| Event Id | 2577 |
| Source | MSSQLServer |
| Description | Chain sequence numbers out of order in the Index Allocation Map (IAM) chain for object ID O_ID, index ID I_ID, partition ID PN_ID, alloc unit ID A_ID (type TYPE). Page P_ID1 with sequence number SEQUENCE1 points to page P_ID2 with sequence number SEQUENCE2. |
| Event Information | According to Microsoft : Cause : Every Index Allocation Map (IAM) page has a sequence number. The sequence number is the position of the IAM page within the IAM chain. The rule is that sequence numbers increase by one for each IAM page. IAM page, P_ID2, has a sequence number that does not follow this rule. Resolution : 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. 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 BackupIf the problem is not hardware related and a known clean backup is available, restore the database from the backup.Run DBCC CHECKDBIf 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. |
| Reference Links | Event ID 2577 from source MSSQLServer |
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