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PolarDB PostgreSQL版提供慢SQL分析功能，能够查看慢日志趋势和统计信息，并且提供SQL建议和诊断分析。

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文章 2017-05-21 来自：开发者社区

PostgreSQL 锁等待监控珍藏级SQL - 谁堵塞了谁

标签 PostgreSQL , pg_locks , pg_stat_activity , 锁监控 , 谁堵塞了谁背景在数据库中，通过锁以及多版本并发控制可以保护数据的一致性，例如A正在查询数据，B就无法对A访问的对象执行DDL。A正在更新某条记录，B就不能删除或更新这条记录。锁是数据库自动管理的，同时数据库还提供了AD LOCK或者LOCK语法，允许用户自己控制锁。例如AD...

文章 2016-03-16 来自：开发者社区

PostgreSQL 性能优化之 - 大锁与long sql/xact的蝴蝶效应

在使用数据库时，某些特定的因素结合在一起，就可能引发蝴蝶效应。导致数据库性能的急剧下降。本文要讲的是和以下几个因素有关的：因素1 PG的锁排队机制，即使没有获得锁，只要在锁队列中就会造成锁竞争。 session A lock1 get session B lock2 wait lock1 release session C lock3 可能和lock1, lock2 冲突...

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