlchemy will automatically set AUTO_INCREMENT on the first Integer primary key column which is not marked as a foreign key[...] The id 0 is somehow not even inserted! If one ...

Hello friends, I was facing issue in database. I wanted the auto increment should start from 1. There were 20 rows in table. When I deleted all the rows from the ...

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