If you are encountering the ORA-02074 error in Oracle, it means that you have attempted to specify the ONLINE or OFFLINE option for a tablespace or datafile that is already in the specified state. This error can occur when attempting to bring a tablespace or datafile online or offline using the ALTER TABLESPACE or ALTER DATAFILE command.
Diagnosing the ORA-02074 Error
When diagnosing the ORA-02074 error, it’s important to first identify which tablespace or datafile is causing the issue. You can do this by querying the DBA_TABLESPACES and DBA_DATA_FILES views in Oracle.
SELECT tablespace_name, status FROM dba_tablespaces; SELECT file_name, status FROM dba_data_files;
Once you have identified the affected tablespace or datafile, you can then proceed to diagnose the reason for the error.
Fixing the ORA-02074 Error
1. Check for Existing Sessions
Before attempting to bring a tablespace or datafile online or offline, it’s important to check for any existing sessions that may be using the tablespace or datafile. You can do this by querying the V$SESSION and V$LOCK views in Oracle.
SELECT * FROM v$session WHERE tablespace_name = ‘your_tablespace_name’;
SELECT * FROM v$lock WHERE type = ‘TM’ AND table_space = ‘your_tablespace_name’;
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If there are any active sessions or locks on the tablespace or datafile, you will need to wait for them to be released before proceeding.
2. Check for Pending Transactions
In some cases, the ORA-02074 error can be caused by pending transactions that are preventing the tablespace or datafile from being brought online or offline. You can check for pending transactions by querying the DBA_2PC_PENDING view in Oracle.
SELECT local_tran_id, state FROM dba_2pc_pending WHERE tablespace_name = ‘your_tablespace_name’;
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If there are any pending transactions, you will need to resolve them before attempting to bring the tablespace or datafile online or offline.
3. Resolve Resource Manager Plans
Another potential cause of the ORA-02074 error is the presence of Resource Manager plans that are preventing the tablespace or datafile from being brought online or offline. You can check for Resource Manager plans by querying the DBA_RSRC_PLAN_DIRECTIVES view in Oracle.
SELECT plan, group_or_subplan FROM dba_rsrc_plan_directives WHERE tablespace_name = ‘your_tablespace_name’;
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If there are any Resource Manager plans affecting the tablespace or datafile, you will need to modify or remove them before proceeding.
4. Bring the Tablespace or Datafile Online or Offline
Once you have resolved any existing sessions, pending transactions, and Resource Manager plans, you can then proceed to bring the affected tablespace or datafile online or offline using the ALTER TABLESPACE or ALTER DATAFILE command in Oracle.
ALTER TABLESPACE your_tablespace_name ONLINE;
ALTER TABLESPACE your_tablespace_name OFFLINE;
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After executing the appropriate command, you should no longer encounter the ORA-02074 error.
Conclusion
The ORA-02074 error in Oracle can be caused by a variety of factors, including existing sessions, pending transactions, and Resource Manager plans. By diagnosing the specific cause of the error and taking the appropriate steps to resolve it, you can successfully bring the affected tablespace or datafile online or offline without encountering the error.