I have a database where when I run the backup command
BACKUP DATABASE [MyDatabase] TO DISK = 'G:\Backup\MyDatabase_01_01_2018.bak' WITH NOFORMAT, NOSKIP, COMPRESSION, INIT, BUFFERCOUNT = 100
I get the error message
Msg 3043, Level 16, State 1, Line 8
BACKUP 'MyDatabase' detected an error on page (1:745345) in file 'F:\Data\MyDatabase_1.ndf'.
Msg 3013, Level 16, State 1, Line 8
BACKUP DATABASE is terminating abnormally.
I ran a full CHECKDB but it comes back clean. I did notice that the Page Verify option had been set to NONE (not my doing) so I changed it to CHECKSUM and rebuilt all the indexes in the DB to get it to write to all pages and generate checksums. After this the backup still fails and the checkdb still shows clean (so no change).
DBCC CHECKDB('MyDatabase') WITH NO_INFOMSGS, ALL_ERRORMSGS, DATA_PURITY, EXTENDED_LOGICAL_CHECKS;
from the SQL log:
DBCC CHECKDB (MyDatabase) WITH all_errormsgs, no_infomsgs, data_purity executed by xxx found 0 errors and repaired 0 errors. Elapsed time: 0 hours 21 minutes 46 seconds. Internal database snapshot has split point LSN = 000ab776:0000112f:0001 and first LSN = 000ab776:0000112d:0001.
I ran DBCC PAGE but it errors (doesn't even seem to be returning the right page in the first place). I CAN run it with print option 2 and it returns but honestly I don't know what I'm looking for there.
DBCC PAGE ('MyDatabase',1,745345,3)
PAGE: (3:513793) BUFFER: BUF @0x00000003811F8280 bpage = 0x00000000F2D70000 bhash = 0x0000000000000000 bpageno = (1:745345) bdbid = 5 breferences = 0 bcputicks = 0 bsampleCount = 0 bUse1 = 44283 bstat = 0x809 blog = 0x5adb215a bnext = 0x0000000000000000 PAGE HEADER: Page @0x00000000F2D70000 m_pageId = (3:513793) m_headerVersion = 1 m_type = 2 m_typeFlagBits = 0x4 m_level = 0 m_flagBits = 0x0 m_objId (AllocUnitId.idObj) = 1075937538 m_indexId (AllocUnitId.idInd) = 2 Metadata: AllocUnitId = 633462595911680 Metadata: PartitionId = 0 Metadata: IndexId = -1 Metadata: ObjectId = 0 m_prevPage = (3:513795) m_nextPage = (3:513820) pminlen = 17 m_slotCnt = 426 m_freeCnt = 2 m_freeData = 7338 m_reservedCnt = 0 m_lsn = (608841:643611:411) m_xactReserved = 0 m_xdesId = (0:0) m_ghostRecCnt = 0 m_tornBits = 0 DB Frag ID = 1 Allocation Status GAM (1:511232) = ALLOCATED SGAM (1:511233) = NOT ALLOCATED PFS (1:744096) = 0x40 ALLOCATED 0_PCT_FULL DIFF (1:511238) = NOT CHANGED ML (1:511239) = NOT MIN_LOGGED
Msg 2514, Level 16, State 8, Line 20
A DBCC PAGE error has occurred: Invalid page metadata - dump style 3 not possible.
Any ideas what I could try next? Server version is
Microsoft SQL Server 2014 (SP2-CU11) (KB4077063) - 12.0.5579.0 (X64) Feb 21 2018 12:19:47 Copyright (c) Microsoft Corporation Developer Edition (64-bit) on Windows NT 6.3 (Build 9600: ) (Hypervisor)
Compatibility level of the DB is 100 (SQL 2008).