Ora 00054 Error Nowait Specified
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ora 00054 fix Locks and ORA-00054 error Oracle Database Tips by Burleson Consulting ora-00054 drop table 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 add newcolOra-00054 Create Index
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. Unfortunately, this is ddl_lock_timeout 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 docs are vague on the ORA-00054 err
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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 http://www.dba-oracle.com/t_ora_00054_locks.htm 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 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 https://www.tekstream.com/resources/ora-00054-resource-busy-or-timeout-expired/ 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 tables, write the following statement: SQL>alter system kill session ‘sid, serial#’; Another option to fix this error in Oracle 11g is to make your table read-only to prevent DML. Take the following SQL statement example: SQL> alter table emp add (cust_id varchar2(3)); To alter the session table, execute the following: SQL>alter table emp read only; SQL> alter
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