How to retrieve a closed temporary file in PL/SQL?

2 years ago
Isabella Edwards
2 minutes

Temporary files in PL/SQL are files stored on the database server, and their lifecycle typically ends when the session is closed, at which point they are automatically closed and deleted. Therefore, closed temporary files cannot be directly retrieved.

However, you can indirectly retrieve closed temporary files using the following methods:

  1. Before using temporary files in a conversation, be sure to back them up to another location. That way, even if the temporary file is closed or deleted, you can still recover it from the backup.
  2. If you are using an Oracle database, you can attempt to recover temporary files from the database’s rollback segment. Rollback segments are special areas used to store temporary data of transactions, which are typically preserved for a period after the transaction ends. You can use a SQL query similar to the following to locate and recover temporary files from the rollback segment.
SELECT name FROM v$tempfile WHERE status = 'RECOVER';

-- 使用RECOVER TEMPFILE语句恢复临时文件
RECOVER TEMPFILE '/path/to/tempfile.dbf';

Please note that this requires appropriate permissions to execute, and the recovered files may be in use by other active sessions, so please proceed with caution.

In short, even though you can’t directly retrieve closed temporary files, you can recover them indirectly through backup and rollback methods.

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