Oracle Sql Error 00054

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Ora-00054 Drop Table

NOWAIT specified or timeout expired up vote 88 down vote favorite 19 Why am I getting this database error when I update a table? ERROR at line 1: ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired oracle ora-00054 share|improve this question edited Aug 6 '13 at 12:24 Josep 1472214 asked Jan 30 '11 at 11:59 sun 4641413 13 It generally helps if you oracle ddl_lock_timeout post the statement that leads to the error –Gary Myers Jan 30 '11 at 21:48 add a comment| 13 Answers 13 active oldest votes up vote 101 down vote accepted Your table is already locked by some query. Like you have executed "select for update" and has yet not committed/rollback and again fired select query. Do a commit/rollback before executing your query. share|improve this answer answered Jan 30 '11 at 12:02 user258367 1,29211013 29 I'd add 'in another session' to that. One common scenario is that you've tested the update in a tool, say SQL Developer or Toad, and have then tried to run it somewhere else while the first session still holds the lock. So you need to commit/rollback the other session before you can run the update again. –Alex Poole Jan 30 '11 at 16:36 1 Most likely DML (insert/delete/update) rather than a query. And in another session. Just because the guy who asked seems to be a newbie the answer may be correct. But you CANNOT commit in behalf of other users in a production system. If add to your answer I'll remove the downvote. –Arturo Hernandez Jul 15 '13 at 19

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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 https://www.techonthenet.com/oracle/errors/ora00054.php 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 00054 resource busy 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

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