Nowait Error In Oracle
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Ora-00054 Resource Busy And Acquire With Nowait Specified Or Timeout Expired Create Index
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 12 It generally helps if you post the statement that leads to the
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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 19:17 2 Well, what made me having that problem was in Toad: A colleag
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Question: I'm trying to alter a table, and I get an ORA-00054, from what appears to be a locking problem: oracle nowait syntax alter table mytab add newcol char * ERROR at line 1: ORA-00054: resource busy and acquire with NOWAIT specified How do I stop the ORA-00054 error? Answer: When I get an ORA-00054, it's usually impossible to do http://stackoverflow.com/questions/4842765/ora-00054-resource-busy-and-acquire-with-nowait-specified-or-timeout-expired the DDL unless I spend hours inconveniencing end-users by nuking their sessions. For related content, see here, details on the Oracle deadly embrace. Unfortunately, this is often unavoidable in a 24x7 database, especially when you are restructuring a table online with the dbms_redefinition utility. Fixing the ORA-00054 error You need to schedule the 'alter table' for when there is low activity and notify the end-users about the scheduled maintenance. Before 11g, you can http://www.dba-oracle.com/t_ora_00054_locks.htm mark the tablespace read-only for the duration of the alter table: alter tablespace tab_ts read only In 11g, you can mark the table as read-only to prevent updates during an alter table: alter table mytab read only You can verify that the table is read-only with this command: select table_name, read_onlyfrom dba_tables where owner = ?myowner? and table_name = 'MYTAB'; As an alternative to making the table read-only, you can create a temporary trigger to prevent updates: create or replace trigger tabl_read_only before insert or update or delete on mytab begin raise_application_error (-999999, 'Table mytab is undergoing maintenance. Try again later.'); end; / Details on locks and the ORA-00054 error The Oracle docs are vague on the ORA-00054 error, only suggesting that you re-try the transaction: ORA-00054: resource busy and acquire with NOWAIT specified Cause: Resource interested is busy. Action: Retry if necessary. As you see, any session that has referenced the table will require an "exclusive" lock, and always when you attempt a structural change such as adding or deleting columns. You have choices for avoiding the ORA-00054 error: Re-run the change late at night when the database is idle. Do all DDL during a maintenance window with all end-users locked-out. Kill the sessions that are preventing the exclu
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