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SQL Server 7,2000
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Data Corruption
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Disappearing DBCC Errors
13 posts, Page 2 of 2
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Disappearing DBCC Errors
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Alfredo Giotti
Alfredo Giotti
Posted Saturday, April 04, 2009 1:57 PM
SSC Rookie
Group: General Forum Members
Last Login: 2 days ago @ 2:08 PM
Points: 26,
Visits: 133
Hi Gail and Paul,
Just wanted to follow-up. Our internal hardware and storage team’s insists there are no issues with any of the drivers and hardware between the server and the SAN disks, even though they tested nothing. This has been my frustration over the years working for this company. Therefore, ever attempt I make to prove to them that it is not SQL Server, fails. I have run SQLIOSim, however, it fails to execute with VIRTUAL PROTECT errors. It is my understanding that SQLIOSim has some bugs running on Windows 2000. I even extracted the version of SQLIOSim, which is installed in the SQL 2008 bin folder, C:\Program Files\Microsoft SQL Server\MSSQL10.INST1\MSSQL\Binn , and gave that a try, no luck, same VP errors.
Any assistance is greatly appreciated.
Regards
Fred
Post #690516
Alfredo Giotti
Alfredo Giotti
Posted Friday, June 12, 2009 8:50 AM
SSC Rookie
Group: General Forum Members
Last Login: 2 days ago @ 2:08 PM
Points: 26,
Visits: 133
Hello Gail and Paul,
I am some more information detail regarding this problem.
--------------------------------------------------------------------------
Recap:
Error message during DBCC CHECKDB:
Msg 2533, Sev 16: Table error: Page (1:717080) allocated to object ID 181575685, index ID 0 was not seen.
Page may be invalid or have incorrect object ID information in its header. [SQLSTATE 42000]
Msg 0, Sev 16: DBCC For Database: QSDB Started at: Jun 12 2009 7:57AM [SQLSTATE 01000]
Run DBCC Checkdb manually no issues.
Very important note: There is a application process hitting this database and particular table at the same time DBCC is being executed every time DBCC throws these messages. I am still trying to gather details about this process. However, what I do know it is performing inserts.
--------------------------------------------------------------------------
Based on the output from DBCC I decided to check whether the page, which DBCC complained about, is actually missing, it was not and actually contains data. I am able to query the data on the page without issues.
NOTE: there were 100 errors related to the same object and all pages were available to query against.
The DBCC output also mentions index ID 0, there is no clustered index on this table. With all that said, here is my question: Is it possible, because there are no clustered indexes, that DBCC is reading the PFS page which identifies the missing pages as being allocated, however, when DBCC actually needs to read in the page in cannot be found because this application process is in a transaction and as not committed? And by the time we manually run DBCC against this particular table the process has ended and committed is the reason why we do not encounter the corruption?
NOTE: We a case open with Microsoft regarding this issue, however, I have not conveyed this information to them. But will do so shortly.
The corruption errors continue to surface even after all the drivers have been updated
Post #733926
Paul Randal
Paul Randal
Posted Friday, June 12, 2009 9:18 PM
Ten Centuries
Group: General Forum Members
Last Login: Yesterday @ 1:01 PM
Points: 1,418,
Visits: 1,019
Nope - that can't happen with DBCC in 2000 and beyond. It's stale read issue on your I/O subsystem, or something similar, or you're doing something and by the time DBCC runs, the corrupt pages have been deallocated. I don't know how else to say this - it's not DBCC, it's your hardware.
Thanks
Paul Randal
Managing Director,
www.SQLskills.com
Blog:
www.SQLskills.com/blogs/paul
Twitter:
@PaulRandal
SQL MVP, Microsoft RD, Contributing Editor of
TechNet Magazine
Author of DBCC CHECKDB/repair for SQL Server 2005
Post #734230
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