DBCC CHECKDB

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DBCC CHECKDB

SQLDCH

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August 19, 2014 at 10:28 pm

#298488

Comments posted to this topic are about the item DBCC CHECKDB
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August 20, 2014 at 2:32 am

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Koen Verbeeck SSC Guru Points: 259115 More actions · Answer 1

Nice question, thanks.

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Carlo Romagnano SSC-Insane Points: 22680 More actions · Answer 2

Carlo Romagnano

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Points: 22680

August 20, 2014 at 3:16 am

#1739513

Nice question!

Thanks!

😀

Michael_Garrison Hall of Fame Points: 3110 More actions · Answer 3

Got my coffee and took my time reading the question and the documentation. Patience and learning paid off, learned somthing, great question.

Zagyg SSCrazy Points: 2091 More actions · Answer 4

realised i made a mistake moments after touching submit.

Me too - when I saw that message saying "sorry, you were wrong"! :hehe:

Ed Wagner SSC Guru Points: 287026 More actions · Answer 5

I knew it looked too easy and there had to be trick in there. I forgot about the limit by using TABLOCK.

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SqlMel SSCrazy Points: 2901 More actions · Answer 6

In my case, I didn't know about the limit when using TABLOCK, so I learned something today.

Well, I don't feel so bad since 83% so far have been incorrect also 🙂

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Mel. 😎

Raghavendra Mudugal SSChampion Points: 10658 More actions · Answer 7

SqlMel (8/20/2014)
In my case, I didn't know about the limit when using TABLOCK, so I learned something today.
Well, I don't feel so bad since 83% so far have been incorrect also 🙂

+1

ww; Raghu
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The first and the hardest SQL statement I have wrote- "select * from customers" - and I was happy and felt smart.

ssimmons 2102 SSCommitted Points: 1634 More actions · Answer 8

hmmm - I'm looking at 2014 docs, looks like it does run DBCC CheckCatalog

SQLRNNR SSC Guru Points: 281334 More actions · Answer 9

This question highlights another great example of bad (conflicting) documentation.

Within the same documentation one will find both of the following statements.

DBCC CHECKDB does not examine disabled indexes.

And

Unless NOINDEX is specified, DBCC CHECKDB performs both physical and logical consistency checks on a single table and on all its nonclustered indexes.

That last one is stated twice for good measure.

SQL 2012 Version

http://msdn.microsoft.com/en-us/library/ms176064(v=sql.110).aspx

For good measure, the document is nearly the same for SQL 2014 (other areas changed but those statements were not).

http://msdn.microsoft.com/en-us/library/ms176064(v=sql.120).aspx

Even better is that the 2014 document has information regarding compatibility 90 which is not supported in SQL 2014.

You can read a bit about the compatibility levels here[/url].

Jason...AKA CirqueDeSQLeil
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paul.knibbs SSCoach Points: 15320 More actions · Answer 10

Internal note: try reading the *whole* MSDN bit about TABLOCK before answering...missed that very important last line! 🙁

Marcia J SSCertifiable Points: 5649 More actions · Answer 11

Good job of documenting the reasons for why each answer was right or wrong.

TomThomson SSC Guru Points: 104773 More actions · Answer 12

Nice question. 😎

But I have one niggle :hehe:: you can't run that command against tempdb, because it is specifically acting of the database 'myDatabase' :laugh::crazy:; but it was absolutely obvious what you meant to ask so it's hard to see why so many people got that wrong :-P:laugh:. Unless of course they believe in being secure so that they normally log in as a user who doesn't have the permissions needed to run dbcc checdb against tempdb and think that QotD should be aimed at people who behave securely.

But anyway, any other choice for the second correct option was obviously wrong :w00t:, so even security lovers should have gotten it right.

Tom

SQLDCH SSChampion Points: 11635 More actions · Answer 13

ssimmons 2102 (8/20/2014)
hmmm - I'm looking at 2014 docs, looks like it does run DBCC CheckCatalog

Do you have a link? The link I sent is for 2014; under the TABLOCK directive explanation it says fairly clearly:

"TABLOCK limits the checks that are performed; DBCC CHECKCATALOG is not run on the database, and Service Broker data is not validated."

Granted I did not explore past this document.

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