How to fix Error 7326 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: SQL Server Error 7326 – “An error occurred while retrieving the query text from OLE DB provider”

Why This Error Happens

This error typically occurs when SQL Server’s distributed query processor attempts to retrieve query text metadata from a linked server’s OLE DB provider, but the provider fails to respond correctly due to permission restrictions, provider misconfiguration, or an outdated/corrupted driver. It is commonly triggered during deadlock graph generation, extended events tracing, or diagnostic queries (like sys.dm_exec_sql_text) run against a session using a linked server connection. In many cases, the underlying OLE DB provider (such as MSOLEDBSQL, Oracle’s OraOLEDB, or a legacy provider) lacks the “Allow InProcess” setting or the service account does not have sufficient rights on the remote resource.

Step-by-Step Resolution Guide

Step 1: Verify and Enable “Allow InProcess” for the OLE DB Provider

  • Open SQL Server Management Studio (SSMS) and connect to the instance.
  • Navigate to Server Objects > Linked Servers > Providers.
  • Right-click the relevant provider (e.g., MSOLEDBSQL, SQLNCLI, or OraOLEDB.Oracle) and select Properties.
  • Check the box for Allow InProcess, then click OK.
  • Alternatively, run this T-SQL command (replace provider name as needed):
  EXEC sp_MSset_oledb_prop N'MSOLEDBSQL', N'AllowInProcess', 1
  • Restart the SQL Server service for changes to take effect.

Step 2: Check Linked Server Security and Login Mapping

  • Open Linked Servers > [Your Linked Server] > Properties > Security page.
  • Ensure a valid mapping exists under “For a login not defined in the list above, connections will:” — set this to “Be made using this security context” with valid remote credentials.
  • Confirm the SQL Server service account has network access to the remote OLE DB data source (check firewall rules on Windows Server 2025 if the linked server is remote).
  • Test connectivity using:
  EXEC sp_testlinkedserver 'YourLinkedServerName';

Step 3: Update or Reinstall the OLE DB Driver

  • Confirm you are using the latest supported driver (Microsoft recommends MSOLEDBSQL 19.x or later for SQL Server 2025 compatibility).
  • Download the latest driver from the official Microsoft Download Center.
  • Uninstall the old provider via Control Panel > Programs and Features, then reinstall the updated MSI package.
  • Re-register the provider in SQL Server by recreating the linked server:
  EXEC sp_dropserver 'YourLinkedServerName', 'droplogins';
  EXEC sp_addlinkedserver 'YourLinkedServerName', 'SQLNCLI', 'MSOLEDBSQL', 'RemoteServerName';

Step 4: Disable Extended Events or Trace Capturing Query Text (Temporary Workaround)

  • If the error only appears during deadlock monitoring or XEvent sessions, disable the sql_text or query_text action temporarily.
  • In SSMS, go to Management > Extended Events > Sessions, right-click your active session, and remove the problematic action field.
  • This prevents SQL Server from calling the OLE DB provider’s IDBCommandText interface, which is the root cause of the 7326 failure in diagnostic contexts.

Alternative or Verification Steps

  • To verify the fix, run a test distributed query against the linked server (e.g., SELECT * FROM [LinkedServerName]...[TableName]) and confirm no 7326 error appears in the SQL Server Error Log.
  • If the issue persists, check the Windows Event Viewer (Application log) on Windows Server 2025 for correlating OLE DB provider errors, and consider switching to a native connector (such as ODBC via sp_addlinkedserver with the MSDASQL provider) as a fallback.