pg主从备份和主从切换
https://blog.csdn.net/m0_52544877/article/details/125449202
https://help.aliyun.com/zh/ecs/use-cases/build-a-primary-or-secondary-postgresql-architecture
https://blog.csdn.net/m0_52544877/article/details/125449202
https://help.aliyun.com/zh/ecs/use-cases/build-a-primary-or-secondary-postgresql-architecture