In a Windows configuration that uses Oracle 12c or a more recent Oracle version, you must grant full control permission for the Oracle home user for the Commvault folder. Without these permissions, backup jobs will fail to complete on Windows-based Oracle databases.
The Oracle home user is the user that starts the Oracle service (OracleService<SID>).
Procedure
Make sure that the Oracle user is part of the administrator group and the ora_dba group. If the user is not part of the administrator group, assign permissions for the user:
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Grant full control permission for the ContentStore folder. - 
From Windows Explorer or File Explorer, right-click the ContentStore folder and select Properties. 
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Click the Security tab. 
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Select the user and click Edit or click Add if the user does not exist. 
 
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Select the Allow check box for Full Control permission for the user and then click OK. 
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Grant full control permission for the CommVault registry: - 
From the Registry Editor, navigate to HKEY_LOCAL_MACHINE | SOFTWARE. 
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Right click CommVault Systems and select Permissions.... 
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Select the user and click Edit or click Add if the user does not exist. 
 
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When UAC is enabled, add the user to the Local Security Policy: - 
From Local Security Policy, navigate to User Right Assignment. 
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Right-click Impersonate a client after authentication and then select Properties. 
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Click Add User or Group and then click OK. 
 
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