What is the cause or why do we get allocation error

  • Hi All,

    After running a DBCC CHECKDB On one of our database. I got below error.

    Extent (36:16) in database ID 5 is allocated by more than one allocation object.

    Msg 8913, Level 16, State 1, Line 1

    Extent (36:16) is allocated to 'GAM' and at least one other object.

    Is it some thing related to IO operation?

    Not able to understand why this error has come.

    Can somebody put some light on this.

    Thanks in advance

  • Small chance, bug in SQL, large chance IO subsystem error, same as all other corruption.

    Can't give you any advice on fixing it without seeing all of the output from CheckDB.

    Gail Shaw
    Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
    SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

    We walk in the dark places no others will enter
    We stand on the bridge and no one may pass
  • Thanks for a quick reply

    Here is more detail of DBCC.

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Page (36:16) was not seen in the scan although its parent (38:4256353) and previous (37:4258279) refer to it. Check any previous errors.

    Msg 8980, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Index node page (38:4256353), slot 83 refers to child page (36:17) and previous child (36:16), but they were not encountered.

    Msg 8980, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Index node page (38:4256353), slot 84 refers to child page (36:18) and previous child (36:17), but they were not encountered.

    Msg 8980, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Index node page (38:4256353), slot 85 refers to child page (36:19) and previous child (36:18), but they were not encountered.

    Msg 8980, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Index node page (38:4256353), slot 86 refers to child page (36:20) and previous child (36:19), but they were not encountered.

    Msg 8980, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Index node page (38:4256353), slot 87 refers to child page (36:21) and previous child (36:20), but they were not encountered.

    Msg 8980, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Index node page (38:4256353), slot 88 refers to child page (36:22) and previous child (36:21), but they were not encountered.

    Msg 8980, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Index node page (38:4256353), slot 89 refers to child page (36:23) and previous child (36:22), but they were not encountered.

    Msg 8978, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Page (38:4259448) is missing a reference from previous page (36:23). Possible chain linkage problem.

    There are 329342272 rows in 7631236 pages for object "XXXX".

    CHECKDB found 1 allocation errors and 9 consistency errors in table

    CHECKDB found 3 allocation errors and 9 consistency errors in database XXXXX.

    repair_allow_data_loss is the minimum repair level for the errors found by DBCC CHECKDB (XXXXX)

    Can please help to me understand what this mean.

  • That is not the entire output of checkDB. Please run the following and post the full and complete output.

    DBCC CHECKDB (<Database Name>) WITH NO_INFOMSGS, ALL_ERRORMSGS

    Gail Shaw
    Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
    SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

    We walk in the dark places no others will enter
    We stand on the bridge and no one may pass
  • Yes its not the full output. But rest of the tables in that DB, the dbcc out is alright there is no such error message. There was only one table which was the cause for this error output

    I posted only error part of it. I hope it will help.

    Thanks

  • There are two allocation errors that you haven't posted. Please run the command I gave you (which will return only the errors) and post the results

    Gail Shaw
    Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
    SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

    We walk in the dark places no others will enter
    We stand on the bridge and no one may pass
  • I appriciate your effort and quick responses.

    Here I am posting the full output of DBCC CheckDB. Just the User Table name are edited.

    DBCC results for 'XXXXX'.

    Service Broker Msg 9675, State 1: Message Types analyzed: 14.

    Service Broker Msg 9676, State 1: Service Contracts analyzed: 6.

    Service Broker Msg 9667, State 1: Services analyzed: 3.

    Service Broker Msg 9668, State 1: Service Queues analyzed: 3.

    Service Broker Msg 9669, State 1: Conversation Endpoints analyzed: 0.

    Service Broker Msg 9674, State 1: Conversation Groups analyzed: 0.

    Service Broker Msg 9670, State 1: Remote Service Bindings analyzed: 0.

    Service Broker Msg 9605, State 1: Conversation Priorities analyzed: 0.

    Msg 8904, Level 16, State 1, Line 1

    Extent (36:16) in database ID 5 is allocated by more than one allocation object.

    Msg 8913, Level 16, State 1, Line 1

    Extent (36:16) is allocated to 'GAM' and at least one other object.

    CHECKDB found 2 allocation errors and 0 consistency errors not associated with any single object.

    DBCC results for 'sys.sysrscols'.

    There are 6885 rows in 93 pages for object "sys.sysrscols".

    DBCC results for 'sys.sysrowsets'.

    There are 321 rows in 8 pages for object "sys.sysrowsets".

    DBCC results for 'sys.sysallocunits'.

    There are 340 rows in 14 pages for object "sys.sysallocunits".

    DBCC results for 'sys.sysfiles1'.

    There are 39 rows in 5 pages for object "sys.sysfiles1".

    DBCC results for 'sys.syspriorities'.

    There are 0 rows in 0 pages for object "sys.syspriorities".

    DBCC results for 'sys.sysfgfrag'.

    There are 22 rows in 1 pages for object "sys.sysfgfrag".

    DBCC results for 'sys.sysphfg'.

    There are 11 rows in 1 pages for object "sys.sysphfg".

    DBCC results for 'sys.sysprufiles'.

    There are 39 rows in 2 pages for object "sys.sysprufiles".

    DBCC results for 'sys.sysftinds'.

    There are 0 rows in 0 pages for object "sys.sysftinds".

    DBCC results for 'sys.sysowners'.

    There are 16 rows in 1 pages for object "sys.sysowners".

    DBCC results for 'sys.sysprivs'.

    There are 138 rows in 1 pages for object "sys.sysprivs".

    DBCC results for 'sys.sysschobjs'.

    There are 684 rows in 13 pages for object "sys.sysschobjs".

    DBCC results for 'sys.syscolpars'.

    There are 6865 rows in 186 pages for object "sys.syscolpars".

    DBCC results for 'sys.sysnsobjs'.

    There are 1 rows in 1 pages for object "sys.sysnsobjs".

    DBCC results for 'sys.syscerts'.

    There are 0 rows in 0 pages for object "sys.syscerts".

    DBCC results for 'sys.sysxprops'.

    There are 0 rows in 0 pages for object "sys.sysxprops".

    DBCC results for 'sys.sysscalartypes'.

    There are 35 rows in 1 pages for object "sys.sysscalartypes".

    DBCC results for 'sys.systypedsubobjs'.

    There are 0 rows in 0 pages for object "sys.systypedsubobjs".

    DBCC results for 'sys.sysidxstats'.

    There are 827 rows in 42 pages for object "sys.sysidxstats".

    DBCC results for 'sys.sysiscols'.

    There are 999 rows in 17 pages for object "sys.sysiscols".

    DBCC results for 'sys.sysbinobjs'.

    There are 23 rows in 1 pages for object "sys.sysbinobjs".

    DBCC results for 'sys.sysaudacts'.

    There are 0 rows in 0 pages for object "sys.sysaudacts".

    DBCC results for 'sys.sysobjvalues'.

    There are 1106 rows in 432 pages for object "sys.sysobjvalues".

    DBCC results for 'sys.sysclsobjs'.

    There are 30 rows in 1 pages for object "sys.sysclsobjs".

    DBCC results for 'sys.sysrowsetrefs'.

    There are 0 rows in 0 pages for object "sys.sysrowsetrefs".

    DBCC results for 'sys.sysremsvcbinds'.

    There are 0 rows in 0 pages for object "sys.sysremsvcbinds".

    DBCC results for 'sys.sysxmitqueue'.

    There are 0 rows in 0 pages for object "sys.sysxmitqueue".

    DBCC results for 'sys.sysrts'.

    There are 1 rows in 1 pages for object "sys.sysrts".

    DBCC results for 'sys.sysconvgroup'.

    There are 0 rows in 0 pages for object "sys.sysconvgroup".

    DBCC results for 'sys.sysdesend'.

    There are 0 rows in 0 pages for object "sys.sysdesend".

    DBCC results for 'sys.sysdercv'.

    There are 0 rows in 0 pages for object "sys.sysdercv".

    DBCC results for 'sys.syssingleobjrefs'.

    There are 154 rows in 1 pages for object "sys.syssingleobjrefs".

    DBCC results for 'sys.sysmultiobjrefs'.

    There are 1698 rows in 21 pages for object "sys.sysmultiobjrefs".

    DBCC results for 'sys.sysguidrefs'.

    There are 10 rows in 1 pages for object "sys.sysguidrefs".

    DBCC results for 'sys.syscompfragments'.

    There are 0 rows in 0 pages for object "sys.syscompfragments".

    DBCC results for 'sys.sysftstops'.

    There are 0 rows in 0 pages for object "sys.sysftstops".

    DBCC results for 'sys.sysqnames'.

    There are 97 rows in 1 pages for object "sys.sysqnames".

    DBCC results for 'sys.sysxmlcomponent'.

    There are 99 rows in 1 pages for object "sys.sysxmlcomponent".

    DBCC results for 'sys.sysxmlfacet'.

    There are 112 rows in 1 pages for object "sys.sysxmlfacet".

    DBCC results for 'sys.sysxmlplacement'.

    There are 18 rows in 1 pages for object "sys.sysxmlplacement".

    DBCC results for 'sys.sysobjkeycrypts'.

    There are 0 rows in 0 pages for object "sys.sysobjkeycrypts".

    DBCC results for 'sys.sysasymkeys'.

    There are 0 rows in 0 pages for object "sys.sysasymkeys".

    DBCC results for 'sys.syssqlguides'.

    There are 0 rows in 0 pages for object "sys.syssqlguides".

    DBCC results for 'sys.sysbinsubobjs'.

    There are 3 rows in 1 pages for object "sys.sysbinsubobjs".

    DBCC results for 'sys.syssoftobjrefs'.

    There are 1017 rows in 21 pages for object "sys.syssoftobjrefs".

    DBCC results for 'xx'.

    There are 496516 rows in 5063 pages for object "xx".

    DBCC results for 'xx'.

    There are 0 rows in 0 pages for object "xx".

    DBCC results for 'xx'.

    There are 36527 rows in 323 pages for object "xx".

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    There are 0 rows in 0 pages for object "xx".

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    There are 26 rows in 1 pages for object "xx".

    DBCC results for 'xx'.

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    There are 23 rows in 1 pages for object "xx".

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    There are 7771805 rows in 287580 pages for object "xx".

    DBCC results for 'xx'.

    There are 6 rows in 1 pages for object "xx".

    DBCC results for 'xx'.

    There are 0 rows in 0 pages for object "xx".

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    There are 283 rows in 4 pages for object "xx".

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    DBCC results for 'xx'.

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    DBCC results for 'xxe'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xxx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

    There are 5421 rows in 298 pages for object "xx".

    DBCC results for 'xx'.

    There are 1409763 rows in 94349 pages for object "xx".

    DBCC results for 'xx'.

    There are 0 rows in 0 pages for object xx".

    DBCC results for 'xx'.

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    There are 23307 rows in 1550 pages for object "xx".

    DBCC results for 'xx'.

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    DBCC results for 'xx'.

    There are 0 rows in 0 pages for object "xx".

    DBCC results for 'xx'.

    There are 1317 rows in 80 pages for object "xx".

    DBCC results for 'xx'.

    There are 44817 rows in 2505 pages for object "Txx".

    DBCC results for 'xx'.

    There are 0 rows in 0 pages for object "xx".

    DBCC results for 'xx'.

    There are 3249 rows in 92 pages for object "xx".

    DBCC results for 'xx'.

    There are 0 rows in 0 pages for object "xx".

    DBCC results for 'xx'.

    There are 38344 rows in 898 pages for object "xx".

    DBCC results for 'xx'.

    There are 0 rows in 0 pages for object "xx".

    DBCC results for 'xx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xx'.

    There are 0 rows in 0 pages for object "xx".

    DBCC results for 'xx'.

    There are 8373457 rows in 557668 pages for object "xx".

    DBCC results for 'xx'.

    There are 11210622 rows in 456655 pages for object "xx".

    DBCC results for 'xx'.

    There are 33890 rows in 2101 pages for object "xx".

    DBCC results for 'xx'.

    There are 2566718 rows in 12402 pages for object "xx".

    DBCC results for 'xx'.

    There are 0 rows in 0 pages for object "xx".

    DBCC results for 'xx'.

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    DBCC results for 'xx'.

    There are 14836140 rows in 1038453 pages for object "xx".

    DBCC results for 'xx'.

    There are 14179 rows in 597 pages for object "xx".

    DBCC results for 'xx'.

    There are 127473 rows in 7105 pages for object "xx".

    DBCC results for 'xx'.

    Msg 8913, Level 16, State 3, Line 1

    Extent (36:16) is allocated to 'xx' and at least one other object.

    Msg 8976, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Page (36:16) was not seen in the scan although its parent (38:4256353) and previous (37:4258279) refer to it. Check any previous errors.

    Msg 8980, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Index node page (38:4256353), slot 83 refers to child page (36:17) and previous child (36:16), but they were not encountered.

    Msg 8980, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Index node page (38:4256353), slot 84 refers to child page (36:18) and previous child (36:17), but they were not encountered.

    Msg 8980, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Index node page (38:4256353), slot 85 refers to child page (36:19) and previous child (36:18), but they were not encountered.

    Msg 8980, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Index node page (38:4256353), slot 86 refers to child page (36:20) and previous child (36:19), but they were not encountered.

    Msg 8980, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Index node page (38:4256353), slot 87 refers to child page (36:21) and previous child (36:20), but they were not encountered.

    Msg 8980, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Index node page (38:4256353), slot 88 refers to child page (36:22) and previous child (36:21), but they were not encountered.

    Msg 8980, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Index node page (38:4256353), slot 89 refers to child page (36:23) and previous child (36:22), but they were not encountered.

    Msg 8978, Level 16, State 1, Line 1

    Table error: Object ID 1499868410, index ID 1, partition ID 72057594219397120, alloc unit ID 72057594238009344 (type In-row data). Page (38:4259448) is missing a reference from previous page (36:23). Possible chain linkage problem.

    There are 329342272 rows in 7631236 pages for object "xxxx".

    CHECKDB found 1 allocation errors and 9 consistency errors in table 'xxxx' (object ID 1499868410).

    DBCC results for 'xxx'.

    There are 16444 rows in 107 pages for object "xxx".

    DBCC results for 'xxx'.

    There are 3064 rows in 88 pages for object "xxx".

    DBCC results for 'Txxx'.

    There are 2398670 rows in 7428 pages for object "xxx2".

    DBCC results for 'xxx'.

    There are 38344 rows in 881 pages for object "xxx".

    DBCC results for 'Txxx'.

    There are 938 rows in 52 pages for object "xx".

    DBCC results for 'xxx'.

    There are 5547 rows in 331 pages for object "xxx".

    DBCC results for 'xxx'.

    There are 0 rows in 2 pages for object "xxx".

    DBCC results for 'xxx'.

    There are 4919249 rows in 268428 pages for object "xxx".

    DBCC results for 'xxx'.

    There are 36572 rows in 2470 pages for object "xxxx".

    DBCC results for 'xxxx'.

    There are 13292706 rows in 885750 pages for object "xxx".

    DBCC results for 'xxx'.

    There are 36572 rows in 2470 pages for object "xxxx".

    DBCC results for 'xxxx'.

    There are 117677 rows in 7308 pages for object "xxxx".

    DBCC results for 'xxx'.

    There are 0 rows in 2 pages for object "Txxxx".

    DBCC results for 'xxx'.

    There are 0 rows in 2 pages for object "xxx".

    DBCC results for 'xxx'.

    There are 0 rows in 2 pages for object "xxxx".

    DBCC results for 'xxx'.

    There are 0 rows in 2 pages for object "xxx".

    DBCC results for 'xxxx'.

    There are 21210 rows in 1389 pages for object "xxxx".

    DBCC results for 'xxx'.

    There are 63536760 rows in 1245819 pages for object "xxxr".

    DBCC results for 'xxx'.

    There are 21210 rows in 1393 pages for object "Txxx".

    DBCC results for 'xxx'.

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    DBCC results for 'xxx'.

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    DBCC results for 'xxxx'.

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    DBCC results for 'xxxx'.

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    DBCC results for 'xxxx'.

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    DBCC results for 'xxxx'.

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    DBCC results for 'xxx'.

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    DBCC results for 'xxx'.

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    DBCC results for 'xxxx'.

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    DBCC results for 'xxx'.

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    DBCC results for 'xxx'.

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    DBCC results for 'xxx'.

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    DBCC results for 'xxx'.

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    DBCC results for 'xxxx'.

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    DBCC results for 'sys.queue_messages_1977058079'.

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    DBCC results for 'xxxx'.

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    DBCC results for 'xxx'.

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    DBCC results for 'xxxx'.

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    DBCC results for 'xx'.

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    DBCC results for 'xxx'.

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    DBCC results for 'sys.queue_messages_2041058307'.

    There are 0 rows in 0 pages for object "sys.queue_messages_2041058307".

    DBCC results for 'xxx'.

    There are 34204 rows in 2122 pages for object "xxxx".

    DBCC results for 'sys.filestream_tombstone_2073058421'.

    There are 0 rows in 0 pages for object "sys.filestream_tombstone_2073058421".

    DBCC results for 'sys.syscommittab'.

    There are 0 rows in 0 pages for object "sys.syscommittab".

    DBCC results for 'xxxx'.

    There are 2279071 rows in 26197 pages for object "xxx".

    DBCC results for 'xxxx'.

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    DBCC results for 'xxxx'.

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    DBCC results for 'xxxx'.

    There are 21 rows in 1 pages for object "xxx".

    DBCC results for 'xxxx'.

    There are 24 rows in 1 pages for object "xx".

    CHECKDB found 3 allocation errors and 9 consistency errors in database 'XXXXXX'.

    repair_allow_data_loss is the minimum repair level for the errors found by DBCC CHECKDB (XXXXXX).

    DBCC execution completed. If DBCC printed error messages, contact your system administrator.

    Thanks

  • Do you have a clean full backup (one without the corruption) and an unbroken chain of log backups?

    Gail Shaw
    Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
    SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

    We walk in the dark places no others will enter
    We stand on the bridge and no one may pass
  • I have the backup. My question is i want to understand that error. I guess it is a page corruption error.

    What you say Gail..

    If posible just help to understand that error.

  • Exactly, it's a page corruption, likely caused by some problem with the IO subsystem. Basically you have a dedicated extent (extent belonging to one object) that's marked as owned by two different objects. I can think of a few IO-type errors that could cause that.

    Take a tail-log backup, then restore full backup from before, all log backups and end with the tail-log backup that you just took, that should recover the DB without corruption right up to the current point.

    Then do some investigations of the IO subsystem, check logs, run diagnostics, etc. That's everything from filter drivers right down to the physical disks themselves.

    Gail Shaw
    Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
    SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

    We walk in the dark places no others will enter
    We stand on the bridge and no one may pass
  • Okay.

    Thanks a lot..

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