CHECKDB allocation error

Hello all,
I've got this error as result of CHECKDB command:
CHECKDB found 1 allocation errors and 4 consistency errors in database
'Data'.
repair_allow_data_loss is the minimum repair level for the errors found by
DBCC CHECKDB (Data ).
It looks like the CHECKDB with repair_allow_data_loss can solve the problem.
Is there any way to know beforehand, what data will be lost?
Thanks,
peti
Hi Peti
It would be useful to see the exact errors, but you may want to look at DBCC
PAGE, googling for "DBCC CHECKDB" AND "DBCC PAGE" comes up with quite a few
results including http://tinyurl.com/y9rk25 and http://tinyurl.com/yjabup
Reading "Inside SQL Server 2000" by Kalen Delany ISBN 0-7356-0998-5 and "The
Guru's Guide to Transact-SQL" by Ken Henderson ISBN 0-201-61576-2 will give
you useful information on these as well.
John
"peti" wrote:

> Hello all,
> I've got this error as result of CHECKDB command:
> CHECKDB found 1 allocation errors and 4 consistency errors in database
> 'Data'.
> repair_allow_data_loss is the minimum repair level for the errors found by
> DBCC CHECKDB (Data ).
> It looks like the CHECKDB with repair_allow_data_loss can solve the problem.
> Is there any way to know beforehand, what data will be lost?
> Thanks,
> peti
>
>
|||Thank you John,
I've read those posts but I'm still confused - for the error 8981, if the
dbbcc checkdb REPAIR_ALLOW_DATA_LOSS works fine, how can I find what data is
missing?
DBCC CHECKDB outcome:
DBCC results for 'conflict_edu_Script_tab'.
Server: Msg 8979, Level 16, State 1, Line 1
Table error: Object ID 772614241, index ID 1. Page (1:482455) is missing
references from parent (unknown) and previous (page (1:482777)) nodes.
Possible bad root entry in sysindexes.
There are 0 rows in 0 pages for object 'conflict_edu_Script_tab'.
http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=53072
...................
DBCC results for 'cse_CaseFolder_tab'.
Server: Msg 8981, Level 16, State 1, Line 1
Table error: Object ID 772614241, index ID 1. The next pointer of (1:482455)
refers to page (1:482776). Neither (1:482776) nor its parent were
encountered. Possible bad chain linkage.
Server: Msg 8981, Level 16, State 1, Line 1
Table error: Object ID 772614241, index ID 1. The next pointer of (1:493336)
refers to page (1:482778). Neither (1:482778) nor its parent were
encountered. Possible bad chain linkage.
There are 4622077 rows in 91565 pages for object 'cse_CaseFolder_tab'.
CHECKDB found 0 allocation errors and 3 consistency errors in table
'cse_Case_tab' (object ID 772614241).
http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=63537
...........
There are 29 rows in 1 pages for object 'cse_Note_tab'.
Server: Msg 8952, Level 16, State 1, Line 1
Table error: Database 'DB', index 'cse_Case_tab.cse_Case_ind7' (ID
1520633106) (index ID 7). Extra or invalid key for the keys:
Server: Msg 8956, Level 16, State 1, Line 1
Index row (1:24702:1) with values (CTId = 10 and ToCTA = NULL and CCId = 1
and CFId = 1049716 and CaseId = 1) points to the data row identified by ().
http://msdn.microsoft.com/library/de...err_2_6f7a.asp
http://msdn.microsoft.com/library/de...err_2_6f76.asp
/peti
"peti" <bpetigaspar@.gmail.com> wrote in message
news:eh59ee$j2v$3@.news.al.sw.ericsson.se...
> Hello all,
> I've got this error as result of CHECKDB command:
> CHECKDB found 1 allocation errors and 4 consistency errors in database
> 'Data'.
> repair_allow_data_loss is the minimum repair level for the errors found by
> DBCC CHECKDB (Data ).
> It looks like the CHECKDB with repair_allow_data_loss can solve the
problem.
> Is there any way to know beforehand, what data will be lost?
> Thanks,
> peti
>
|||Hi Peti
If there are a large number of errors the most likely cause would be a
hardware fault you would first need to eliminate what caused it before trying
to repair the database. You can always drop and re-create indexes to try and
remove any inconsistencies, what does the NOINDEX option for CHECKDB return?
John
"peti" wrote:

> Thank you John,
> I've read those posts but I'm still confused - for the error 8981, if the
> dbbcc checkdb REPAIR_ALLOW_DATA_LOSS works fine, how can I find what data is
> missing?
> DBCC CHECKDB outcome:
>
> DBCC results for 'conflict_edu_Script_tab'.
> Server: Msg 8979, Level 16, State 1, Line 1
> Table error: Object ID 772614241, index ID 1. Page (1:482455) is missing
> references from parent (unknown) and previous (page (1:482777)) nodes.
> Possible bad root entry in sysindexes.
> There are 0 rows in 0 pages for object 'conflict_edu_Script_tab'.
> http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=53072
> ...................
> DBCC results for 'cse_CaseFolder_tab'.
> Server: Msg 8981, Level 16, State 1, Line 1
> Table error: Object ID 772614241, index ID 1. The next pointer of (1:482455)
> refers to page (1:482776). Neither (1:482776) nor its parent were
> encountered. Possible bad chain linkage.
> Server: Msg 8981, Level 16, State 1, Line 1
> Table error: Object ID 772614241, index ID 1. The next pointer of (1:493336)
> refers to page (1:482778). Neither (1:482778) nor its parent were
> encountered. Possible bad chain linkage.
> There are 4622077 rows in 91565 pages for object 'cse_CaseFolder_tab'.
> CHECKDB found 0 allocation errors and 3 consistency errors in table
> 'cse_Case_tab' (object ID 772614241).
> http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=63537
> ...........
> There are 29 rows in 1 pages for object 'cse_Note_tab'.
> Server: Msg 8952, Level 16, State 1, Line 1
> Table error: Database 'DB', index 'cse_Case_tab.cse_Case_ind7' (ID
> 1520633106) (index ID 7). Extra or invalid key for the keys:
> Server: Msg 8956, Level 16, State 1, Line 1
> Index row (1:24702:1) with values (CTId = 10 and ToCTA = NULL and CCId = 1
> and CFId = 1049716 and CaseId = 1) points to the data row identified by ().
>
> http://msdn.microsoft.com/library/de...err_2_6f7a.asp
> http://msdn.microsoft.com/library/de...err_2_6f76.asp
> /peti
>
>
> "peti" <bpetigaspar@.gmail.com> wrote in message
> news:eh59ee$j2v$3@.news.al.sw.ericsson.se...
> problem.
>
>
|||It was a power failure.
In my case the clustered index is corupt (Object ID 772614241, index ID 1).
Does it mean data loss?
What means data loss - only one row or the entire table?
/peti
"peti" <bpetigaspar@.gmail.com> wrote in message
news:eh5qb1$s3r$1@.news.al.sw.ericsson.se...
> Thank you John,
> I've read those posts but I'm still confused - for the error 8981, if the
> dbbcc checkdb REPAIR_ALLOW_DATA_LOSS works fine, how can I find what data
is
> missing?
> DBCC CHECKDB outcome:
>
> DBCC results for 'conflict_edu_Script_tab'.
> Server: Msg 8979, Level 16, State 1, Line 1
> Table error: Object ID 772614241, index ID 1. Page (1:482455) is missing
> references from parent (unknown) and previous (page (1:482777)) nodes.
> Possible bad root entry in sysindexes.
> There are 0 rows in 0 pages for object 'conflict_edu_Script_tab'.
> http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=53072
> ...................
> DBCC results for 'cse_CaseFolder_tab'.
> Server: Msg 8981, Level 16, State 1, Line 1
> Table error: Object ID 772614241, index ID 1. The next pointer of
(1:482455)
> refers to page (1:482776). Neither (1:482776) nor its parent were
> encountered. Possible bad chain linkage.
> Server: Msg 8981, Level 16, State 1, Line 1
> Table error: Object ID 772614241, index ID 1. The next pointer of
(1:493336)
> refers to page (1:482778). Neither (1:482778) nor its parent were
> encountered. Possible bad chain linkage.
> There are 4622077 rows in 91565 pages for object 'cse_CaseFolder_tab'.
> CHECKDB found 0 allocation errors and 3 consistency errors in table
> 'cse_Case_tab' (object ID 772614241).
> http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=63537
> ..........
> There are 29 rows in 1 pages for object 'cse_Note_tab'.
> Server: Msg 8952, Level 16, State 1, Line 1
> Table error: Database 'DB', index 'cse_Case_tab.cse_Case_ind7' (ID
> 1520633106) (index ID 7). Extra or invalid key for the keys:
> Server: Msg 8956, Level 16, State 1, Line 1
> Index row (1:24702:1) with values (CTId = 10 and ToCTA = NULL and CCId = 1
> and CFId = 1049716 and CaseId = 1) points to the data row identified by
().
>
>
http://msdn.microsoft.com/library/de...err_2_6f7a.asp
>
http://msdn.microsoft.com/library/de...err_2_6f76.asp[vbcol=seagreen]
> /peti
>
>
> "peti" <bpetigaspar@.gmail.com> wrote in message
> news:eh59ee$j2v$3@.news.al.sw.ericsson.se...
by
> problem.
>
|||Hi
The index page is missing it's parent reference it does not necessarily mean
that it contains data. Examples of the syntax and using DBCC PAGE can be
found at http://www.sql-server-performance.com/dbcc_commands.asp and
http://www.sql-server-performance.co...tructures.asp. I assume
that you are persuing this route because you don't have a good backup that
you can roll forward? make sure you backup before correcting the database,
and you may want to compare what you have against the last good backup you
have with something like SQL Data Compare from Red Gate www.red-gate.com, or
compare the pre-repared database to the post-repaired database (which may
only confirm that you have already lost the data!).
John
"peti" wrote:

> It was a power failure.
> In my case the clustered index is corupt (Object ID 772614241, index ID 1).
> Does it mean data loss?
> What means data loss - only one row or the entire table?
> /peti
> "peti" <bpetigaspar@.gmail.com> wrote in message
> news:eh5qb1$s3r$1@.news.al.sw.ericsson.se...
> is
> (1:482455)
> (1:493336)
> ().
> http://msdn.microsoft.com/library/de...err_2_6f7a.asp
> http://msdn.microsoft.com/library/de...err_2_6f76.asp
> by
>
>