I will try to describe the file auditing method. You may try this for your sql database files.
Enable Object Access auditing
1. Open the Active Directory Users And Computers console. Right-click Domain Controller and select the Properties command from the resulting context menu.
2. Go to the Group Policy tab, select the group policy that you want to audit, click Edit, and Windows will load the Group Policy console. Navigate through the group policy console to Computer Configuration | Windows Settings | Security Settings | Local Policies | Audit Policy, as shown in the Figure.
Double click on 'Audit Object Access' and select both the 'Success' as well as 'Failure' attempts
File access auditing
Once you've enabled object auditing, go into Windows Explorer and navigate to the sql database file that you want to audit. Right-click the object and select the Properties command from the resulting context menu.
When you see the object's properties sheet, navigate to the Security tab and click the Advanced button. You'll now see the Access Control Settings For dialog box. Next, select the Auditing tab, click the Add button, and select the users or groups that you want to audit. Click OK to continue. You'll now see a long list of auditable actions related to the object. You can perform a success and/or failure audit on any of these objects by selecting the appropriate check boxes. Click OK to enable the auditing.
Note: Kindly make sure that the applied policies are working fine
Review the security logs in Event viewer for any file access on your sql database file with details.
ThanksMANU PHILIP Microsoft MVP(Exchange Server)| MCITP | MCTS | MCSA
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