Ora-00054 Error In Oracle
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Ora-00054 Drop Table
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 unavailable. DDL or DML operations are being run concurrently without proper commits. In most cases, Error ORA-00054? occurs from a session. Any session ora-00054 resource busy and acquire with nowait specified or timeout expired create index 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, identify the database session locking the object and kill this session. To identify the session, write the following SQL statement: 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'; To kill the session and unlock the table
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Ora-00054 Drop Index
Burleson Consulting Question: I'm trying to alter a table, and I get an ORA-00054, from what appears to be a locking problem: alter table mytab https://www.tekstream.com/resources/ora-00054-resource-busy-or-timeout-expired/ 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 the DDL unless I spend hours inconveniencing end-users by nuking their sessions. For related content, see here, details on the Oracle deadly embrace. http://www.dba-oracle.com/t_ora_00054_locks.htm 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 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 do
Social Links Printer Friendly About Search 8i | 9i | 10g | 11g | 12c | 13c | Misc | PL/SQL | https://oracle-base.com/articles/11g/ddl-lock-timeout-11gr1 SQL | 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 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 in oracle modify objects that are 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 ora-00054 error in busy error message. The default value 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 | B