ORA-04021 Issues

Question

Hi,
While trying to compile a package i am receiving an error
CREATE OR REPLACE Package BODY Etl AS
ERROR at line 1:
ORA-04021: timeout occurred while waiting to lock object
OWNER.ETL
But when i am compliling the package with a different name its getting compiled successfully.
Why its behaving in such a fashion?
Kindly answer?
Thanks in advance.

Answer 1

Hi Sid,
The below query will help you check if your resource is being locked
SELECT /*+ ordered */
     --b.kaddr,
     c.sid,
     lock_waiter.waiting_session,
     lock_blocker.holding_session,
     c.program,
     c.osuser,
     c.machine,
     c.process,
     DECODE(u.name,
          NULL,'',
          u.name||'.'||o.name
     ) OBJECT,
     c.username,
     DECODE
          b.TYPE,
          'BL', 'Buffer hash table instance lock',
          'CF', 'Control file schema global enqueue lock',
          'CI', 'Cross-instance function invocation instance lock',
          'CU', 'Cursor bind lock',
          'DF', 'Data file instance lock',
          'DL', 'direct loader parallel index create lock',
          'DM', 'Mount/startup db primary/secondary instance lock',
          'DR', 'Distributed recovery process lock',
          'DX', 'Distributed transaction entry lock',
          'FS', 'File set lock',
          'IN', 'Instance number lock',
          'IR', 'Instance recovery serialization global enqueue lock',
          'IS', 'Instance state lock',
          'IV', 'Library cache invalidation instance lock',
          'JQ', 'Job queue lock',
          'KK', 'Thread kick lock',
          'LA','Library cache lock instance lock (A..P=namespace);',
          'LB','Library cache lock instance lock (A..P=namespace);',
          'LC','Library cache lock instance lock (A..P=namespace);',
          'LD','Library cache lock instance lock (A..P=namespace);',
          'LE','Library cache lock instance lock (A..P=namespace);',
          'LF','Library cache lock instance lock (A..P=namespace);',
          'LG','Library cache lock instance lock (A..P=namespace);',
          'LH','Library cache lock instance lock (A..P=namespace);',
          'LI','Library cache lock instance lock (A..P=namespace);',
          'LJ','Library cache lock instance lock (A..P=namespace);',
          'LK','Library cache lock instance lock (A..P=namespace);',
          'LL','Library cache lock instance lock (A..P=namespace);',
          'LM','Library cache lock instance lock (A..P=namespace);',
          'LN','Library cache lock instance lock (A..P=namespace);',
          'LO','Library cache lock instance lock (A..P=namespace);',
          'LP','Library cache lock instance lock (A..P=namespace);',
          'MM', 'Mount definition global enqueue lock',
          'MR', 'Media recovery lock',
          'NA', 'Library cache pin instance lock (A..Z=namespace)',
          'NB', 'Library cache pin instance lock (A..Z=namespace)',
          'NC', 'Library cache pin instance lock (A..Z=namespace)',
          'ND', 'Library cache pin instance lock (A..Z=namespace)',
          'NE', 'Library cache pin instance lock (A..Z=namespace)',
          'NF', 'Library cache pin instance lock (A..Z=namespace)',
          'NG', 'Library cache pin instance lock (A..Z=namespace)',
          'NH', 'Library cache pin instance lock (A..Z=namespace)',
          'NI', 'Library cache pin instance lock (A..Z=namespace)',
          'NJ', 'Library cache pin instance lock (A..Z=namespace)',
          'NK', 'Library cache pin instance lock (A..Z=namespace)',
          'NL', 'Library cache pin instance lock (A..Z=namespace)',
          'NM', 'Library cache pin instance lock (A..Z=namespace)',
          'NN', 'Library cache pin instance lock (A..Z=namespace)',
          'NO', 'Library cache pin instance lock (A..Z=namespace)',
          'NP', 'Library cache pin instance lock (A..Z=namespace)',
          'NQ', 'Library cache pin instance lock (A..Z=namespace)',
          'NR', 'Library cache pin instance lock (A..Z=namespace)',
          'NS', 'Library cache pin instance lock (A..Z=namespace)',
          'NT', 'Library cache pin instance lock (A..Z=namespace)',
          'NU', 'Library cache pin instance lock (A..Z=namespace)',
          'NV', 'Library cache pin instance lock (A..Z=namespace)',
          'NW', 'Library cache pin instance lock (A..Z=namespace)',
          'NX', 'Library cache pin instance lock (A..Z=namespace)',
          'NY', 'Library cache pin instance lock (A..Z=namespace)',
          'NZ', 'Library cache pin instance lock (A..Z=namespace)',
          'PF', 'Password File lock',
          'PI', 'Parallel operation locks',
          'PS', 'Parallel operation locks',
          'PR', 'Process startup lock',
          'QA','Row cache instance lock (A..Z=cache)',
          'QB','Row cache instance lock (A..Z=cache)',
          'QC','Row cache instance lock (A..Z=cache)',
          'QD','Row cache instance lock (A..Z=cache)',
          'QE','Row cache instance lock (A..Z=cache)',
          'QF','Row cache instance lock (A..Z=cache)',
          'QG','Row cache instance lock (A..Z=cache)',
          'QH','Row cache instance lock (A..Z=cache)',
          'QI','Row cache instance lock (A..Z=cache)',
          'QJ','Row cache instance lock (A..Z=cache)',
          'QK','Row cache instance lock (A..Z=cache)',
          'QL','Row cache instance lock (A..Z=cache)',
          'QM','Row cache instance lock (A..Z=cache)',
          'QN','Row cache instance lock (A..Z=cache)',
          'QP','Row cache instance lock (A..Z=cache)',
          'QQ','Row cache instance lock (A..Z=cache)',
          'QR','Row cache instance lock (A..Z=cache)',
          'QS','Row cache instance lock (A..Z=cache)',
          'QT','Row cache instance lock (A..Z=cache)',
          'QU','Row cache instance lock (A..Z=cache)',
          'QV','Row cache instance lock (A..Z=cache)',
          'QW','Row cache instance lock (A..Z=cache)',
          'QX','Row cache instance lock (A..Z=cache)',
          'QY','Row cache instance lock (A..Z=cache)',
          'QZ','Row cache instance lock (A..Z=cache)',
          'RT', 'Redo thread global enqueue lock',
          'SC', 'System commit number instance lock',
          'SM', 'SMON lock',
          'SN', 'Sequence number instance lock',
          'SQ', 'Sequence number enqueue lock',
          'SS', 'Sort segment locks',
          'ST', 'Space transaction enqueue lock',
          'SV', 'Sequence number value lock',
          'TA', 'Generic enqueue lock',
          'TS', 'Temporary segment enqueue lock (ID2=0)',
          'TS', 'New block allocation enqueue lock (ID2=1)',
          'TT', 'Temporary table enqueue lock',
          'UN', 'User name lock',
          'US', 'Undo segment DDL lock',
          'WL', 'Being-written redo log instance lock',
          b.TYPE
     ) lock_type,
     DECODE
          b.lmode,
          0, 'None', /* Mon Lock equivalent */
          1, 'Null', /* N */
          2, 'Row-S (SS)', /* L */
          3, 'Row-X (SX)', /* R */
          4, 'Share', /* S */
          5, 'S/Row-X (SRX)', /* C */
          6, 'Exclusive', /* X */
          TO_CHAR(b.lmode)
     ) mode_held,
     DECODE
          b.request,
          0, 'None', /* Mon Lock equivalent */
          1, 'Null', /* N */
          2, 'Row-S (SS)', /* L */
          3, 'Row-X (SX)', /* R */
          4, 'Share', /* S */
          5, 'S/Row-X (SSX)', /* C */
          6, 'Exclusive', /* X */
          TO_CHAR(b.request)
     ) mode_requested
FROM
     v$lock b
     ,v$session c
     ,sys.USER$ u
     ,sys.obj$ o
     ,( SELECT * FROM sys.dba_waiters) lock_blocker
     ,( SELECT * FROM sys.dba_waiters) lock_waiter
WHERE
b.sid = c.sid
AND u.USER# = c.USER#
AND o.obj#(+) = b.id1
AND lock_blocker.waiting_session(+) = c.sid
AND lock_waiter.holding_session(+) = c.sid
AND c.username != 'SYS'
ORDER BY kaddr, lockwait
The query is from the following site http://www.orafaq.com/scripts/performance/lockall.txt
Unless, the object you are trying to create/replace is being locked by another database object, i dont see how you ll get this error... are you using read write / file access or any such code? can you share your code? it may be accessing a resource that is locked..
Do let me know if this helps