pg数据库只读怎么关掉

Posted 2023-05-08

参考技术A 硬锁定，直接将数据库切换到恢复模式，绝对不会有写操作出现、软锁定，设置default_transaction_read_only为on，默认开启的事务为只读事务。用户如果使用begiontransactionreadwrite可破解。

Pg数据库添加只读用户。

今天pg数据库需要添加一个只读用户，由于在pgAdmin4中无法添加，遂用sql添加，遇到了一个大坑，很基础的问题，只怪自己学艺不精，一次提醒自己；

注意;postgresql数据库对大小写不敏感！！！

CREATE USER test2 WITH ENCRYPTED PASSWORD ‘test2‘;
alter user test2 set default_transaction_read_only=on;
GRANT USAGE ON SCHEMA public to test2;
ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO test2;

GRANT USAGE ON SCHEMA public to test2;
GRANT SELECT ON ALL SEQUENCES IN SCHEMA public TO test2;
GRANT SELECT ON ALL TABLES IN SCHEMA public TO test2;

参考 内容；

创建用户及指定密码：

CREATE USER readonly WITH ENCRYPTED PASSWORD ‘ropass‘;
设置用户默认事务只读：

alter user readonly set default_transaction_read_only=on;
赋予用户权限，查看public模式下所有表：

GRANT USAGE ON SCHEMA public to readonly;
ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO readonly;
赋予用户连接数据库权限：

GRANT CONNECT ON DATABASE foo to readonly;
切换到指定数据库：

c foo
赋予用户表、序列查看权限：

GRANT USAGE ON SCHEMA public to readonly;
GRANT SELECT ON ALL SEQUENCES IN SCHEMA public TO readonly;
GRANT SELECT ON ALL TABLES IN SCHEMA public TO readonly;

postgresql创建只读用户
1.创建一个用户名为readonly密码为ropass的用户
CREATE USER readonly WITH ENCRYPTED PASSWORD ‘ropass‘;
 
2.用户只读事务
alter user readonly set default_transaction_read_only=on;
 
3.把所有库的语言的USAGE权限给到readonly
GRANT USAGE ON SCHEMA public to readonly;      
 
4.授予select权限(这句要进入具体数据库操作在哪个db环境执行就授予那个db的权)
 grant select on all tables in schema public to readonly;

这个是如何删除的

https://blog.csdn.net/qq_37568918/article/details/85339277?utm_medium=distribute.pc_relevant_right.none-task-blog-OPENSEARCH-3.nonecase&depth_1-utm_source=distribute.pc_relevant_right.none-task-blog-OPENSEARCH-3.nonecase

https://www.cnblogs.com/liuyanerfly/p/10731271.html

https://blog.csdn.net/dhiivgzni65686145/article/details/101870382