SQL Server database recovery from corrupt files involves identifying the severity of corruption in the primary database files (.mdf/.ndf) or transaction logs (.ldf) and applying a tiered restoration strategy. The recovery workflow transitions from safe, non-destructive native restores to native repairs that risk data loss, and finally to third-party recovery software if no viable database backups exist. 🛠️ Phase 1: Detecting and Assessing Corruption
Before altering database files, you must evaluate the structural integrity of the database using Microsoft’s Transact-SQL utilities.
Check Integrity: Execute DBCC CHECKDB to locate data allocation, consistency, or page-level errors.
Review Logs: Inspect the SQL Server Error Log and Windows Event Viewer for specific I/O subsystem errors (such as 823, 824, or 825).
Isolate Status: Determine if the database has flipped into a SUSPECT or RECOVERY_PENDING state due to the corrupt files. 🔄 Phase 2: Native Restore Strategy (Cleanest Recovery)
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