Identify an object's locks in the database

Two simple scripts to 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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