MariaDB 虽源自 MySQL 分叉（诞生于Oracle 收购 MySQL 之后），但历经一段时间发展，如今在开源数据库领域已获得引领性地位。在近几次主要版本更新中，这款数据库不仅增添了很多独特功能，提升了与 MySQL ...

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Learn everything you need to know about SoFi Select 500 ETF (SFY) and how it ranks compared to other funds. Research performance, expense ratio, holdings, and volatility to see if it's the right fund ...

这不是一条 SQL 就搞定的事情吗？ 我曾经负责过的并发量蛮高的商品库存系统，核心扣减逻辑真的就是靠一条 SQL 搞定的。没有引入分布式锁（如 Redis Lock）或者消息队列。 核心思路其实就是数据库层面的乐观锁。利用 MySQL 的行锁特性 + UPDATE 语句的原子性，再配合 Java 中判断影响行数（Affected ...