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Managed Services Candidate Registration Technical Focus Client Opportunities Support Solutions Training Legacy to Oracle WebCenter Oracle ora 00054 fix Documents Cloud Service Next Generation AP Automation & Dynamic Discounting Oracle WebCenter Contract Lifecycle Management (CLM) Search ORA-00054: resource busy and acquire with NOWAIT specified or timeout ora-00054 drop table expiredYou 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
Ddl_lock_timeout
resource is 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 d
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drop table nowait Locks and ORA-00054 error Oracle Database Tips by Burleson Consulting ora-00054 create index Question: I'm trying to alter a table, and I get an ORA-00054, from what appears to be a locking problem: alterOracle Nowait Syntax
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 https://www.tekstream.com/resources/ora-00054-resource-busy-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 exclusive lock
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 DDL With the WAIT Option (DDL_LOCK_TIMEOUT) in Oracle Database 11g Release 1 DDL commands require exclusive locks on https://www.techonthenet.com/oracle/errors/ora00054.php 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
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