Tip

Identify an object's locks in the database

Here are two simple scripts to identify an object's locks in the database. Whenever a user complains that there's a session locked, I use these scripts to find out if there are object locks.

# To find locks objects in the database
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;

# To find locks objects for a specific session (DML Enqueue)
select l.*, o.owner object_owner, o.object_Name
  from  sys.all_objects o, v$lock l
 where l.sid = :sid  -- type a specific sid 
   and l.type = 'TM'
   and o.object_id = l.id1;

# If you need to find all sessions in the dataabse you can use my 'Who' script
select decode(sum(decode(decode(s.status,'ACTIVE',s.serial#,0),l.serial#,1,0)),0,'No','Yes') "Long",
       s.sid "Session ID",s.serial# "Serial#",s.status "Status",
       s.username "Username", RTRIM(s.osuser) "OS User",
       b.spid "OS Process ID",s.machine "Machine Name",
       s.program  "Program",c.sql_text "SQL text"
  from v$session s, v$session_longops l,v$process b,
       (select address,sql_text from v$sqltext where piece=0) c
 where (s.sid = l.sid(+)) and s.paddr=b.addr and s.sql_address = c.address
 group by s.sid,s.serial#,s.status,s.username,s.osuser,s.machine,
       s.program,b.spid, b.pid, c.sql_text 
 order by s.sid;

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This was first published in May 2002

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