Question

dbcc report analyze !

Asked by: Deepak_FIL

Hi,
I am seeing lot of errors like this in my ASE dbcc report. Could someone please advise what to do in this case.
Fault Type: 100039 (incorrect extent oampage); Soft fault upgraded to Hard fault
Extent OAM page reference is set incorrectly.
page id:  361472
page id actual:  1379329
verification time:  Sep  7 2009  3:00PM
 
Fault Type: 100039 (incorrect extent oampage); Soft fault upgraded to Hard fault
Extent OAM page reference is set incorrectly.
page id:  361728
page id actual:  1379329
verification time:  Sep  7 2009  3:00PM
 
Fault Type: 100039 (incorrect extent oampage); Soft fault upgraded to Hard fault
Extent OAM page reference is set incorrectly.
page id:  361984
page id actual:  1379329
verification time:  Sep  7 2009  3:00PM

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Asked On
2009-09-07 at 22:22:51ID24713893
Tags

Sybase ASE 15

Topic

Sybase Database

Participating Experts
2
Points
125
Comments
6

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Answers

 

by: alpmoonPosted on 2009-09-07 at 23:58:29ID: 25279194

You should be able to see the actual object name as well. If it is sysprocedures, there is a solved case for 100039 (if it is a user object, it would be easier to fix as mentioned below):

Products : ASE 15
Platform : ANY

Problem : dbcc fault 100039 (Extent OAM page reference is set incorrectly) on sysprocedures.
Tip or Workaround
 
Resolution
100039 Errors are reported in ASE 15.0 because of an enhancement in checkstorage. See details below on impact & how to fix:

The main impact is for partition/unpartition. These faults are not serious and can safely be ignored or to exclusion list using sp_dbcc_exclusions:

Fault 100039 can be cleared on tables performing reorg rebuild, but this cannot be done on system tables.

=> Enhancements were brought about in ASE 15.0.2 (via CR#441924 - details below) which extended sp_fixindex to work as 'reorg rebuild' for system catalog.

Also, for information, thanks to enhancements in CR#534553 (details below) implemented in ASE 15.0.3 , dbcc checkalloc/tableallloc can fix 100039 Errors.

CR details - for information:
============================================================CR#441924 "DDLRLC: Extending sp_fixindex to work as 'reorg rebuild' for system catalog."

Sanitized: sp_fixindex procedure is enhanced to work on all the indexes instead of single index. At the same time it will mimic the behavior of 'reorg rebuild' (reclaims the un-used space from the data layer) while rebuilding placement index / clustered index.

Fixed in ASE 15.0.2 IR
============================================================

CR#534553 "DBCC: dbcc checkalloc/tableallloc should fix 100039 errors reported by checkstorage"

Workaround: reorg rebuild or Bulk copy the data out and back in

Sanitized: "DBCC TABLEALLOC/TEXTALLOC/INDEXALLOC when run in 'OPTIMIZED' mode and with the 'FIX' option
supports the correction of '100039' faults reported by DBCC CHECKSTORAGE for user tables; this
fault describes an incorrect extent OAM page hint."
=> Fixed in ASE 15.0.3
============================================================

To run sp_fixindex on sysprocedures, you can do the following:

1. Put the database in single user mode by doing the following from within the master database:

sp_dboption <database_name>, "single user", true
go


2. Allow updates to system tables:

sp_configure "allow updates", 1
go

3. Checkpoint the database:

use <database_name>
go
checkpoint
go

This is now automated so no longer needed, but still a good idea to do just to be sure.

4. Run sp_fixindex using object_name= "sysprocedures" ---find the table name by object id. and index_ID = 1 :

sp_fixindex <database_name>, syprocedures, 2

5. Clean up after yourself:

use master
go
sp_configure "allow updates", 0
go
sp_dboption <database_name>, "single", false
go
use <database_name>
go
checkpoint
go

6. Now check to see if the 100039 faults have been
resolved.




It is safe to bcp out sysprocedures and back in to resolve this issue, however I would advise trying sp_fixindex first.
NOTE: Before bcp out/in of sysprocedures you would need to take a database dump, in case anything went wrong.


Steps to rebuild using bcp out/in (and by select into)
=======================================================
1. first enable system table updates
sp_configure "allow updates",1

2. bcp out the sysprocedures table..
you may also do another way : select * into my_procedures from sysprocedures

3. delete sysprocedures

4. bcp in the data
- or insert sysprocedures select * from my_procedures

5. sp_configure "allow updates",0

 

by: Deepak_FILPosted on 2009-09-08 at 00:20:01ID: 25279285

Hi,

Thanks for the detailed advse....but i am still confused. This error comes on 15 user tables in my bond_market database. It is not on sysprocedures tables ..these are all user tables.

What should be done to get rid of these on these user tables ??

Thanks
Deepak

 

by: alpmoonPosted on 2009-09-08 at 00:32:44ID: 25279369

If it is the case you can run reorg rebuild:

reorg rebuild <table_name> <index_name>

You can ignore index name option if you want to rebuild all indexes.

But, don't forget that it will lock the table.

 

by: Deepak_FILPosted on 2009-09-08 at 00:45:22ID: 25279447

Thanks, but can you please throw some light why this error comes and what is the root cause of this.
Some study links etc are also invited for this type of error.

thanks

 

by: BenSladePosted on 2009-09-08 at 14:07:03ID: 25286169

You can run 'sp_dbcc_help_fault 100039' which will say:

> Description of the fault corresponding to checkstorage type_code 100039:
>    Extent OAM page reference is set incorrectly.
> Recommended corrective action for the fault corresponding to checkstorage type_code 100039:
>    Bulk copy the data out and back in.
>    Contact Sybase Technical Support if the recommended corrective action does not resolve the faults.


Note that the message copied by alpmoon says "These faults are not serious and can safely be ignored or [added] to exclusion list using sp_dbcc_exclusions" (I added the square brackets).  This seems to say you can ignore these errors.   Note that the sp_dbcc_summaryreport stored proc does not properly ignore errors in sp_dbcc_exclusions.

I've noticed that I see more errors misc like this when the db is under heavy update load when the dbcc checkstorage job is running.   See if the errors go away if dbcc checkstorage is run under light load.   Also see if the errors go away over time from normal db page allocation/deallocation activities.

Also note that the Sybase web page http://m.sybase.com/detail?id=1061617 list a fix in ASE 15.0.3 for bug id 534553 saying:

DBCC TABLEALLOC/TEXTALLOC/INDEXALLOC when run in 'OPTIMIZED' mode and with the 'FIX' option supports the correction of '100039' faults reported by DBCC.  CHECKSTORAGE for user tables; this fault describes an incorrect extent OAM page hint.

Ben

 

by: alpmoonPosted on 2009-09-08 at 16:29:35ID: 25287069

Actually, if you want to understand how OAM page functions, you should check Performance and Tuning manual at:

http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.ase_15.0/title.htm

FInd out:

Adaptive Server Enterprise 15.0 > Performance and Tuning: Basics > Data Storage > Pages that manage space allocation

It is more about how to utilize the disk space efficiently and some of the errors happening there doesn't cause any corruption at all.

20120131-EE-VQP-002

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