Restoring Oracle Tablespace: Resolving the table or view does not exist Issue

Описание: Learn how to effectively restore your Oracle tablespace and resolve the `table or view does not exist` error after dropping a table. This guide breaks down the steps for a smooth recovery process.
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Restoring Oracle Tablespace: Resolving the table or view does not exist Issue

When managing Oracle databases, it's not uncommon to encounter errors, especially when dealing with tablespaces and data recovery. One particularly frustrating issue arises when you attempt to access a table after restoring a tablespace, only to encounter the message: the table or view does not exist. If you've been facing this problem, read on – we'll explain why it happens and how you can solve it.

Understanding the Problem

Let's set the context with a typical scenario faced by many Oracle Database Administrators:

You have created a tablespace and a table within it.

After taking a backup of the database, you decide to drop the table.

Following this, you attempt to restore the tablespace via RMAN commands but still cannot access the dropped table.

This can be quite perplexing because the steps you followed seemed logical and executed without error. So, why does the table still seem to be missing? Here’s why:

Reasons for the Issue

Tablespace Offline: When you take a tablespace offline, changes made to it after the last backup will not be recognized.

Restore Operation: Restoring the tablespace returns it to the state of your last backup, but it does not undo subsequent actions.

Recovery Process: During recovery, the Oracle instance applies all changes made to that tablespace, including the action of dropping the table.

The Solution: Point In Time Recovery

The key to resolving this issue lies in employing a method called Point In Time Recovery. This method allows you to restore your database to a specific moment, ideally right before the table was dropped. Here’s how to do it step-by-step:

Step-by-Step Guide for Point In Time Recovery

Identify the SCN: Determine the SCN (System Change Number) from the time just before you dropped the table. This can often be retrieved from the backup logs or database alerts.

Execute RMAN Commands:
Here’s the RMAN script you should run:

[[See Video to Reveal this Text or Code Snippet]]

Set Until SCN: This command sets the recovery to stop at the specified SCN, ensuring you return to the correct state.

Restore Database: Initiates the restoration process from the last backup.

Recover Database: Applies the necessary redo logs to bring your database back to the state it was in at the specified SCN.

Alter Database Open Resetlogs: Opens the database and allows you to reset the logs.

Conclusion

Using the Point In Time Recovery method is crucial when dealing with unexpected data loss in your Oracle databases. By restoring the database to just before the table was dropped, you alleviate the table or view does not exist error and ensure that your data remains intact.

With this guide, you should feel more equipped to tackle similar situations in the future. Good luck, and happy database managing!