How To Resolve Ora-00054 Error
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Locks and ora-00054 resource busy and acquire with nowait specified or timeout expired create index ORA-00054 error Oracle Database Tips by Burleson Consulting Question: I'm trying to alter a table, and I get an ORA-00054, from what appears gv$access oracle to be a locking problem: 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 the DDL unless I spend hours inconveniencing end-users byHow To Unlock A Table In Oracle
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 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 upd
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