title LOCALDB_ERROR_SQL_SERVER_STARTUP_FAILED | Microsoft Docs ms.custom ms.date 03/04/2017 ms.prod sql-server-2016 ms.reviewer ms.suite ms.technology docset-sql-devref ms.tgt_pltfrm ms.topic reference ms.assetid e3e5e5dc-21dc-42fc-82a6-730fed46ef16 caps.latest.revision 8 author JennieHubbard ms.author jhubbard manager jhubbard LOCALDB_ERROR_SQL_SERVER_STARTUP_FAILED Details Product Name SQL Server Event ID 266 Event Source SQL Server Local Database Runtime 12.0 Component Local Database Runtime API Message Text Error occurred during Local Database instance startup: SQL Server process failed to start. Explanation A SQL Server process is started but SQL Server startup failed. User Action See the event log for details.