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文章 2024-10-09 来自：开发者社区

一个项目用5款数据库？MySQL、PostgreSQL、ClickHouse、MongoDB区别，适用场景

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阿里云文档 2023-09-03

触发器和规则系统规则vs触发器有哪些区别？_云原生数据库PolarDB PostgreSQL版（兼容Oracle）_云原生数据库 PolarDB(PolarDB)

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。

问答 2022-09-27 来自：开发者社区

项目空间配置里面有个测试库和线上库的配置，然后每个任务里面又有一个数据库的选择配置，这三个有什么区别

数仓开发里面，项目空间配置里面有个测试库和线上库的配置，然后每个任务里面又有一个数据库的选择配置，这三个有什么区别，为什么我配了测试库和线上库，到具体的任务里面还要让我配数据库

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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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