Locks Script in ORACLE
LOCKS:
Locks are mechanisms that prevent destructive interaction between transactions accessing the same resource.
Oracle has several views for showing lock status, some of which show the username:
- DBA_BLOCKERS – Shows non-waiting sessions holding locks being waited-on
- DBA_DDL_LOCKS – Shows all DDL locks held or being requested
- DBA_DML_LOCKS - Shows all DML locks held or being requested
- DBA_LOCK_INTERNAL – Displays 1 row for every lock or latch held or being requested with the username of who is holding the lock
- DBA_LOCKS - Shows all locks or latches held or being requested
- DBA_WAITERS - Shows all sessions waiting on, but not holding waited for locks
The following script is commonly used by Oracle professionals who need to quickly find out all database objects that are locked within their system.
Most Oracle professionals use of the v$locked_object view in order to gather information about objects that are locked within the Oracle database. The v$locked_object view can also be joined into the v$session view in order to gather session level information (SID, PID, status, machine) , and also joined into the dba_objects view in order to get the owner, the object name, and the type of objects that is currently being locked within the database.
The following script can be used in order quickly identify all lock objects within your Oracle system.
select
c.owner,
c.object_name,
c.object_type,
b.sid,
b.serial#,
b.status,
b.osuser,
b.machine
from
v$locked_object a ,
v$session b,
dba_objects c
where
b.sid = a.session_id
and
a.object_id = c.object_id;
DEADLOCK:
Oracle automatically detects deadlock situations and resolves them by rolling back one of the statements involved in the deadlock. This releases one set of the conflicting row locks. A corresponding message also is returned to the transaction that undergoes the rollback.
Below the script is useful for identify – “ Who is blocking to whom ”
select s1.username || '@' || s1.machine
|| ' ( SID=' || s1.sid || ' ) is blocking '
|| s2.username || '@' || s2.machine || ' ( SID=' || s2.sid || ' ) ' AS blocking_status
from v$lock l1, v$session s1, v$lock l2, v$session s2
where s1.sid=l1.sid and s2.sid=l2.sid
and l1.BLOCK=1 and l2.request > 0
and l1.id1 = l2.id1
and l2.id2 = l2.id2 ;
below script is useful for “who’s Holder and Who’s Waiter” to query.
SELECT /*+ FIRST_ROWS ORDERED */ DECODE(request,0,'Holder: ','Waiter: ')||sid sess,
id1, id2, lmode, request, type
FROM V$LOCK
WHERE (id1, id2, type) IN
(SELECT id1, id2, type FROM V$LOCK WHERE request>0)
ORDER BY id1, request;
Below the scriprt is Useful for identify Database level locks.
select nvl(S.USERNAME,'Internal') username,
nvl(S.TERMINAL,'None') terminal,
L.SID||','||S.SERIAL# Kill, b.spid,
U1.NAME||'.'||substr(T1.NAME,1,20) tab,
decode(L.LMODE,1,'No Lock',
2,'Row Share',
3,'Row Exclusive',
4,'Share',
5,'Share Row Exclusive',
6,'Exclusive',null) lmode,
decode(L.REQUEST,1,'No Lock',
2,'Row Share',
3,'Row Exclusive',
4,'Share',
5,'Share Row Exclusive',
6,'Exclusive',null) request
from V$LOCK L,
V$SESSION S,
SYS.USER$ U1,
SYS.OBJ$ T1 ,
v$process b
where L.SID = S.SID
and T1.OBJ# = decode(L.ID2,0,L.ID1,L.ID2)
and U1.USER# = T1.OWNER#
and S.TYPE != 'BACKGROUND'
and s.paddr = b.addr order by 1,2,5 ;
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