SQL 2012 :: Identifying What Caused Corruption

May 7, 2014

I had a database in suspect mode this morning.

Fixed it by:

-placing in emergency mode.

-set single_user mode

-dbcc checkdb(N'dbname', REPAIR_ALLOW_DAT_LOSS)

-Rebuild the log.

-bring online.

DBCC Checkdb returned a bunch of errors:

Extent (3:394032) in database ID 7 is allocated by more than one allocation object. The error has been repaired.

Msg 8913, Level 16, State 1, Line 2

Extent (3:394032) is allocated to 'GAM' and at least one other object.The error has been repaired.

--Lots of these

Repair: Deleted off-row data column with ID 562825134080, for object ID 1076927654, index ID 1, partition ID 72057594039566336, alloc unit ID 72057594044153856 (type LOB data) on page (3:393971), slot 28.
Repair: Deleted off-row data column with ID 562825199616, for object ID 1076927654, index ID 1, partition ID 72057594039566336, alloc unit ID 72057594044153856 (type LOB data) on page (3:393971), slot 29.
Repair: Deleted off-row data column with ID 562825265152, for object ID 1076927654, index ID 1, partition ID 72057594039566336, alloc unit ID 72057594044153856 (type LOB data) on page (3:393971), slot 30.

Lots of these:

Msg 8945, Level 16, State 1, Line 2
Table error: Object ID 1076927654, index ID 1 will be rebuilt.
The error has been repaired.
Msg 8977, Level 16, State 1, Line 2
Table error: Object ID 1076927654, index ID 1, partition ID 72057594039566336, alloc unit ID 72057594044088320 (type In-row data). Parent node for page (3:394009) was not encountered.
The error has been repaired.

[code]....

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