许多触发器可以干的事情同样也可以用PostgreSQL规则系统来实现。目前不能用规则来实现的东西之一是某些约束，特别是外键。可以放置一个合格的规则在一列上，这个规则在列的值没有出现在另一个表中时把命令重写成NOTHING。但是这样做数据就会被不声不响地丢弃，因此也不是一个好主意。如果要求检查值的有效性，并且在出现无效值的情况下应该生成一个错误消息，这种需求就必须要用触发器来完成。

文章 2023-07-23 来自：开发者社区

基于数据库与基于ZooKeeper分布式锁的区别

下面是两种常见的分布式锁类型以及它们的底层原理和示例代码：基于数据库的分布式锁：基于数据库的分布式锁通过数据库的事务机制来实现锁机制。它的基本思想是通过在数据库中插入一条唯一的记录作为锁，其他节点在获取锁时会尝试插入相同的记录，如果插入成功，则表示获取到了锁。public class DatabaseLock { private DataSource dataSource; pu...

文章 2022-06-16 来自：开发者社区

异构数据库：HDB Heterogeneous DataBase异构数据库系统是相关的多个数据库系统的集合，可以实现数据的共享和透明访问，每个数据库系统在加入异构数据库系统之前本身就已经存在，拥有自己的DMBS。异构数据库的各个组成部分具有自身的自治性，实现数据共享的同时，每个数据库系统仍保有自己的应用特性、完整性控制和安全性控制。异构数据库系统的异构性主要体现在以下几个方面：计算机体系结构的异....

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满足等保2.0二级和三级 “安全审计”合规要求的同时，智能解析数据库通信流量，细粒度审计数据库访问行为，通过对数据库全量行为的审计溯源、危险攻击的实时告警、风险语句的智能预警，提供数据库资产最安全的监控保障。

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