Checksum Vs Torn Page

Aug 13, 2007

How much of a performance impact will using Cheksum have over Torn Page Detection for Page Verify Recovery? Thanks

Torn Page?

Jan 31, 2007

Hello,
I'm wondering if anyone has any insight as to what happened here. We had a DBCC checkdb error as follows:

Server: Msg 8946, Level 16, State 12, Line 2
Table error: Allocation page (16:3769008) has invalid PFS_PAGE page header values. Type is 0. Check type, object ID and page ID on the page.

So we then ran:
dbcc traceon(3604)
go
dbcc page (<dbname>,16,3769008,1,0)
go
dbcc traceoff(3604)
go

and got:
Server: Msg 8939, Level 16, State 98, Line 1
Table error: Object ID 99, index ID 0, page (16:3769008). Test (IS_ON (BUF_IOERR, bp->bstat) &&bp->berrcode) failed. Values are 2057 and -1.

PAGE: (16:3769008)
------------------

BUFFER:
-------

BUF @0x00FE0640
---------------
bpage = 0x76F22000 bhash = 0x00000000 bpageno = (16:3769008)
bdbid = 6 breferences = 1 bstat = 0x809
bspin = 0 bnext = 0x00000000

PAGE HEADER:
------------

Page @0x76F22000
----------------
m_pageId = (16:3769008) m_headerVersion = 1 m_type = 11
m_typeFlagBits = 0x0 m_level = 0 m_flagBits = 0x0
m_objId = 99 m_indexId = 0 m_prevPage = (0:0)
m_nextPage = (0:0) pminlen = 0 m_slotCnt = 1
m_freeCnt = 2 m_freeData = 8188 m_reservedCnt = 0
m_lsn = (3975:179853:10) m_xactReserved = 0 m_xdesId = (0:0)
m_ghostRecCnt = 0 m_tornBits = 2

Allocation Status
-----------------
GAM (16:3578624) = NOT ALLOCATED
SGAM (16:3578625) = NOT ALLOCATED
PFS (16:3769008) = 0x0 0_PCT_FULL
DIFF (16:3578630) = NOT CHANGED
ML (16:3578631) = NOT MIN_LOGGED

DATA:
-----

Slot 0, Offset 0x4040
---------------------

Row at offset 16448 may be corrupt.
Hex dump of remaining -8258 bytes:

The database is not marked suspect and we have backups to restore, if necessary, but I'm wondering if anyone can interpret what the dbcc commands are telling us and how we can diagnosis what's happening...

Thanks!
Jason

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Torn Page

Nov 2, 2005

Hi all. I'm getting an error mssage which tells me I have a torn page:ODBC error 823 (HY000) I/O error (torn page) detected during read atoffset 0x00000080b5c000 in file 'D:WINSUPPORTDATAWin SupportDatabase_2_Data.NDF'.I ran DBCC CHECKDB and it returned no errors:CHECKDB found 0 allocation errors and 0 consistency errors in database'WIN Support Database'.I really don't know what to do at this point. I'm not a databaseadministrator, just a programmer, and our DBA is not here. Anysuggestions?Thanks,Jennifer

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Torn Page Detection

Sep 14, 2000

Anyone working with databases with this option turned on? How does it affect performance?

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Torn Page Question

Oct 5, 2004

We received the following errors:

1) Error: 823, Severity: 24, State:
2) I/O error (torn page) detected during read at offset 0x0000001455a000..erc

Network team thinks this was caused by low disk space. I was running a database shrink last night, and someone had transferred a file to server prior to my job that took 90% of disk. My shrink job failed and then 20 minutues later we satrted to recieve the two above mentioined.

Can a failed shrink job - which failed due to low disk space cause a torn page to occur? I have not heard of this...

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Torn Page Detection

Jan 7, 2005

Hi, We recently had one of our drives (RAID5) replaced because of failure. This has resulted in a torn page being detected on one of our smaller SQL 2000 databases. We have one or two larger SQL databases (30-70GB) on the same drive amongst several others and are now concerned that we may have a problem with these databases also. (The original torn page only came to light when a query was run on one of the tables). Is there anyway I can run a procedure on each of the databases to find out if we have any problems with torn pages? I obviously don't want to restore the databases as this will take a substantial amount of time that we just don't have at the moment. Any ideas that could put our minds at rest would be much appreciated.
Many thanks.

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Torn Page Error :(

Mar 22, 2006

hi all...
my prod database facing the problem i mention. it show this error when i run some of the query.

Error: 823, Severity: 24, State: 2
I/O error (torn page) detected during read at offset 0x000000ffd0e000 in file 'F:dsUnit'.

i running dbcc checkdb on it. this is the result

DBCC results for 'dsActive3'.
DBCC results for 'sysobjects'.
There are 472 rows in 8 pages for object 'sysobjects'.
DBCC results for 'sysindexes'.
There are 728 rows in 39 pages for object 'sysindexes'.
DBCC results for 'syscolumns'.
There are 4243 rows in 106 pages for object 'syscolumns'.
DBCC results for 'systypes'.
There are 26 rows in 1 pages for object 'systypes'.
DBCC results for 'syscomments'.
There are 281 rows in 66 pages for object 'syscomments'.
DBCC results for 'sysfiles1'.
There are 7 rows in 1 pages for object 'sysfiles1'.
DBCC results for 'syspermissions'.
There are 49 rows in 1 pages for object 'syspermissions'.
DBCC results for 'sysusers'.
There are 13 rows in 1 pages for object 'sysusers'.
DBCC results for 'sysproperties'.
There are 0 rows in 0 pages for object 'sysproperties'.
DBCC results for 'sysdepends'.
There are 2776 rows in 18 pages for object 'sysdepends'.
DBCC results for 'sysreferences'.
There are 26 rows in 1 pages for object 'sysreferences'.
DBCC results for 'sysfulltextcatalogs'.
There are 0 rows in 0 pages for object 'sysfulltextcatalogs'.
DBCC results for 'sysfulltextnotify'.
There are 0 rows in 0 pages for object 'sysfulltextnotify'.
DBCC results for 'sysfilegroups'.
There are 4 rows in 1 pages for object 'sysfilegroups'.
DBCC results for 'INSTRUCTION'.
There are 0 rows in 0 pages for object 'INSTRUCTION'.
DBCC results for 'DATASWEEP_CODES'.
There are 180 rows in 4 pages for object 'DATASWEEP_CODES'.
DBCC results for 'DATASWEEP_SEQUENCE'.
There are 7 rows in 1 pages for object 'DATASWEEP_SEQUENCE'.
DBCC results for 'OPERATION'.
There are 52 rows in 1 pages for object 'OPERATION'.
DBCC results for 'Results'.
There are 2 rows in 1 pages for object 'Results'.
DBCC results for 'DC_BLOB'.
There are 8 rows in 1 pages for object 'DC_BLOB'.
DBCC results for 'PRODUCTION_LINE'.
There are 2 rows in 1 pages for object 'PRODUCTION_LINE'.
DBCC results for 'DS_PERSISTENT_OBJECT'.
There are 5 rows in 1 pages for object 'DS_PERSISTENT_OBJECT'.
DBCC results for 'EQUIPMENT'.
There are 0 rows in 0 pages for object 'EQUIPMENT'.
DBCC results for 'RESOURCE_CONDITION'.
There are 2 rows in 1 pages for object 'RESOURCE_CONDITION'.
DBCC results for 'IMAGE_BLOB'.
There are 0 rows in 0 pages for object 'IMAGE_BLOB'.
DBCC results for 'ROUTE'.
There are 125 rows in 2 pages for object 'ROUTE'.
DBCC results for 'JOB_CONFIG'.
There are 19 rows in 1 pages for object 'JOB_CONFIG'.
DBCC results for 'UNIT_CHECKLIST'.
There are 0 rows in 0 pages for object 'UNIT_CHECKLIST'.
DBCC results for 'JOB_SCHEDULE'.
There are 10 rows in 1 pages for object 'JOB_SCHEDULE'.
DBCC results for 'LOCATION'.
There are 1 rows in 1 pages for object 'LOCATION'.
DBCC results for 'WORK_ORDER_ITEMS'.
There are 4375 rows in 139 pages for object 'WORK_ORDER_ITEMS'.
DBCC results for 'NOTE_BLOB'.
There are 0 rows in 0 pages for object 'NOTE_BLOB'.
DBCC results for 'ROUTE_STEP'.
There are 599 rows in 13 pages for object 'ROUTE_STEP'.
DBCC results for 'PART'.
There are 1827 rows in 69 pages for object 'PART'.
Server: Msg 8928, Level 16, State 1, Line 1
Object ID 475148738, index ID 0: Page (5:610106) could not be processed. See other errors for details.
Server: Msg 8939, Level 16, State 1, Line 1
Table error: Object ID 475148738, index ID 0, page (5:610106). Test (IS_ON (BUF_IOERR, bp->bstat) &&bp->berrcode) failed. Values are 2057 and -1.
Server: Msg 8928, Level 16, State 1, Line 1
Object ID 475148738, index ID 0: Page (5:610107) could not be processed. See other errors for details.
Server: Msg 8939, Level 16, State 1, Line 1
Table error: Object ID 475148738, index ID 0, page (5:610107). Test (IS_ON (BUF_IOERR, bp->bstat) &&bp->berrcode) failed. Values are 2057 and -1.
Server: Msg 8928, Level 16, State 1, Line 1
Object ID 475148738, index ID 0: Page (5:610165) could not be processed. See other errors for details.
Server: Msg 8939, Level 16, State 1, Line 1
Table error: Object ID 475148738, index ID 0, page (5:610165). Test (IS_ON (BUF_IOERR, bp->bstat) &&bp->berrcode) failed. Values are 2057 and -1.
Server: Msg 8928, Level 16, State 1, Line 1
Object ID 475148738, index ID 0: Page (5:610166) could not be processed. See other errors for details.
Server: Msg 8935, Level 16, State 1, Line 1
Table error: Object ID 475148738, index ID 1. The previous link (5:611693) on page (5:610224) does not match the previous page (5:610106) that the parent (5:614865), slot 80 expects for this page.
DBCC results for 'DS_TABLESPACE_MAP'.
There are 6 rows in 1 pages for object 'DS_TABLESPACE_MAP'.
DBCC results for 'BOM_PART_LIST'.
There are 9927 rows in 196 pages for object 'BOM_PART_LIST'.
DBCC results for 'SITE_INFO'.
There are 1 rows in 1 pages for object 'SITE_INFO'.
DBCC results for 'RESOURCE_ARC'.
There are 2 rows in 1 pages for object 'RESOURCE_ARC'.
DBCC results for 'CARRIER_COMPARTMENT'.
There are 0 rows in 0 pages for object 'CARRIER_COMPARTMENT'.
DBCC results for 'RESOURCE_QUEUE'.
There are 2 rows in 1 pages for object 'RESOURCE_QUEUE'.
DBCC results for 'TRX_BASE'.
Server: Msg 8936, Level 16, State 1, Line 1
Table error: Object ID 475148738, index ID 1. B-tree chain linkage mismatch. (5:610618)->next = (5:610224), but (5:610224)->Prev = (5:611693).
Server: Msg 8981, Level 16, State 1, Line 1
Table error: Object ID 475148738, index ID 1. The next pointer of (5:610619) refers to page (5:610343). Neither (5:610343) nor its parent were encountered. Possible bad chain linkage.
Server: Msg 8934, Level 16, State 1, Line 1
Table error: Object ID 475148738, index ID 1. The high key value on page (5:610616) (level 0) is not less than the low key value in the parent (0:1), slot 0 of the next page (5:610618).
Server: Msg 8935, Level 16, State 1, Line 1
Table error: Object ID 475148738, index ID 1. The previous link (5:611693) on page (5:610618) does not match the previous page (5:610616) that the parent (5:614865), slot 94 expects for this page.
Server: Msg 8936, Level 16, State 1, Line 1
Table error: Object ID 475148738, index ID 1. B-tree chain linkage mismatch. (5:610616)->next = (5:610618), but (5:610618)->Prev = (5:611693).
Server: Msg 8935, Level 16, State 1, Line 1
Table error: Object ID 475148738, index ID 1. The previous link (5:611693) on page (5:610619) does not match the previous page (5:610618) that the parent (5:614865), slot 95 expects for this page.
Server: Msg 8978, Level 16, State 1, Line 1
Table error: Object ID 475148738, index ID 1. Page (5:610619) is missing a reference from previous page (5:611693). Possible chain linkage problem.
Server: Msg 8935, Level 16, State 1, Line 1
Table error: Object ID 475148738, index ID 1. The previous link (5:611693) on page (5:610620) does not match the previous page (5:610619) that the parent (5:614865), slot 96 expects for this page.
Server: Msg 8978, Level 16, State 1, Line 1
Table error: Object ID 475148738, index ID 1. Page (5:610620) is missing a reference from previous page (5:611693). Possible chain linkage problem.
Server: Msg 8978, Level 16, State 1, Line 1
Table error: Object ID 475148738, index ID 1. Page (5:610622) is missing a reference from previous page (5:610620). Possible chain linkage problem.
Server: Msg 8928, Level 16, State 1, Line 1
Object ID 587149137, index ID 0: Page (4:523911) could not be processed. See other errors for details.
Server: Msg 8939, Level 16, State 1, Line 1
Table error: Object ID 587149137, index ID 0, page (4:523911). Test (IS_ON (BUF_IOERR, bp->bstat) &&bp->berrcode) failed. Values are 2057 and -1.
There are 67236767 rows in 2321938 pages for object 'TRX_BASE'.
CHECKDB found 0 allocation errors and 18 consistency errors in table 'TRX_BASE' (object ID 475148738).
DBCC results for 'CHECKLIST_ITEM'.
There are 0 rows in 0 pages for object 'CHECKLIST_ITEM'.
DBCC results for 'DCS_LIST'.
There are 0 rows in 0 pages for object 'DCS_LIST'.
DBCC results for 'DCS_PARM'.
There are 253 rows in 7 pages for object 'DCS_PARM'.
DBCC results for 'RESOURCE_QUEUE_LINK'.
There are 2 rows in 1 pages for object 'RESOURCE_QUEUE_LINK'.
DBCC results for 'RESOURCE_ROUTE'.
There are 1 rows in 1 pages for object 'RESOURCE_ROUTE'.
DBCC results for 'DS_OBJECT_BLOB'.
There are 45 rows in 1 pages for object 'DS_OBJECT_BLOB'.
DBCC results for 'TEST_INSTANCE'.
There are 5836487 rows in 159046 pages for object 'TEST_INSTANCE'.
DBCC results for 'FORM_BLOB'.
There are 647 rows in 4 pages for object 'FORM_BLOB'.
DBCC results for 'ROUTE_ARC'.
There are 1047 rows in 9 pages for object 'ROUTE_ARC'.
DBCC results for 'UNIT'.
There are 5139230 rows in 309518 pages for object 'UNIT'.
CHECKDB found 0 allocation errors and 2 consistency errors in table 'UNIT' (object ID 587149137).
DBCC results for 'INSTRUCTION_BLOB'.
There are 0 rows in 0 pages for object 'INSTRUCTION_BLOB'.
DBCC results for 'ROUTE_QUEUE'.
There are 599 rows in 5 pages for object 'ROUTE_QUEUE'.
DBCC results for 'INSTRUCTION_LIST'.
There are 0 rows in 0 pages for object 'INSTRUCTION_LIST'.
DBCC results for 'LOT'.
There are 313 rows in 12 pages for object 'LOT'.
DBCC results for 'ROUTE_QUEUE_LINK'.
There are 599 rows in 9 pages for object 'ROUTE_QUEUE_LINK'.
DBCC results for 'SCHEMA_VERSION'.
There are 2 rows in 1 pages for object 'SCHEMA_VERSION'.
DBCC results for 'PRODUCT_ROUTE_P_LINE_REL'.
There are 0 rows in 0 pages for object 'PRODUCT_ROUTE_P_LINE_REL'.
DBCC results for 'SERIAL_NUMBER'.
There are 1 rows in 1 pages for object 'SERIAL_NUMBER'.
DBCC results for 'PRODUCT_RS_WC_REL'.
There are 0 rows in 0 pages for object 'PRODUCT_RS_WC_REL'.
DBCC results for 'RESOURCE_STEP'.
There are 2 rows in 1 pages for object 'RESOURCE_STEP'.
DBCC results for 'STATION'.
There are 53 rows in 1 pages for object 'STATION'.
DBCC results for 'SUBROUTINE_BLOB'.
There are 354 rows in 2 pages for object 'SUBROUTINE_BLOB'.
DBCC results for 'TMPL_TBOM'.
There are 2 rows in 1 pages for object 'TMPL_TBOM'.
DBCC results for 'TBOM_PART_LIST'.
There are 0 rows in 0 pages for object 'TBOM_PART_LIST'.
DBCC results for 'TMPL_TBOM_PART_LIST'.
There are 0 rows in 0 pages for object 'TMPL_TBOM_PART_LIST'.
DBCC results for 'TRX_CARRIER'.
There are 0 rows in 0 pages for object 'TRX_CARRIER'.
DBCC results for 'TRACKED_OBJECT_HISTORY'.
There are 18576505 rows in 922365 pages for object 'TRACKED_OBJECT_HISTORY'.
DBCC results for 'TRX_CONSUMPTION'.
There are 0 rows in 0 pages for object 'TRX_CONSUMPTION'.
DBCC results for 'TRACKED_OBJECT_STATUS'.
There are 5461496 rows in 587509 pages for object 'TRACKED_OBJECT_STATUS'.
DBCC results for 'TRX_GENEALOGY'.
There are 0 rows in 0 pages for object 'TRX_GENEALOGY'.
DBCC results for 'XFR_DELETION_LOG'.
There are 21699 rows in 279 pages for object 'XFR_DELETION_LOG'.
DBCC results for 'UNIT_CHECKLIST_ITEM'.
There are 0 rows in 0 pages for object 'UNIT_CHECKLIST_ITEM'.
DBCC results for 'XFR_EXTRACT_LOG'.
There are 7150 rows in 289 pages for object 'XFR_EXTRACT_LOG'.
DBCC results for 'DS_LIST_ITEM'.
There are 800 rows in 11 pages for object 'DS_LIST_ITEM'.
DBCC results for 'HIERARCHY_LEVEL'.
There are 10 rows in 5 pages for object 'HIERARCHY_LEVEL'.
DBCC results for 'XFR_LOAD_LOG'.
There are 0 rows in 0 pages for object 'XFR_LOAD_LOG'.
DBCC results for 'XFR_SCHEMA_OBJECT'.
There are 87 rows in 2 pages for object 'XFR_SCHEMA_OBJECT'.
DBCC results for 'XFR_UPDATE_RELATIONSHIPS'.
There are 37 rows in 1 pages for object 'XFR_UPDATE_RELATIONSHIPS'.
DBCC results for 'BOX'.
There are 305676 rows in 7968 pages for object 'BOX'.
DBCC results for 'USER_SEQUENCE'.
There are 0 rows in 0 pages for object 'USER_SEQUENCE'.
DBCC results for 'DC_dst_CorrectiveAction'.
There are 0 rows in 0 pages for object 'DC_dst_CorrectiveAction'.
DBCC results for 'ACCOUNT'.
There are 1 rows in 1 pages for object 'ACCOUNT'.
DBCC results for 'DC_dst_ShiftDefinition'.
There are 0 rows in 0 pages for object 'DC_dst_ShiftDefinition'.
DBCC results for 'DC_dst_5DX'.
There are 0 rows in 0 pages for object 'DC_dst_5DX'.
DBCC results for 'XFR_INTERVAL_ID'.
There are 10327 rows in 27 pages for object 'XFR_INTERVAL_ID'.
DBCC results for 'DC_dst_ComponentLocation'.
There are 0 rows in 0 pages for object 'DC_dst_ComponentLocation'.
DBCC results for 'PROCESS_CONTROL'.
There are 0 rows in 0 pages for object 'PROCESS_CONTROL'.
DBCC results for 'DC_dst_Account'.
There are 0 rows in 0 pages for object 'DC_dst_Account'.
DBCC results for 'REFERENCE_DESIGNATOR'.
There are 9927 rows in 51 pages for object 'REFERENCE_DESIGNATOR'.
DBCC results for 'DC_dst_PasteMeasurement'.
There are 0 rows in 0 pages for object 'DC_dst_PasteMeasurement'.
DBCC results for 'TEST_DEFINITION'.
There are 4 rows in 1 pages for object 'TEST_DEFINITION'.
DBCC results for 'DC_dst_ReportActionLog'.
There are 0 rows in 0 pages for object 'DC_dst_ReportActionLog'.
DBCC results for 'DC_dst_CAR_NCR'.
There are 0 rows in 0 pages for object 'DC_dst_CAR_NCR'.
DBCC results for 'TEST_RESULT'.
There are 10376737 rows in 199778 pages for object 'TEST_RESULT'.
DBCC results for 'DC_dst_NonConObject'.
There are 0 rows in 0 pages for object 'DC_dst_NonConObject'.
DBCC results for 'DEFECT_REPAIR_ENTRY'.
There are 3240433 rows in 169991 pages for object 'DEFECT_REPAIR_ENTRY'.
DBCC results for 'DC_dstr_UserFormAndReports'.
There are 4 rows in 1 pages for object 'DC_dstr_UserFormAndReports'.
DBCC results for 'SITE_CONFIG'.
There are 1 rows in 1 pages for object 'SITE_CONFIG'.
DBCC results for 'DC_dst_NonConformance'.
There are 0 rows in 0 pages for object 'DC_dst_NonConformance'.
DBCC results for 'BOM'.
There are 173 rows in 4 pages for object 'BOM'.
DBCC results for 'DC_dstr_GroupSecurity'.
There are 1 rows in 1 pages for object 'DC_dstr_GroupSecurity'.
DBCC results for 'DC_dst_RMA_SerialNumber'.
There are 82197 rows in 7129 pages for object 'DC_dst_RMA_SerialNumber'.
DBCC results for 'SUBROUTINE'.
There are 354 rows in 10 pages for object 'SUBROUTINE'.
DBCC results for 'DC_dst_DPMO_Information'.
There are 0 rows in 0 pages for object 'DC_dst_DPMO_Information'.
DBCC results for 'TBOM'.
There are 5139874 rows in 64048 pages for object 'TBOM'.
DBCC results for 'DC_dst_LineSchedule'.
There are 0 rows in 0 pages for object 'DC_dst_LineSchedule'.
DBCC results for 'DC_dst_ECO_Details'.
There are 0 rows in 0 pages for object 'DC_dst_ECO_Details'.
DBCC results for 'HN_dst_PartDimension'.
There are 1053 rows in 19 pages for object 'HN_dst_PartDimension'.
DBCC results for 'DC_dst_ECO_Header'.
There are 0 rows in 0 pages for object 'DC_dst_ECO_Header'.
DBCC results for 'WORK_CENTER'.
There are 0 rows in 0 pages for object 'WORK_CENTER'.
DBCC results for 'ICT_Tester_Name'.
There are 39 rows in 1 pages for object 'ICT_Tester_Name'.
DBCC results for 'WORK_ORDER'.
There are 4397 rows in 164 pages for object 'WORK_ORDER'.
DBCC results for 'DS_LIST'.
There are 72 rows in 2 pages for object 'DS_LIST'.
DBCC results for 'HN_dst_StationDimension'.
There are 1 rows in 1 pages for object 'HN_dst_StationDimension'.
DBCC results for 'HIERARCHY'.
There are 2 rows in 1 pages for object 'HIERARCHY'.
DBCC results for 'CARRIER'.
There are 0 rows in 0 pages for object 'CARRIER'.
DBCC results for 'CHECKLIST'.
There are 1 rows in 1 pages for object 'CHECKLIST'.
DBCC results for 'DBPS'.
There are 1 rows in 1 pages for object 'DBPS'.
DBCC results for 'DCS'.
There are 17 rows in 1 pages for object 'DCS'.
DBCC results for 'APP_USER'.
There are 2078 rows in 197 pages for object 'APP_USER'.
DBCC results for 'DS_OBJECT'.
There are 45 rows in 2 pages for object 'DS_OBJECT'.
DBCC results for 'dtproperties'.
There are 0 rows in 0 pages for object 'dtproperties'.
DBCC results for 'CHECKOUT_ITEM'.
There are 0 rows in 0 pages for object 'CHECKOUT_ITEM'.
DBCC results for 'FORM'.
There are 647 rows in 15 pages for object 'FORM'.
DBCC results for 'CONSUMED_PART'.
There are 0 rows in 0 pages for object 'CONSUMED_PART'.
CHECKDB found 0 allocation errors and 20 consistency errors in database 'dsActive3'.
repair_allow_data_loss is the minimum repair level for the errors found by DBCC CHECKDB (dsActive3 ).
DBCC execution completed. If DBCC printed error messages, contact your system administrator.

now the main problem is when i restore the latest backup i have. it also facing the problem. the other backup i got is one more week older than this.

can anyone help me? i cant affort to has 2 week data loss

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Torn Page Detection

May 22, 2007

I want to switch this setting off on all db's - that's easy.

But I presume that means the problem could occur without me knowing for weeks (maybe due to a defective disk driver). So is there a way I can schedule a maintainance task that will check for this problem out of hours? (Maybe by switching the DB option on for a while and then back off? If you switch the option on, does it check the whole database? Or does it just do checks during the actual update?) Hopefully there is a better way than that to do it...

Also, am I right in saying that CHECKSUM is new to 2005?
And what do you guys use: Checksum, Torn Page Detection or None?

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Torn Page Problem

Feb 16, 2006

HiWhen trying to create an SqlServer job, clicking OK' I got the message"Error 823: I/O error (torn page) detected during read at offset..... infile 'd:sqlserverMSSQLdatamsdata.mdf'. The job was not saved"I asked about the problem a little to find out that I need to restore abackup of MSdb because the job definitions are there. I rrad some otherplace (I can't remember where) that in order to restore MSdb I need torestore a backup of Master as well.Can anyone give me some more information on this.Is there any way else to do it besides restoring the backup ?To restore, do I need to recreate the database or just restore theappropiate backup file ?David Greenberg

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Err. 823 Torn Page Detected

Jul 20, 2005

Hi all,One of my database was suspected, So I try to recover database then itgives this errorErr. 823 Torn Page Detected823, ... 24, spid51 i/o error Torn Page (Detected)during read at offset 0x0000000040e0000 in file .........How can I recover my SQL Server 2000 Database? Please helpThanks

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Repair Torn Page?

Jul 20, 2005

I have inherited a poorly administered/maintained database thatcontains the following error:"I/O error (torn page) detected during read at offset 0x000018ee23e000in file 'F:Program FilesISSRealSecure SiteProtectorSiteDatabaseDataRealSecureDB.mdf"I do not have database backups and so therefore cannot restore fromthem. I want to move the database to a new platform and somehowrepair the torn page. Is this possible?

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Turning Torn Page Detection ON

May 7, 2007

Are there any issues turning this ON?

I have inherited a database which started life under SQL 7 (where Torn page Detection was OFF by default), and I'd like to turn it on. Will this reshuffle all the pages to make room for the extra check-sum, or is that stored in a single block somewhere else such that it can easily be added?

Is the change going to block access for long? (DB = between 2~5GB)

Thanks

Kristen

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Page Checksum

Jan 24, 2008

Hi,

I heard that page checksum enabled will reports errors occured in the log. That's good.

Currently we have DBCC PHYSICAL_ONLY run alone and CHECKTABLE on group of tables on different days. A suggestion came from a person is to turn off 'DBCC CHECK TABLE' and run only when checksum reports an error and continue running CHECKDB WITH PHYSICAL_ONLY as before.

Is this suggestion a best practice? Please also write few lines to say why it is wrong or wright.

Thanks and best regards

Priw

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I/O Error (torn Page) Detected During Read

Mar 31, 2008

we are running a maintainance plan on sql 2000 standard edition, got the error,

[2] Database db_source: Check Data Linkage...
[Microsoft SQL-DMO (ODBC SQLState: 42000)] Error 8928: [Microsoft][ODBC SQL Server Driver][SQL Server]Object ID 1221579390, index ID 0: Page (1:197116) could not be processed. See other errors for details.
[Microsoft][ODBC SQL Server Driver][SQL Server]Table error: Object ID 1221579390, index ID 0, page (1:197116).
Test (IS_ON (BUF_IOERR, bp->bstat) &&bp->berrcode) failed. Values are 2057 and -1.
[Microsoft][ODBC SQL Server Driver][SQL Server]CHECKDB found 0 allocation errors and 2 consistency errors in table 'xxx'(object ID 1221579390).
[Microsoft][ODBC SQL Server Driver][SQL Server]CHECKDB found 0 allocation errors and 2 consistency errors in database 'db_source'.
[Microsoft][ODBC SQL Server Driver][SQL Server]repair_allow_data_loss is the minimum repair level for the errors found by DBCC CHECKDB (db_source noindex).

when i run query on anlyzer select * from xxx, i got the error
Server: Msg 823, Level 24, State 2, Line 1
I/O error (torn page) detected during read at offset 0x000000603f8000 in file 'F:Program FilesMicrosoft SQL ServerMSSQLdatadb_Data.MDF'.

Connection Broken

please help. thanks

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How To Repair Torn Page On SQL Data File?

Jul 20, 2005

I got help from Dan Guzman on how to set single-user-mode.Thank you very much.After seting single-user-mode, I run DBCC CHECKDB('MYDATABASE',REPAIR_REBUILD)Tehre are error messages.How can I repair torn page problem?Thanks.*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!

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Torn Page Detection And Auto Shrink: Performance?

Feb 16, 2006

Hello everybody,First: SQL Server 2000 sp3a, HP cluster server, MS 2003 server,database recovery model simpleTorn page detection:When I have this option turned on, processes conected with updating andwriting in database, was MUCH more slower, than if I've this optionturned off.It seams to me, that when this option is turned on, the sqlserver ismuch more slower by any operation connected with writing, than withoutthis option.This option is required for ensurance, that the data are writtenproperly on the media.My question is:if I have my database running under cluster, with RAID hd system, whichcontains write cache, with additional checking, that the data will bewritten correctly, is it necessary for me to keep this option turnedon?Auto shrink:When it is turned on, does it affect performance?Personaly, I don't think so, but somebody is insysting on it, and Iwould like to have an information from independent source about that.Best regardsMatik

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Checksum Task Vs T-sql Checksum

Feb 29, 2008

do you have to store the checksum from the task in order to verify change? Here is what I did and it seems it's not going to work

Lookup transformation that
selects matching fields and returns a t-sql with the binary_checksum(fields)

Checksum transformation returns the checksum of same inbound fields

conditional split passes on changed records to the update

getting all the records everytime and should not be happening.

is there a way to make this work or do I have to store the checksum

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Experience With Torn Pages?

May 15, 2002

Does anyone have any experience detecting and repairing torn pages? Does Optimization repair Torn Pages ? Any help or resources would be much appriciated.

Late
Matt

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Checksum

Jun 11, 2008

Hi
What is the purpose of checksum function???

RKNAIR

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Reporting Services :: All Record Are Displaying On One Page - How To Display Page By Page

Nov 11, 2015

I have created one reports but all the records are displaying on one page.find a solution to display the records page by page. I created the same report without group so the records are displaying in page by page.

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Binary Checksum

Feb 6, 2004

Hi,

Can anyone provide me with the syntax for comparing rows of two tables using binary checksum? The tables A and B have 8 & 9 columns respectively. The PK in both cases is Col1 & Col2. I want checksum on Columns 1 to 8.

Thanks

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Checksum Computation Help

Feb 6, 2004

Please execute the script below to understand the problem -

---
create table test(id int, col1 int,col2 varchar(5),col3 datetime)
create table test2(id int, col1 int,col2 varchar(5),col3 datetime)

--id & col1 make up the PK.

insert test values(4,4,'d','02/06/2004')
insert test values(4,4,'e','02/06/2004')

insert test2 values(4,4,'d','02/06/2004')
insert test2 values(4,4,'e','02/06/2004')

select *
from test

select *
from test2

--The rows are identical.
--Script A

select t.*
from test t
join test2 t2 on t2.id=t.id
where CHECKSUM(t.col2,t.col3)<>CHECKSUM(t2.col2,t2.col3)

--The purpose of the above script is to check for any updates in the two tables. It returns two rows. But as you can see both these rows were present in the table before. So I modify the script to -
--SCRIPT B
select t.*
from test t
join test2 t2 on t2.col2=t.col2
where CHECKSUM(t.col3)<>CHECKSUM(t2.col3)

-- In this case no row is returned.This is exactly what I need. The problem - Now execute the script below.

TRUNCATE TABLE TEST
TRUNCATE TABLE TEST2

insert test values(4,4,'d','02/06/2004')
insert test values(4,4,'d','02/01/2004')

insert test2 values(4,4,'d','02/06/2004')
insert test2 values(4,4,'d','02/01/2004')

--Now when I execute script B two rows are returned which is not what I want. Since the rows are identical no row should be returned. So depending on what column changes (col2 or col3), I have to alter the script. I seek advise on the method to calculate checksum. Again the PK is ID and Col1 only.

Thanks

drop table test
drop table test2
go
--

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CHECKSUM Function

Jun 7, 2006

Hello All,
How to use CHECKSUM function and how it is useful?
Thanks
Sanjeev

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Checksum Not Working

Jul 23, 2005

I'm developing a stored procedure to run an update based on valuesentered into a .Net web form. I want to capture the chceksum of therow when it is displayed on the form then validate that when the updateis exec'd. Simple enough logic, eh? The problem is when I try to usethe checksum(*) function, SQL server yells at me and says that it isn'trecognized. I'm using SQL Server 7, so wtf? I am not the admin of theserver and I'm skirting around SQL Server Enterprise Manager and usingany free utils, MS Access, and Visual Studio to maintain this db.ThanksAlex Jamrozek

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What Do You Think About The Checksum Function ?

May 29, 2007

Hi,I'd like advices about an idea I add to resolve a problem. thanks toyou in advance for yours answers.I have a database with tables that I load with flat file. The size ofeach table is 600 Mb. The flat file are the image of an applicationand there is no updated date or created date on any table. So mytables are just a copy of the data from the flat file.Now I'd like to create an History Table. So I have to determine whichlines changed and which one did'nt.As I don't have any date on my row the only answer I had unil know wasto check each column on each row to see if any data changed. If thedata changed I add a new line in my history date.My idea is to add a checksum column in both table on all columns. Toknow if any data change I just have to check my PK + my checksumcolumn.Do you think that is a good idea ? Is checksum a quick function ornot ?.Thanks.--K

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CHECKSUM && CHECKSUM_AGG In T-SQL

Sep 24, 2007

Hi,

I recently researched on the CHECKSUM & CHECKSUM_AGG functions in T-Sql and found them really useful. However, I was skeptical that there are chances of these functions returning the same values for non-identical inputs. I just got on to the forums and found more than one unhappy folks writing about their experience with these functions.

I am designing a large database (warehouse) and found these functions tempting to implement for the sake of

using CHECKSUM for

- indexing long character fields
- multiple colums of the same table that would involve in a join and use the new checksum field instead

using CHECKSUM_AGG for

- I bulkcopy flat file soruce data into a character field of a table and to ensure that I am not loading the same file multiple times, I plan to use CHECKSUM_AGG( CHECKSUM( [FlatFileRecord] ) ) and verify that no two loads have the same output.

Can some body suggest if I can trust these methods for my purpose?

Many thanks in advance!!

Thanks,
Harish

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Checksum Storage

Feb 18, 2008

it sounds like a column can be added to each row in a table that is the checksum or binary_checksum of an expression. How many bytes do each of these occupy? Does the answer depend on the number and/or length of items in the expression?

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HELP NEEDED FOR CHECKSUM

Dec 18, 2007

Hi:

i am using checksum in my etl process for this i have a checksum field to calculate the values in my table
the column is a computed column and it has a property for persistence .

what decision should i take should i make it persisted ot not what is the industry standard.

Can you please expalin how this property would affect the behaviour of the column

will this property affect me in any thing like indexes . please let me what step should i take should i make the column persisted or not .

Please let me know.

Thanks,

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Need Help With Checksum Procedure

May 11, 2006

Morning Campers,

I have two tables src_monthly_terrrier and src_weekly_terrier. Both of these tables consists of 10+ columns. As the table names probably suggest, I import weekly data into one and monthly data into another.

All the source data comes from an Excel spreadsheet via straight Import Data procedure. The only guaranteed change on a weekly and monthly basis is that one of the columns in each table named src_date will obviously have the data value for whichever month or week's data it relates to.

I understand that through 'SQL Server Business Intelligence Development Studio' I can create an 'Intergrated Services' package that will import the spreadsheet details for me. I might be going the long way around this, but it was my intention to bring in all the data and then run a couple of 'INSERT INTO' Stored Procedures.

My biggest issue / vunerability I have is that there is no error checking of the data on the way in to ensure that it has not already been imported. What I was thinking I could do to resolve this was to create a Checksum field comprising of a number of different columns (incl src_date) and then somehow write something that will look at the values of each intended imported row and then work out whether a duplicate checksum was found in the target table and then rejected the import routine as Duplicate Data Found (or something similar) and move onto the next stored procedure.

My problem is two fold, one I have no idea how to create said checksum and two no idea where to begin on coding a procedure etc that looks to see if the value already exists etc etc.

I have looked up checksum creation on the net and there appears to be plenty of resource to explain how to create one, so I guess my main question is, Where do I start when it comes to writing some code that will do the check of the checksum before the importation routine begins (or at least the Insert Into procedures.

I would truly appreciate anyone's help on this. In the meanwhile I am off to learn how to create them.

I would like to add, if anyone sees this as a bad idea, then please speak up.

Thanks in Advance

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CHECKSUM() Of Binary Data

Mar 19, 2004

Hello,

I need to generate HASH of text values for my app. I can generate hash values for normal fields using CHEKCSUM and BINARY_CHECKSUM function but it does not support checksum of text, ntext, image, and cursor, as well as sql_variant.

How can I generate checksums of such datatype.

Karam

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SQL Server 2008 :: What Is The Use Of Checksum

Feb 11, 2015

what is the use of check sum in sql server:

ex: RESTORE DATABASE [XXX] FROM DISK = 'XX.BAK' with check sum

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Backup With CHECKSUM Operation...

Mar 13, 2007

Looking for some clarification on the CHECKSUM option of the BACKUP command.

If the the CHECKSUM option is specified in the backup, will the backup fail if CHECKSUM finds bad values (or at least raise an error)? Or, is it only reported when doing a RESTORE VERIFYONLY?

Thank you.

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CHECKSUM Replacement For IMAGE And TEXT

Aug 22, 2006

With this discussion here http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=70328
I started to thinkn about Microsoft really calculated checksum value.

This code is 100% compatible with MS original. That is, the result is identical.
You can use it "as is", or you can use it to see that MS function does not produce that unique values one could expect.

With text/varchar/image data, call with SELECT BINARY_CHECKSUM('abcdefghijklmnop'), dbo.fnPesoBinaryChecksum('abcdefghijklmnop')
With integer data, call with SELECT BINARY_CHECKSUM(123), dbo.fnPesoBinaryChecksum(CAST(123 AS VARBINARY))
I haven't figured out how to calculate checksum for integers greater than 255 yet.CREATE FUNCTION dbo.fnPesoBinaryChecksum
(
@Data IMAGE
)
RETURNS INT
AS

BEGIN
DECLARE@Index INT,
@MaxIndex INT,
@SUM BIGINT,
@Overflow TINYINT

SELECT@Index = 1,
@MaxIndex = DATALENGTH(@Data),
@SUM = 0

WHILE @Index <= @MaxIndex
SELECT@SUM = (16 * @SUM) ^ SUBSTRING(@Data, @Index, 1),
@Overflow = @SUM / 4294967296,
@SUM = @SUM - @Overflow * 4294967296,
@SUM = @SUM ^ @Overflow,
@Index = @Index + 1

IF @SUM > 2147483647
SELECT @SUM = @SUM - 4294967296

RETURN @SUM
ENDActually this is an improvement of MS function, since it accepts TEXT and IMAGE data.CREATE FUNCTION dbo.fnPesoTextChecksum
(
@Data TEXT
)
RETURNS INT
AS

BEGIN
DECLARE@Index INT,
@MaxIndex INT,
@SUM BIGINT,
@Overflow TINYINT

SELECT@Index = 1,
@MaxIndex = DATALENGTH(@Data),
@SUM = 0

WHILE @Index <= @MaxIndex
SELECT@SUM = (16 * @SUM) ^ ASCII(SUBSTRING(@Data, @Index, 1)),
@Overflow = @SUM / 4294967296,
@SUM = @SUM - @Overflow * 4294967296,
@SUM = @SUM ^ @Overflow,
@Index = @Index + 1

IF @SUM > 2147483647
SELECT @SUM = @SUM - 4294967296

RETURN @SUM
END
Peter Larsson
Helsingborg, Sweden

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