How to fix Error 5263 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: SQL Server Error 5263 – Incorrect Row Count(s) for Table

Why This Error Happens

Error 5263 occurs when SQL Server 2025’s consistency checker (DBCC CHECKTABLE/CHECKDB) detects that the row counts stored in the internal metadata (sys.partitions or sys.dmdbpartition_stats) do not match the actual number of rows physically present in the table or index. This discrepancy is typically caused by corrupted non-clustered index pages, an improperly terminated transaction during a bulk insert/delete operation, or disk-level corruption from a sudden power loss or storage failure on the underlying NTFS/ReFS volume. In rarer cases, this is triggered by running SQL Server on Windows Server 2025 with a storage driver that doesn’t properly flush write caches, leading to torn pages.

Step-by-Step Resolution Guide

Step 1: Run a Full Diagnostic Check

  • Open SQL Server Management Studio (SSMS) or Azure Data Studio connected to the affected instance.
  • Execute DBCC CHECKTABLE ('YourTableName') WITH ALL_ERRORMSGS, NO_INFOMSGS; to confirm the scope of the corruption.
  • Review the output for additional associated errors (such as 8928 or 2533) that indicate physical page corruption alongside the count mismatch.

Step 2: Isolate and Backup the Database

  • Immediately take a full backup of the database (even if corrupted) to preserve the current state before attempting repairs: BACKUP DATABASE [YourDB] TO DISK = 'C:\Backups\YourDB_PreRepair.bak';
  • Place the database in SINGLE_USER mode to prevent further writes during the repair process: ALTER DATABASE [YourDB] SET SINGLE_USER WITH ROLLBACK IMMEDIATE;

Step 3: Execute the Repair Command

  • Run the targeted repair statement, as the count mismatch is usually resolved without data loss via: DBCC CHECKTABLE ('YourTableName', REPAIR_REBUILD);
  • If the error persists specifically on an index, rebuild the non-clustered indexes manually using: ALTER INDEX ALL ON YourTableName REBUILD;
  • Avoid using REPAIR_ALLOW_DATA_LOSS unless the REPAIR_REBUILD step fails, as it may delete inconsistent rows entirely.

Step 4: Restore Multi-User Access

  • Once the repair commands complete successfully, return the database to multi-user mode: ALTER DATABASE [YourDB] SET MULTI_USER;
  • Verify that application connectivity strings are correctly re-establishing sessions with the Windows Server 2025 instance.

Alternative or Verification Steps

  • Re-run DBCC CHECKTABLE ('YourTableName') WITH NO_INFOMSGS; immediately after the repair; a clean return with 0 allocation errors and 0 consistency errors confirms the fix.
  • If corruption recurs immediately after repair, check the Windows Event Viewer (System Logs) for underlying Disk or NTFS corruption warnings, as this suggests a hardware-level failure requiring a full restore from a clean backup rather than a logical repair.