You can perform a restore operation faster when you set a maximum number of concurrent open datafiles for RMAN to read simultaneously.
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 database 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 Oracle Restore Options dialog box, click Advanced.
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On the Advanced Restore Options dialog box, on the Options tab, select the number of open files from the Max Open Files list.
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Click OK.
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Click OK.