If you perform a validating restore job, the RMAN will simulate a restore job and verifies whether the backup copies of data and logs required for the restore are intact and usable.
Procedure
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From the CommCell Browser, expand Client Computers > client. 
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Right-click the instance, point to All Tasks and then click Browse and Restore. 
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Select Latest Backup and click View Content. 
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Select the databases and click Recover All Selected. 
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Select the option for the type of restore operation, and then click Next. An Oracle restore options dialog box appears. 
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On the General tab, click Advanced. The Advanced Restore Options dialog box is displayed. 
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On the Options tab, select the Validate check box. 
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Click OK. 
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Click OK.