# Manage Oracle backup RMAN scripts

Before you run a backup, you can preview and customize the RMAN script that Commvault generates from your backup options. Use this to verify that Oracle tag variable values are not truncated, or to add commands and parameters that are not available in the UI.

For example, by default Commvault does not compress Oracle backup sets. You can customize the script to add compression if storage is a concern.

Important

- If you customize the RMAN script and a backup job fails, the job does not resume from the point of failure. Commvault restarts the backup from the beginning.

- The first line of the RMAN script must be `run {` or `RUN {` with no trailing spaces after the `{`.

  - `run {`: Commvault parses and validates the script.

  - `RUN {`: Commvault does not parse or validate the script.

## Procedure

1. From the Command Center navigation pane, go to Protect > Databases.

2. On the Instances tab, click the instance.

3. On the Subclients tab, click the subclient.

4. In the upper-right area of the window, click Backup.

5. Click Preview.

6. Review the script on the Database script or Archive log script tab.

7. To customize the script, click Customize.

8. Edit the script as needed.

9. Click Submit.

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