Category: Locks

Oracle Locks

Draft*

Query to identify the owner, object, object type, sid, serial number, status, OS user and machine to track locks:

select c.owner, c.object_name, c.object_type,b.sid, b.serial#, b.status, b.osuser, b.machine, a.session_id
 from v$locked_object a , v$session b, dba_objects c
where b.sid = a.session_id
and a.object_id = c.object_id;

More Queries:

#1
select
s1.username || '@' || s1.machine 
|| ' ( SID,S#=' || s1.sid || ',' || s1.serial# || ' ) is blocking '
|| s2.username || '@' || s2.machine
|| ' ( SID,S#=' || s2.sid || ',' || s2.serial# || ' )'
AS blocking_status
from
v$lock l1,
v$session s1,
v$lock l2,
v$session s2
where
s1.sid = l1.sid
and s2.sid = l2.sid
and l1.BLOCK = 1
and l2.request > 0
and l1.id1 = l2.id1
and l2.id2 = l2.id2;
#2
select
 oracle_username
 os_user_name,
 locked_mode,
 object_name,
 object_type
from
 v$locked_object a,dba_objects b
where
 a.object_id = b.object_id

Kill the session causing lock:

alter system kill session 'SID,SERIAL';
Eg: alter system kill session '323,1609';

Source / Reference Links: