In addition, according to Microsoft, opportunistic locking can increase the risk of database corruption when a file is shared by two or more clients on a network file server.
Summary Information about Opportunistic Locking on Windows NT/2000/XP
For more detailed information regarding Opportunistic Locking, please see the following Microsoft Knowledgebase articles:
Opportunistic Locking on Windows NT
Opportunistic Locking on Windows 2000/XP
Disabling Opportunistic Locking on Windows NT/2000/XP:
IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows Registry
Disclaimer: Telexis makes no warranties for the instructions given in the Microsoft Knowledgebase article referenced above, or for the utilities and registry entries reproduced on this web page. You agree to make all registry changes at your own risk.
To disable Opportunistic Locking by downloading and installing the Windows 2000/XP registry utility:
1. Click on the desired REG file listed below to begin downloading the file:
2. Store the file to a temporary folder on the desired workstation or server computer.
3. Once downloaded, double-click on the file to add the entry to the Windows registry.
4. Re-boot the computer.
5. Perform the above steps on all Windows 2000/XP computers.
To disable Opportunistic Locking manually on a Windows 2000/XP Workstation computer:
1. Enter the OplocksDisabled entry into the below registry key:
OplocksDisabled REG_DWORD 0 or 1
2. Set the value to 1 to disable Oplocks
3. Reboot the workstation computer.
NOTE: The OplocksDisabled registry value configures Windows clients to either request or not request opportunistic locks on a remote file.
To disable Opportunistic Locking manually on a Windows 2000/XP Server computer:
1. Enter the EnableOplocks entry into the below registry key:
EnableOplocks REG_DWORD 0 or 1
2. Set the value to 0 to disable Oplocks.
3. Reboot the server computer.
NOTE: The EnableOplocks value configures Windows-based servers (including Workstations sharing files) to allow or deny opportunistic locks on local files.
To disable Opportunistic Locking manually on a Windows NT Server or Workstation computer:
Follow the instructions listed in the below Microsoft Knowledge Base article.
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