PostgreSQL的參數(shù)設置級別及查詢各級別的參數(shù)值

系統(tǒng)級別

用戶/角色級別

用戶/角色 + 數(shù)據(jù)庫級別

會話級別

1.查詢某參數(shù)在系統(tǒng)級別的設置

直接到postgresql.conf中去過濾

2.查詢某參數(shù)在某用戶級別的設置

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：查詢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：查詢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.查詢某參數(shù)在某用戶下針對數(shù)據(jù)庫級別的設置

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.查詢某參數(shù)在當前會話級別的設置

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/取消這些參數(shù)的設置

ALTER ROLE name [ IN DATABASE database_name ] RESET ALL;

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