Re: Query is stuck

["Plugge, Joe R." <JRPlugge@xxxxxxxx>]

What version of postgres are you on?

 

From: Satish Burnwal (sburnwal) [mailto:sburnwal@xxxxxxxxx]
Sent: Tuesday, April 13, 2010 8:04 AM
To: Plugge, Joe R.; pgsql-general@xxxxxxxxxxxxxx
Cc: pgsql-admin@xxxxxxxxxxxxxx
Subject: RE: Query is stuck

 

controlsmartdb=# select * from pg_stat_activity where waiting='t';

ERROR:  column "waiting" does not exist

 

From: Plugge, Joe R. [mailto:JRPlugge@xxxxxxxx]
Sent: Tuesday, April 13, 2010 6:32 PM
To: Satish Burnwal (sburnwal); pgsql-general@xxxxxxxxxxxxxx
Cc: pgsql-admin@xxxxxxxxxxxxxx
Subject: RE: Query is stuck

 

What do you get when you run this?

 

select * from pg_stat_activity where waiting='t';

 

 

 

From: pgsql-admin-owner@xxxxxxxxxxxxxx [mailto:pgsql-admin-owner@xxxxxxxxxxxxxx] On Behalf Of Satish Burnwal (sburnwal)
Sent: Tuesday, April 13, 2010 7:58 AM
To: pgsql-general@xxxxxxxxxxxxxx
Cc: pgsql-admin@xxxxxxxxxxxxxx
Subject: [ADMIN] Query is stuck

 

I have a query which is not giving me the result even after 30 minutes. I want to know how to detect what is going and what’s wrong ?

 

EXPLAIN query - gives me the following:

controlsmartdb=# explain select report_id, dm_ip, dm_mac, dm_user, dm_os, report_time, sys_name,  sys_user, sys_user_domain, ss_key, login_time, role_id, new_vlan_id from repcopy as a where report_time = (select max(report_time) from repcopy as b where a.dm_ip = b.dm_ip and a.dm_user=b.dm_user and b.ss_key != '') and report_status = 0 and dm_user = 'u1';

                                                         QUERY PLAN

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

 Seq Scan on repcopy a  (cost=0.00..1630178118.35 rows=35 width=133)

   Filter: ((report_status = 0) AND ((dm_user)::text = 'u1'::text) AND (report_time = (subplan)))

   SubPlan

     ->  Aggregate  (cost=8151.65..8151.66 rows=1 width=8)

           ->  Seq Scan on repcopy b  (cost=0.00..8151.65 rows=1 width=8)

                 Filter: ((($0)::text = (dm_ip)::text) AND (($1)::text = (dm_user)::text) AND ((ss_key)::text <> ''::text))

(6 rows)

 

But EXPLAIN ANALYSE query hangs (is not giving me any output even after 30 minutes).

 

Pg_stat_activity shows this - SELECT procpid, usename, current_query, query_start from pg_stat_activity:

2942 | postgres | select report_id, dm_ip, dm_mac, dm_user, dm_os, report_time, sys_name,  sys_user, sys_user_domain, ss_key, login_time, role_id, new_vlan_id from repcopy as a where report_time = (select max(report_time) from repcopy as b where a.dm_ip = b.dm_ip and a.dm_user=b.dm_user and b.ss_key != '') and report_status = 0 and dm_user = 'u1'; | 2010-04-13 18:20:02.828623+05:30

 

 

In such a case what can I do ?