PostgreSQL的参数设置级别及查询各级别的参数值

系统级别

用户/角色级别

用户/角色 + 数据库级别

会话级别

1.查询某参数在系统级别的设置

直接到postgresql.conf中去过滤

2.查询某参数在某用户级别的设置

testdb=# create user testa password 'testa';

CREATE ROLE

Time: 85.415 ms

testdb=# alter role testa set log_min_duration_statement = 100;

ALTER ROLE

Time: 12.714 ms

--方法一：查询pg_user表

testdb=# select * from pg_user where usename='testa';

usename | usesysid | usecreatedb | usesuper | usecatupd | userepl |  passwd  | valuntil |            useconfig

---------+----------+-------------+----------+-----------+---------+----------+----------+----------------------------------

testa   |    25697 | f           | f        | f         | f       | ******** |          | {log_min_duration_statement=100}

(1 row)

Time: 1.003 ms

--方法二：查询pg_db_role_setting表

testdb=# select * from pg_db_role_setting

testdb-# where setrole in (select usesysid from pg_user where usename in ('testa'))

testdb-# order by setrole,setdatabase;

setdatabase | setrole |            setconfig

-------------+---------+----------------------------------

0 |   25697 | {log_min_duration_statement=100}

(1 rows)

Time: 1.132 ms

3.查询某参数在某用户下针对数据库级别的设置

testdb=# alter role testa in database testdb set client_min_messages='warning';

ALTER ROLE

Time: 2.111 ms

testdb=# select * from pg_db_role_setting

testdb-# where setrole in (select usesysid from pg_user where usename in ('testa'))

testdb-# order by setrole,setdatabase;

setdatabase | setrole |            setconfig

-------------+---------+----------------------------------

0 |   25697 | {log_min_duration_statement=100}

16412 |   25697 | {client_min_messages=warning}

(2 rows)

Time: 1.132 ms

4.查询某参数在当前会话级别的设置

testdb=> \c testdb testa

You are now connected to database "testdb" as user "testa".

testdb=>

testdb=> select user;

current_user

--------------

testa

(1 row)

testdb=> show client_min_messages;

client_min_messages

---------------------

warning

(1 row)

testdb=> set client_min_messages='error';

SET

testdb=> show client_min_messages;

client_min_messages

---------------------

error

(1 row)

重置/取消这些参数的设置

ALTER ROLE name [ IN DATABASE database_name ] RESET ALL;

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