May 17, 2026, 11:40 PM

inbox/DataBase/PostgreSQL/user_managemet/alter_user.sql

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+-- Rename a user:
+
+postgres=# alter user dbatest rename to dbaprod;
+NOTICE: MD5 password cleared because of role rename
+ALTER ROLE
+postgres=# \du
+List of roles
+Role name  | Attributes                                                 | Member of
+-----------+------------------------------------------------------------+-----------
+dbaprod   |                                                             | {}
+postgres  | Superuser, Create role, Create DB, Replication, Bypass RLS  | {}
+
+<< NOTE - AFTER renaming the user, you need to reset the password to same old one.
+
+i.e
+-- Change the password a user:
+
+postgres=# alter user dbaprod password 'test';
+ALTER ROLE
+
+--- Increase the validity of the user:
+
+postgres=# alter user dbaprod valid until 'Feb 10 2021';
+ALTER ROLE

inbox/DataBase/PostgreSQL/user_managemet/find_path.sql

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+-- Find search_path of users in a particular database ( replace your db_name(EDB))
+
+SELECT r.rolname, d.datname, drs.setconfig
+FROM pg_db_role_setting drs
+LEFT JOIN pg_roles r ON r.oid = drs.setrole
+LEFT JOIN pg_database d ON d.oid = drs.setdatabase
+WHERE d.datname = 'EDB';
+
+-- Find search_path of users in postgres db cluster( all database)
+
+SELECT r.rolname, d.datname, drs.setconfig
+FROM pg_db_role_setting drs
+LEFT JOIN pg_roles r ON r.oid = drs.setrole
+LEFT JOIN pg_database d ON d.oid = drs.setdatabase;
+
+
+-- set search_path for a user in particular db:
+
+postgres# alter user prod_user in database "EDB" set search_path="$user", public, prim_db;
+
+-- set search_path for a user in postgres cluster( all dbs)
+
+postgres=# alter user prod_user set search_path="$user", public, prim_db;

inbox/DataBase/PostgreSQL/user_managemet/list_roles.sql

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+List roles :
+
+postgres=# select rolname,rolcanlogin,rolvaliduntil from pg_roles;
+rolname               | rolcanlogin | rolvaliduntil
+----------------------+-------------+---------------------------
+pg_monitor            | f           |
+pg_read_all_settings  | f           |
+pg_read_all_stats     | f           |
+pg_stat_scan_tables   | f           |
+pg_signal_backend     | f           |
+postgres              | t           |
+test_dbuser1          | f           | 2020-08-08 00:00:00+05:30
+
+ 
+
+rolcanlogin - > If true mean they are role as well as user
+                If false mean they are only role( they cannot login)
+
+NOTE - > In postgres users are bydefault role, but roles are not bydefault user. i.e
+
+Bydefault user come with login privilege, where as roles don’t come with login privilege.

inbox/DataBase/PostgreSQL/user_managemet/list_users.sql

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+--- List users present in postgres:
+
+postgres=# select usename,usesuper,valuntil from pg_user;
+usename         | usesuper   | valuntil
+---------------+----------+---------------------------
+postgres       | t           |
+test_dbuser1   | f            | 2020-08-08 00:00:00+05:30
+
+postgres#select usename,usesuper,valuntil from pg_shadow;
+
+usename         | usesuper   | valuntil
+---------------+----------+---------------------------
+postgres       | t           |
+test_dbuser1   | f            | 2020-08-08 00:00:00+05:30
+
+postgres#select usename,usesuper,valuntil from pg_shadow;
+
+postgres=# \du
+List of roles
+Role name      | Attributes                                                 | Member of
+---------------+------------------------------------------------------------+-----------
+postgres       | Superuser, Create role, Create DB, Replication, Bypass RLS | {}
+test_dbuser1   | Password valid until 2020-08-08 00:00:00+05:30             | {}
+
+ 
+
+NOTE - > \du command output includes both user and roles(custom created roles only).
+
+postgres users are bydefault role, but roles are not bydefault user.

inbox/DataBase/PostgreSQL/user_managemet/profile.sql

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+--- in edb postgres advanced server we can create user profile
+---- similar to that of oracle.
+
+-- Create profile:
+
+# create profile REPORTING_PROFILE limit FAILED_LOGIN_ATTEMPTS 3 PASSWORD_LIFE_TIME 90;
+
+--- Alter profile:
+
+# alter profile REPORTING_PROFILE limit FAILED_LOGIN_ATTEMPTS 1;
+
+-- view profile details:
+
+# select * from dba_profiles;

inbox/DataBase/PostgreSQL/user_managemet/role.sql

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+- Create role :
+
+dbaclass=# create role dev_admin;
+CREATE ROLE
+
+dbaclass=# create role dev_admin with valid until '10-oct-2020';
+CREATE ROLE
+
+-- role with createdb and superuser privilege and login keyword mean it can login to db like a normal user
+
+dbaclass=# create role dev_admin with createdb createrole login ;
+CREATE ROLE
+
+DROP ROLE:
+
+dbaclass=# drop role dev_admin;
+DROP ROLE
+
+select rolname,rolcanlogin,rolvaliduntil from pg_roles;

inbox/DataBase/PostgreSQL/user_managemet/schema.sql

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+• A schema is a named collection of tables. A schema can also contain views, indexes, sequences, data types, operators, and functions.
+
+--- Create schema:
+
+postgres=# create schema dba_schema;
+CREATE SCHEMA
+
+-- Create schema with authorize particular user:
+
+postgres=# create schema dba_schema authorization raj2;
+CREATE SCHEMA
+
+-- Drop schema
+
+postgres=# drop schema dba_schema;
+DROP SCHEMA
+
+-- List down schemas present
+
+postgres=# \dn+
+List of schemas
+Name        | Owner.   | Access privileges    | Description
+------------+----------+----------------------+------------------------
+dba_schema | raj2      |                      |
+public     | postgres  | postgres=UC/postgres+| standard public schema| | =UC/postgres |
+raj.       | postgres | |
+(3 rows)

inbox/DataBase/PostgreSQL/user_managemet/user.sql

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+CREATE USER:
+
+dbaclass=# create user TEST_DBACLASS with password 'test123';
+CREATE ROLE
+
+CREATE USER WITH VALID UNTIL:
+
+dbaclass=# create user TEST_dbuser1 with password 'test123' valid until '2020-08-08';
+CREATE ROLE
+
+CREATE USER WITH SUPER USER PRIVILEGE
+
+dbaclass=# create user test_dbuser3 with password 'test123' CREATEDB SUPERUSER;
+
+CREATE ROLE
+
+VIEW USERS:
+
+dbaclass=# select usename,valuntil,usecreatedb from pg_shadow;
+
+dbaclass=# select usename,usesuper,valuntil from pg_user;
+
+dbaclass=# \du+
+
+DROP USER:
+
+drop user DB_user1;
+
+
+-- providing superuser role will make an user superuser.
+
+postgres=# select usename,usesuper from pg_user where usename='dbatest';
+usename  | usesuper
+---------+----------
+dbatest  | f
+(1 row)
+
+postgres=#
+postgres=# alter user dbatest with superuser;
+ALTER ROLE
+postgres=# select usename,usesuper from pg_user where usename='dbatest';
+usename  | usesuper
+---------+----------
+dbatest  | t
+
+-- How to revoke superuser:
+
+postgres=# alter user dbatest with nosuperuser;
+ALTER ROLE
+postgres=#
+postgres=# select usename,usesuper from pg_user where usename='dbatest';
+usename  | usesuper
+---------+----------
+dbatest  | f
+(1 row)
+
+
+-- providing superuser role will make an user superuser.
+
+postgres=# select usename,usesuper from pg_user where usename='dbatest';
+usename  | usesuper
+---------+----------
+dbatest  | f
+(1 row)
+
+postgres=#
+postgres=# alter user dbatest with superuser;
+ALTER ROLE
+postgres=# select usename,usesuper from pg_user where usename='dbatest';
+usename  | usesuper
+---------+----------
+dbatest  | t
+
+-- How to revoke superuser:
+
+postgres=# alter user dbatest with nosuperuser;
+ALTER ROLE
+postgres=#
+postgres=# select usename,usesuper from pg_user where usename='dbatest';
+usename  | usesuper
+---------+----------
+dbatest  | f
+(1 row)