MSSQLSERVER_8974

Product Name | SQL Server
Event ID | 8974
Event Source | MSSQLSERVER
Component | SQLEngine
Symbolic Name | DBCC3_OFF_ROW_DATA_NODE_HAS_TWO_PARENTS
Message Text | Table error: Object ID O_ID, index ID I_ID, partition ID PN_ID, alloc unit ID A_ID (type TYPE). The off-row data node at page P_ID1, slot S_ID1, text ID TEXT_ID is pointed to by page P_ID2, slot S_ID2 and by page P_ID3, slot P_ID3.

An off-row data node has two data or index records that list it as a child node. A node can have only one parent node.

### Look for Hardware Failure

Run hardware diagnostics and correct any problems. Also examine the Microsoft Windows system and application logs and the SQL Server error log to see whether the error occurred as the result of hardware failure. Fix any hardware-related problems that are contained in the logs.

If you have persistent data corruption problems, try to swap out different hardware components to isolate the problem. Check to make sure that the system does not have write-caching enabled on the disk controller. If you suspect write-caching to be the problem, contact your hardware vendor.

Finally, you might find it useful to switch to a new hardware system. This switch may include reformatting the disk drives and reinstalling the operating system.

### Restore from Backup

If the problem is not hardware related and a known clean backup is available, restore the database from the backup.

### Run DBCC CHECKDB

If no clean backup is available, run DBCC CHECKDB without a REPAIR clause to determine the extent of the corruption. DBCC CHECKDB will recommend a REPAIR clause to use. Then, run DBCC CHECKDB with the appropriate REPAIR clause to repair the corruption.

Caution
If you are not sure what effect DBCC CHECKDB with a REPAIR clause has on your data, contact your primary support provider before running this statement.

If running DBCC CHECKDB with one of the REPAIR clauses does not correct the problem, contact your primary support provider.

#### Results of Running REPAIR Options

The off-row data node on page P_ID1 will be deleted and both references on pages P_ID2 and P_ID3 will be deleted.

Caution
This repair might cause data loss.