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Re: backend hangs at sendto() and can't be terminated

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You can do select pg_cancel_backend(8243);

and that should terminate that process that is sending, but still leave your postgres server healthy.

regards,
Bill

On 7/8/13 5:31 AM, Jov wrote:
one of our pg user send a select * from 10 million table without limit from psql,before get the return data,he realize the mistake and quite from psql.but after 2 hours,the sql still alive:

postgres=# SELECT * from pg_stat_activity where procpid = 8243;
-[ RECORD 1 ]----+---------------------------------
datid            | 758972
datname          | xxx
procpid          | 8243
usesysid         | 661846
usename          | test
application_name | psql
client_addr      | 10.136.4.90
client_hostname  | 
client_port      | 6382
backend_start    | 2013-07-08 14:11:00.942293+08
xact_start       | 2013-07-08 14:31:11.157681+08
query_start      | 2013-07-08 14:31:11.157681+08
waiting          | f
current_query    | select * from yyyy;

pg_terminate_backend return t but the backend still there.

strace the pid show the process hang at sendto() function call:
[postgres@xxx ~]$ strace -tv -p 8243
Process 8243 attached - interrupt to quit
17:02:26 sendto(10, "70804\0\0\0\f{2012070804}D\0\0\0`\0\5\0\0\0\1"..., 8152, 0, NULL, 0^C <unfinished ...>
Process 8243 detached

os is centos 6 x86-64,pg version is 9.1.9.

the process still there,how can I help to debug the problem?




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