You can perform a restore operation more quickly when you set a maximum number of concurrent open datafiles for RMAN to read simultaneously.
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From the CommCell Browser, go to Client Computers > RAC client.
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Right-click the instance, then go to All Tasks > Browse and Restore.
The Browse and Restore Options dialog box appears.
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Select Latest Backup, and then click the View Content button.
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Select the database, and then click the Recover All Selected button.
The Oracle Restore Options dialog box appears.
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Depending on the type of restore to be run, click Restore in place or Restore out of place, and then click Next.
The Oracle In Place Restore Options or Oracle Out of Place Restore Options dialog box appears.
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Click the Advanced button.
The Advanced Restore Options dialog box appears.
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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 to start the restore.