SQL Server Error Code Fixes
Step-by-step guides for every major SQL Server error. Find your error code below and follow the complete fix procedure.
SQL Server Error 823 — Hard I/O Error
Fatal hardware-level read/write failure. SQL Server could not read a data page. Usually indicates a failing drive or bad sector.
Error 824SQL Server Error 824 — Logical I/O Error
Page was read successfully but its checksum doesn't match. Indicates a torn page, usually from a power outage during a write.
Error 8946SQL Server Error 8946 — Invalid Page Header
Allocation page header has been corrupted. Detected by DBCC CHECKDB. Requires emergency mode repair or restore from backup.
Error 9001SQL Server Error 9001 — Log Not Available
The transaction log for this database is not available. Usually caused by a missing, deleted, or corrupt LDF file.
Error 3414SQL Server Error 3414 — Recovery Failed
SQL Server failed to run the recovery process on startup. Database is marked SUSPECT. Requires emergency mode intervention.
Error 5172SQL Server Error 5172 — MDF Header Invalid
The MDF file header is not recognized as a valid SQL Server database file. Caused by corruption, version mismatch, or partial writes.
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