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are here: Home / Resources / ORA-00054: resource busy and acquire with NOWAIT specified or timeout ... ORA-00054 Error Message Error ORA-00054 is a commonly seen error by Oracle users and occurs when a user tries to execute a LOCK TABLE or SELECT FOR UPDATE command with the NOWAIT keyword when the resource is ddl_lock_timeout unavailable. DDL or DML operations are being run concurrently without proper commits. In most cases, Error ORA-00054? occurs from a session. Any session that has referenced the table and any structural change attempt, such as adding a column, requires an “exclusive" lock. There are several options for tables or views to see locks and specific information about the locks: 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/latch held or being requested with the username of who is holding lock DBA_LOCKS: Shows all locks/latches held or being requested DBA_WAITERS: Shows all sessions waiting on but not holding waited for locks The first step the user should take in fixing this error is to wait a few minutes, then try the command again. This simple step may solve the problem. If this does not work, identi

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Social Links Printer Friendly About Search 8i | 9i | 10g | 11g | 12c | 13c | Misc | PL/SQL | SQL | https://oracle-base.com/articles/11g/ddl-lock-timeout-11gr1 RAC | WebLogic | Linux Home » Articles » 11g » Here http://nimishgarg.blogspot.com/2012/05/ora-00054-resource-busy-and-acquire.html DDL With the WAIT Option (DDL_LOCK_TIMEOUT) in Oracle Database 11g Release 1 DDL commands require exclusive locks on internal structures. If these locks are not available the commands return with an "ORA-00054: resource busy" error message. This can be especially frustrating when trying to modify objects that are ora 00054 accessed frequently. To get round this Oracle 11g includes the DDL_LOCK_TIMEOUT parameter, which can be set at instance or session level using the ALTER SYSTEM and ALTER SESSION commands respectively. The DDL_LOCK_TIMEOUT parameter indicates the number of seconds a DDL command should wait for the locks to become available before throwing the resource busy error message. The default value resource busy and is zero. To see it in action, create a new table and insert a row, but don't commit the insert. CREATE TABLE lock_tab ( id NUMBER ); INSERT INTO lock_tab VALUES (1); Leave this session alone and in a new session, set the DDL_LOCK_TIMEOUT at session level to a non-zero value and attempt to add a column to the table. ALTER SESSION SET ddl_lock_timeout=30; ALTER TABLE lock_tab ADD ( description VARCHAR2(50) ); The session will wait for 30 seconds before failing. ALTER TABLE lock_tab ADD ( * ERROR at line 1: ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired If we repeat the ALTER TABLE command and commit the insert in the first session within 30 seconds, the ALTER TABLE will return a successful message. ALTER TABLE lock_tab ADD ( description VARCHAR2(50) ); Table altered. SQL> For more information see: DDL_LOCK_TIMEOUT Hope this helps. Regards Tim... Back to the Top. 2 comments, read/add them... Home | Articles | Scripts | Blog | Certification | Misc | About About Tim Hall Copyright & Disclaimer

unavailable for a LOCK TABLE or SELECT FOR UPDATE command. Action: Try the command after a few minutes or enter the command without the NOWAIT keyword. Reference: http://docs.oracle.com/cd/B19306_01/server.102/b14219/e0.htm Example: SQL> alter table emp add (mobile varchar2(15)); * ERROR at line 1: ORA-00054: resource busy and acquire with NOWAIT specified How to avoid the ORA-00054: - Execute DDL at off-peak hours, when database is idle. - Execute DDL in maintenance window. - Find and Kill the session that is preventing the exclusive lock. Other Solutions: Solution 1: In Oracle 11g you can set ddl_lock_timeout i.e. allow DDL to wait for the object to become available, simply specify how long you would like it to wait: SQL> alter session set ddl_lock_timeout = 600; Session altered. SQL> alter table emp add (mobile varchar2(15)); Table altered. Solution 2: Also In 11g, you can mark your table as read-only to prevent DML: SQL> alter table emp read only; Session altered. SQL> alter table emp add (mobile varchar2(15)); Table altered. Solution 3 (for 10g): DECLARE MYSQL VARCHAR2(250) := 'alter table emp add (mobile varchar2(15))'; IN_USE_EXCEPTION EXCEPTION; PRAGMA EXCEPTION_INIT(IN_USE_EXCEPTION, -54); BEGIN WHILE TRUE LOOP BEGIN EXECUTE IMMEDIATE MYSQL; EXIT; EXCEPTION WHEN IN_USE_EXCEPTION THEN NULL; END; DBMS_LOCK.SLEEP(1); END LOOP; END; Solution 4: Step 1: Identify the session which is locking the object select a.sid, a.serial# from v$session a, v$locked_object b, dba_objects c where b.object_id = c.object_id and a.sid = b.session_id and OBJECT_NAME='EMP'; Step 2: kill that session using alter system kill session 'sid,serial#';Related Posts: - ORA-00027 cannot kill current session - Stopping Query without killing the session - ORA-01031: insufficient privileges Email ThisBlogThis!Share to TwitterShare to FacebookShare to Pinterest Labels: Ora-Codes 34 comments: JamirJrOctober 25, 2012 at 6:16 PMvery, very thanksSolution 4.... OK!ReplyDeletehamada066February 18, 2013 at 4:42 PMthanks a lot . i face the same problem and solution 4 is the perfect one ReplyDeleteRepliesNimish GargFebruary 18, 2013 at 4:59 PMnice to know that i was able to solve your porb :)DeleteReplyPaulineFebruary 20, 2013 at 7:39 AMThanks a lot, I used solution 3ReplyDeleteMohammad Hamid NaseerMarch 19, 2013 at 12:32 AMThanks a lot.