How to troubleshoot when the Oracle temporary tablespac…

When the Oracle temporary tablespace is full, it could be due to the following reasons:

1. The temporary tablespace is too small: check if the size of the temporary tablespace is sufficient, if not, you can increase the size of the temporary tablespace.
2. Long-running queries are occupying the temporary tablespace: Queries that run for a long time may consume a large amount of temporary tablespace. You can use the following SQL statement to find the session that is using the most temporary tablespace.
3. Retrieve the session ID, serial number, username, tablespace, and blocks used for sorting from the v$session and v$sort_usage views, where the session address in v$session is equal to the session address in v$sort_usage, and order the results by blocks used in descending order.
4. If a session is found to be using a significant amount of temporary tablespace, the session can be terminated or its queries can be optimized.
5. The temporary tablespace rollback segment is too small: the size of the rollback segment used by the temporary tablespace may not be sufficient to support the current query requirements. You can either increase the size of the rollback segment or increase the number of rollback segments.
6. The temporary tablespace is being misused by other users or sessions: it is possible that other users or sessions are performing a large number of temporary operations in the temporary tablespace, causing it to run out of space. You can use the SQL statement above to find the session using the most temporary tablespace and understand the operations it is executing.
7. Temporary tablespace file is damaged or full: Check if the temporary tablespace file is full or damaged. You can use the following SQL statement to find the temporary tablespace file and its usage:
8. Show the file name, size in bytes, maximum size in bytes, number of blocks allocated, and status for all temporary files.
9. If the file is full or damaged, you can either increase the size of the file or add a new temporary tablespace file.

Here are some possible reasons and investigation methods for a full temporary tablespace in Oracle. Choose the appropriate solution based on your specific situation.