Are you encountering the ORA-00090 error in your Oracle database? This error can be frustrating, but with the right approach, you can diagnose the root cause and fix it effectively. In this article, we will explore the common issues related to ORA-00090 and provide solutions to help you resolve the error.
Commonly Faced Issues and Solutions
1. Insufficient Undo Tablespace
One of the common causes of ORA-00090 is an insufficient undo tablespace. When the undo tablespace runs out of space, it can lead to this error. To address this issue, you can increase the size of the undo tablespace or add additional data files to accommodate the growing undo data.
ALTER TABLESPACE undotbs1
ADD DATAFILE '/path/to/newfile.dbf' SIZE 100M;
2. Long-Running Transactions
Long-running transactions can also trigger the ORA-00090 error. If there are transactions that are holding onto undo data for an extended period, it can lead to undo tablespace exhaustion. To address this issue, you can identify and terminate long-running transactions using the following query:
SELECT SID, SERIAL#, USERNAME, STATUS
FROM V$SESSION
WHERE STATUS = 'ACTIVE' AND USERNAME IS NOT NULL;
Once you have identified the long-running transactions, you can terminate them using the following command:
ALTER SYSTEM KILL SESSION 'sid,serial#';
3. Undo Retention Setting
The undo retention setting specifies the minimum amount of time that Oracle should retain undo data before overwriting it. If the undo retention is set too high, it can lead to undo tablespace exhaustion. To address this issue, you can adjust the undo retention setting using the following command:
ALTER SYSTEM SET UNDO_RETENTION = 1800;
FAQs
Q: What does the ORA-00090 error signify?
A: The ORA-00090 error indicates that the undo tablespace has exceeded its limit and cannot accommodate additional undo data.
Q: How can I prevent the ORA-00090 error from occurring?
A: To prevent the ORA-00090 error, you can regularly monitor the undo tablespace usage and adjust its size as needed. Additionally, you can identify and address long-running transactions to free up undo space.
By understanding the common causes of the ORA-00090 error and implementing the appropriate solutions, you can effectively diagnose and fix this issue in your Oracle database. Whether it’s adjusting the undo tablespace size, addressing long-running transactions, or modifying the undo retention setting, taking proactive measures can help mitigate the occurrence of this error.
