SQL Server 3414: Why Database Recovery Fails at Startup
When you restart the MS SQL Server after a crash, the server implements the crash recovery process to bring the databases online. During this startup process, it performs redoing of committed transactions and undoing of uncommitted transactions. To initialize and recover databases, the server reads the startup options.
However, sometimes, the server fails to restore the master SQL database during startup and throws the error 3414. This error can also occur while restoring the backup when the server fails to read the .Bak file. The complete error message looks like:
“Windows could not start the SQL Server on the local computer. For more information, review the system event log. If this is a non-Microsoft service, contact the service vendor, and refer to service-specific error code 3414.”
This error can also occur when accessing the database in an Always On Availability Group or a failover cluster. When this error occurs, you may fail to open or access the database file. In other words, we can say the database will not be able to come online. The database goes into Suspect mode. You can try to check the state of the database by using the sys.databases (Transact-SQL) command:
The sys.databases.state_desc column displays the SUSPECT status under state_desc. In this article, we will discuss the causes of SQL Server error 3414 and the solutions to resolve it.
This error can occur due to both transient and non-transient issues in the system or server. You can check the ERROR LOG or Windows Event log to check for the specific cause. In this, you can also refer to preceding errors containing the same spid<n> value to check the related cause of the SQL Server error 3414. Some common reasons for this error are:
- The primary or other file groups are damaged
- MDF/NDF file is corrupted
- Transaction log file (.ldf) is corrupted or damaged
- System is out of space
- Incomplete rollback of transactions
- Log-in timeout issues
- Incomplete or failed recovery process
- Incomplete system shutdown
- Corrupt pages in MDF/NDF file
You may encounter this error due to transient issues (system is out-of-space, log-in time out, etc.) on your system or server, when you try to start SQL Server instance or attach/recover the database. So, first troubleshoot the transient issues in MS SQL Server. Make sure that your system has sufficient disk space and that there are no temporary failures impacting the server during startup. If the error persists and has caused by non-transient issues, like corruption in the MDF/NDF file, then follow the below solutions to resolve the SQL Server error 3414.
Solution 1 - Restore Database from Backup
If the database is in suspect mode, the best choice is to restore the backup file. First, check the integrity of the backup using RESTORE VERIFYONLY statement. This command verify the structure of the data in the backup file and helps you to check whether the file is corrupted or not. If the backup file is readable, then you can restore SQL Server database from the .Bak file using the following command:
NOUNLOAD, STATS = 5 GO
Solution 2 – Repair the SQL Database
If the backup file is not readable due to corruption, incorrect backup settings, etc., then you can use the DBCC CHECKDB command to repair the database file. Here are the steps you need to follow:
Set Database to Emergency Mode. This mode helps you bring unrecoverable damaged databases online in a physically consistent state. This mode helps you in preventing further damage by marking the database READ- ONLY. Also, it disables logging on the database to ease the repair process. To put the database in EMERGENCY mode, run the following query in SSMS:
Next, you can try copying the data from corrupt database to another fresh database. Sometimes, it helps resolve corruption issues and allows you to access the database. If it fails, then you can repair the database using the DBCC CHECKDB command with REPAIR_ALLOW_DATA_LOSS option (see below).
This command use the log-based recovery techniques to recover the inaccessible or corrupted MS SQL database. But it may result in more data loss. Also, it does not work if the transaction log is missing or corrupted. When the transaction log file is corrupted, you can rebuild it. However, it may result in transaction inconsistencies.
Solution 3 – Use a Specialized MS SQL Repair Tool
If you want to repair the corrupt MS SQL database quickly without any transactional inconsistencies or data loss, then you can use specialized MS SQL repair tools. Stellar Repair for MS SQL - Technician is one such tool that can drastically reduce repair complexities and ease the process. With this tool, you can easily repair the MDF and NDF files with complete integrity. It can even recover deleted records and tables. Moreover, it supports the selective recovery of database objects. The tool can help you resolve corruption-based errors and safely bring database files back online from suspect mode.
Conclusion
As explained above, the SQL Server error 3414 usually arises when the server fails to finish recovery of database during the startup. It primarily occurs due to corruption in the MDF/LDF/NDF files. The obvious solution is to repair the database file. For repairing the database file, the best choice is to use a specialized MS SQL repair tool, such as Stellar Repair for MS SQL - Technician. It can repair SQL database files with absolute precision. To prevent this error in future, you should monitor and track your system’s disk health and the error log regularly to detect corruption in the database beforehand.