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DBCC CHECKDB error in Software Factory database

  • 11 October 2019
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Hugo Nienhuis
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I performed a DBCC CHECKDB on our databases and it found an error in our SF database:

Msg 8947, Level 16, State 1, Line 1
Table error: Multiple IAM pages for object ID 349973069, index ID 1, partition ID 72057598823759872, alloc unit ID 72057598842699776 (type In-row data) contain allocations for the same interval. IAM pages (1:396048) and (1:292862).
CHECKDB found 1 allocation errors and 0 consistency errors in table 'linked_project' (object ID 349973069).
CHECKDB found 1 allocation errors and 0 consistency errors in database 'DB_software_factory'.
repair_allow_data_loss is the minimum repair level for the errors found by DBCC CHECKDB (DB_software_factory).

I have no clean backup and the DBCC is not able to repair the error.

I can do a clean install of the SF, but I will need to export/import the projects. Is this possible? Are there other solutions, like replacing the 'linked_project' table?
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Best answer by Anne Buit 15 October 2019, 11:21

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Hugo Nienhuis
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Hi,

 

I finally managed to free up some time to repair the sf database. I succesfully recreated the linked_project table and the DBCC comes back error-free :-)

 

However, how do i know which related baseprojects I should have? Is there a complete list of baseprojects?

Anne Buit
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Hi Hugo,

Without delving deeper into the problem, the easiest way to deal with this is probably to export as much data as possible from the linked_project table. Disable all triggers, constraints and foreign keys, truncate the table and re-insert the exported data.

Hugo Nienhuis
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I have already done so, resulting in a could not repair this error, see below. There is no data missing in the table.

Repair: IAM chain for object ID 349973069, index ID 1, partition ID 72057598823759872, alloc unit ID 72057598842699776 (type In-row data), has been truncated before page (1:396048) and will be rebuilt.
Msg 8947, Level 16, State 1, Line 1
Table error: Multiple IAM pages for object ID 349973069, index ID 1, partition ID 72057598823759872, alloc unit ID 72057598842699776 (type In-row data) contain allocations for the same interval. IAM pages (1:396048) and (1:292862).
Could not repair this error.
Msg 8969, Level 16, State 2, Line 1
Table error: IAM chain linkage error: Object ID 349973069, index ID 1, partition ID 72057598823759872, alloc unit ID 72057598842699776 (type In-row data). The next page for IAM page (1:292862) is (1:396048), but the previous link for page (1:396048) is (0:0).
Anne Buit
Rank
Userlevel 7
Badge +5
Hi Hugo,

Can you create a back-up of the database and run:
code:
DBCC CHECKDB(DB_software_factory, REPAIR_ALLOW_DATA_LOSS);

Afterwards, please check the base projects for your work projects. If they are empty or some are missing, they might have to be re-added manually.

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