Dbcc Checkdb Error 8939
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Sql Server Msg 8939
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how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top How can I correct SQL Server Error 8928? up vote 2 down vote favorite I received the following error message in an application running against one of my databases: SQL Server detected a logical consistency-based I/O error: incorrect checksum (expected: 0xfdff74c9; actual: 0xfdff74cb). It occurred
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during a read of page (1:69965) in database ID 5 at offset 0x0000002229a000 in file 'e:\SQL Server\MSSQL.1\MSSQL \[DB_Name].mdf'. Additional messages in the SQL Server error log or system event log may provide more detail. This is a severe error condition that threatens database integrity and must be corrected immediately. Complete a full database consistency check (DBCC CHECKDB). This error can be caused by many factors; for more information, see SQL Server Books Online. That sounded bad so I ran the following: DBCC CHECKDB ([DB_Name]) WITH NO_INFOMSGS, ALL_ERRORMSGS And received the following report: Msg 8928, Level 16, State 1, Line 1 Object ID 1326627769, index ID 1, partition ID 72057594048872448, alloc unit ID 72057594055557120 (type LOB data): Page (1:69965) could not be processed. See other errors for details. Msg 8939, Level 16, State 98, Line 1 Table error: Object ID 1326627769, index ID 1, partition ID 72057594048872448, alloc unit ID 72057594055557120 (type LOB data), page (1:69965). Test (IS_OFF (BUF_IOERR, pBUF->bstat)) failed. Values are 12716041 and -4. Msg 8965, Level 16, State 1, Line 1 Table error: Object ID 1326627769, index ID 1, partition ID 72057594048872448, alloc unit ID 72057594055557120 (type LOB data). The off-row data node at page (1:699
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(SS2K8 / SS2K8 R2) » DBCC CHECKDB error! 17 posts,Page 1 of 212»» DBCC CHECKDB error! Rate dbcc checkdb sybase Topic Display Mode Topic Options Author Message s*1918s*1918 Posted Thursday, January 26, 2012 8:26 AM SSC Rookie Group: General Forum Members Last Login: Friday, February 12, 2016 http://dba.stackexchange.com/questions/73649/how-can-i-correct-sql-server-error-8928 3:48 PM Points: 34, Visits: 97 Following error I am getting when I ran DBCC CHECKDB('databasename') WITH NO-INFOMSGS Msg 8939, Level 16, State 98, Line 1Table error: Object ID 0, index ID -1, partition ID 0, alloc unit ID 296997425053696 (type Unknown), page (0:-1069739771). Test (IS_OFF (BUF_IOERR, pBUF->bstat)) failed. Values are 12716041 and -1.Msg 8939, Level http://www.sqlservercentral.com/Forums/Topic1242225-2893-1.aspx 16, State 98, Line 1Table error: Object ID 0, index ID -1, partition ID 0, alloc unit ID 317901150158848 (type Unknown), page (8481:555819297). Test (IS_OFF (BUF_IOERR, pBUF->bstat)) failed. Values are 12716041 and -10.Msg 8939, Level 16, State 98, Line 1Table error: Object ID 0, index ID -1, partition ID 0, alloc unit ID 317901150158848 (type Unknown), page (8481:555819297). Test (IS_OFF (BUF_IOERR, pBUF->bstat)) failed. Values are 12716041 and -12.Msg 8939, Level 16, State 98, Line 1Table error: Object ID 0, index ID -1, partition ID 0, alloc unit ID 317901150158848 (type Unknown), page (8481:555819297). Test (IS_OFF (BUF_IOERR, pBUF->bstat)) failed. Values are 12716041 and -12.Msg 8939, Level 16, State 98, Line 1Table error: Object ID 0, index ID -1, partition ID 0, alloc unit ID 317901150158848 (type Unknown), page (8481:555819297). Test (IS_OFF (BUF_IOERR, pBUF->bstat)) failed. Values are 12716041 and -14.Msg 8939, Level 16, State 98, Line 1Table error: Object ID 0, index ID -1, partition ID 0, alloc unit ID 317901150158848 (type Unknown), page (8481:555819297). Test (IS_OFF
that people are hitting - Msg 8967, Level 16, State 216By: Paul Randal Posted on: May 22, 2008 10:20 pm Before I start, I want to make it clear that you can only hit this bug if you ALREADY have corruption, that http://www.sqlskills.com/blogs/paul/checkdb-bug-that-people-are-hitting-msg-8967-level-16-state-216/ it's quite rare, and that there is a workaround. I've noticed a few more people in the forums having CHECKDB fail with this particular error in the last month Msg 8967, Level 16, State 216, Line 1 An internal error occured in http://www.sqlnotes.info/2013/05/02/fix-page-checksum/ DBCC which prevented further processing. Please contact Product Support. instead of completing properly and listing the corruptions in the database. Whenever CHECKDB is using a database snapshot, it must check that the page it read through the snapshot does not have an dbcc checkdb LSN (Log Sequence Number) higher than that when the snapshot was created. If it did, this would mean that the page was modified AFTER the snapshot was created and hence CHECKDB would be working from an inconsistent view of the database. If this case is discovered, CHECKDB stops immediately. When I rewrote CHECKDB for SQL Server 2005, I changed a bunch of code assertions into seperate states of the 8967 error, so that CHECKDB would fail gracefully if some condition occured that indicates dbcc checkdb error a bug or something that should never happen. State 216 is for the bad LSN condition I've just described. I used to think it was caused by a race condition with the NTFS code that implements sparse files, which is used by the hidden database snapshot that CHECKDB uses by default. However, I've come to learn that this is a bug in CHECKDB (not one of mine I should say :-)) that causes this behavior under certain circumstances when corruption is present. The bug is that if a corrupt page fails auditing inside CHECKDB, the LSN check is still performed. If the corruption affects the LSN stamped in the page header, the 8967 error could be triggered. I've seen this a handful of times in the last few weeks - hence the need for a blog post. I've discussed this with the dev team and hopefully the fix will make it into the next SPs for 2005 and 2008 (too late to fix such a rare problem in such a critical component at this stage of 2008 development). They're going to put a KB article together too - but in the meantime, I wanted to get this on the Internet so Google/Live Search pick it up. [Edit: June 24 2010 - this still hasn't been fixed AFAIK - see KB 960791 which just discusses the workaround.) Now let's repro the problem. Starting with a simple database and table, I'll find the first page so I can corrupt it. CREAT
is used to detect issues on the storage system to ensure what has been read from the disk is what has been written to the disk. When the checksum is detected which is not the one it's supposed to be, the page will not be read into the buffer pool. SQL Server will return error. If you are sure the data on the page are all correct or the checksum is broken purposely, you do have the option to fix it even you don't know how to calculate it. Now let's create our experimental database to get this fun stuff done. use master drop database Test1 create database Test1 go use Test1 go create table t1(Field1 char(10)) go insert into t1 values('AAAAAAAAAA') select * from t1 /* Field1 ---------- AAAAAAAAAA (1 row(s) affected) */ Now let's break it -- first find out where it is use master go alter database Test1 set single_user with rollback immediate go dbcc traceon(3604) go dbcc ind(test1, t1,0) -- page 118 in my case go -- then, check the record dbcc page (test1, 1, 118, 1) /* Slot 0, Offset 0x60, Length 17, DumpStyle BYTE Record Type = PRIMARY_RECORD Record Attributes = NULL_BITMAP Record Size = 17 Memory Dump @0x0000000010F0A060 0000000000000000: 10000e00 41414141 41414141 41410100 00 ....AAAAAAAAAA... */ --Now let's modify one of the A to B dbcc writepage(test1, 1, 118, 100, 1, 0x42, 1) --Notice that the last parameter I used is 1 not the default value --this will bypass the the buffer pool and direct write the data to the page on disk --Buffer pool calculates the checksum before writting. If I bypass it --it will mean the checksum is broken. go --Let's check the page again dbcc page (test1, 1, 118, 1) /* Slot 0, Offset 0x60, Length 17, DumpStyle BYTE Record Type = PRIMARY_RECORD Record Attributes = NULL_BITMAP Record Size = 17 Memory Dump @0x0000000009D7A060 0000000000000000: 10000e00 42414141 41414141 41410100 00 ....BAAAAAAAAA... */ go Ok, now we successfully break the page. if you run DBCC CheckDB(Test1), you will see following errors
Msg 8939, Level 16, State 98, Line 1
Table error: Object ID 245575913, index ID 0, partition ID 72057594039042048, alloc unit ID 72057594043432960 (type In-row data), page (1:118). Test (IS_OFF (BUF_IOERR, pBUF->bstat)) failed. Values are 2057 and -4.
Msg 8928, Level 16, State 1, Line 1
Object ID 245575913, index ID 0, partition ID 72057594039042048, alloc unit ID 72057594043432960 (type In-row data): Page (1:118) could not be processed. See other errors for details.
It does not give you too much information. What if you run select * from Test1.dbo.t1. The error you you get is very mouthful
Msg 824