[gpadmin@wx60 ~]$ psql gtlions
psql (8.2.15)
Type "help" for help.
gtlions=# select version();
version
------------------------------------------------------------------------------------------------------------------------------------------------------
PostgreSQL 8.2.15 (Greenplum Database 4.2.7.2 build 1) on x86_64-unknown-linux-gnu, compiled by GCC gcc (GCC) 4.4.2 compiled on Feb 25 2014 18:05:04
(1 row)
gtlions=# \du
List of roles
Role name | Attributes | Member of
-----------+-----------------------------------+-----------
gpadmin | Superuser, Create role, Create DB |
gtlions=# \dn
List of schemas
Name | Owner
--------------------+---------
gp_toolkit | gpadmin
information_schema | gpadmin
pg_aoseg | gpadmin
pg_bitmapindex | gpadmin
pg_catalog | gpadmin
pg_toast | gpadmin
public | gpadmin
(7 rows)
gtlions=# create user t1 ;
NOTICE: resource queue required -- using default resource queue "pg_default"
CREATE ROLE
gtlions=# create user t2;
NOTICE: resource queue required -- using default resource queue "pg_default"
CREATE ROLE
gtlions=# \c gtlions t1
You are now connected to database "gtlions" as user "t1".[gpadmin@wx60 ~]$ psql -U t2 gtlions psql (8.2.15) Type "help" for help. gtlions=> select * from pg_stat_activity ; datid | datname | procpid | sess_id | usesysid | usename | current_query | waiting | query_start | backend_start | client_addr | client_port | application_name | xact_start -------+---------+---------+---------+----------+---------+----------------------------------+---------+-------------------------------+------------------------------- +-------------+-------------+------------------+------------------------------- 16992 | gtlions | 3395 | 13 | 25881 | t2 | select * from pg_stat_activity ; | f | 2014-10-11 09:25:56.197394+08 | 2014-10-11 09:25:43.293684+08 | | -1 | psql | 2014-10-11 09:25:56.197394+08 16992 | gtlions | 3384 | 12 | 25880 | t1 | <insufficient privilege> | | | | | | psql | (2 rows) gtlions=> select pg_cancel_backend(3384); ERROR: must be superuser to signal other server processes gtlions=>
create or replace function session_mgr(procpid integer, opertype character) returns boolean as $BODY$ declare ret boolean; begin if opertype = ‘c‘ then ret := (select pg_catalog.pg_cancel_backend(procpid)); elsif opertype = ‘k‘ then ret := (select pg_catalog.pg_terminate_backend(procpid)); end if; return ret; end; $BODY$ LANGUAGE plpgsql security definer; gtlions=# grant execute on function session_mgr(integer, character) to t2; GRANT gtlions=# \c gtlions t1 You are now connected to database "gtlions" as user "t1". gtlions=>
[gpadmin@wx60 ~]$ psql -U t2 gtlions psql (8.2.15) Type "help" for help. gtlions=> select * from pg_stat_activity ; datid | datname | procpid | sess_id | usesysid | usename | current_query | waiting | query_start | backend_start | client_addr | client_port | application_name | xact_start -------+---------+---------+---------+----------+---------+----------------------------------+---------+-------------------------------+------------------------------- +-------------+-------------+----------------------------+------------------------------- 16992 | gtlions | 4034 | 19 | 25881 | t2 | select * from pg_stat_activity ; | f | 2014-10-11 09:48:53.767859+08 | 2014-10-11 09:48:51.285594+08 | | -1 | psql | 2014-10-11 09:48:53.767859+08 16992 | gtlions | 3678 | 15 | 10 | gpadmin | <insufficient privilege> | | | | | | pgAdmin III - ??????
??? | 16992 | gtlions | 3704 | 16 | 10 | gpadmin | <insufficient privilege> | | | | | | pgAdmin III - ?
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?? | 16992 | gtlions | 4023 | 18 | 25880 | t1 | <insufficient privilege> | | | | | | psql | (4 rows) gtlions=> select session_mgr(4023,‘c‘); session_mgr ------------- t (1 row) gtlions=> select * from pg_stat_activity ; datid | datname | procpid | sess_id | usesysid | usename | current_query | waiting | query_start | backend_start | client_addr | client_port | application_name | xact_start -------+---------+---------+---------+----------+---------+----------------------------------+---------+-------------------------------+------------------------------- +-------------+-------------+----------------------------+------------------------------- 16992 | gtlions | 4034 | 19 | 25881 | t2 | select * from pg_stat_activity ; | f | 2014-10-11 09:52:03.279186+08 | 2014-10-11 09:48:51.285594+08 | | -1 | psql | 2014-10-11 09:52:03.279186+08 16992 | gtlions | 4065 | 20 | 10 | gpadmin | <insufficient privilege> | | | | | | pgAdmin III - ?
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| 16992 | gtlions | 3678 | 15 | 10 | gpadmin | <insufficient privilege> | | | | | | pgAdmin III - ??????
??? | 16992 | gtlions | 3704 | 16 | 10 | gpadmin | <insufficient privilege> | | | | | | pgAdmin III - ???
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| 16992 | gtlions | 4023 | 18 | 25880 | t1 | <insufficient privilege> | | | | | | psql | (5 rows) gtlions=> select session_mgr(4023,‘k‘); session_mgr ------------- t (1 row) gtlions=> select * from pg_stat_activity ; datid | datname | procpid | sess_id | usesysid | usename | current_query | waiting | query_start | backend_start | client_addr | client_port | application_name | xact_start -------+---------+---------+---------+----------+---------+----------------------------------+---------+-------------------------------+------------------------------- +-------------+-------------+----------------------------+------------------------------- 16992 | gtlions | 4034 | 19 | 25881 | t2 | select * from pg_stat_activity ; | f | 2014-10-11 09:52:28.473137+08 | 2014-10-11 09:48:51.285594+08 | | -1 | psql | 2014-10-11 09:52:28.473137+08 16992 | gtlions | 4065 | 20 | 10 | gpadmin | <insufficient privilege> | | | | | | pgAdmin III - ?
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| 16992 | gtlions | 3678 | 15 | 10 | gpadmin | <insufficient privilege> | | | | | | pgAdmin III - ?
?
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???
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? | 16992 | gtlions | 3704 | 16 | 10 | gpadmin | <insufficient privilege> | | | | | | pgAdmin III - ?
???????????
| 16992 | gtlions | 4189 | 21 | 25880 | t1 | <insufficient privilege> | | | | | | psql | (5 rows) gtlions=>
gtlions=> select version();
FATAL: terminating connection due to administrator command
server closed the connection unexpectedly
This probably means the server terminated abnormally
before or while processing the request.
The connection to the server was lost. Attempting reset: Succeeded.原文：http://www.cnblogs.com/yutingliuyl/p/6718211.html