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What caused this database corruption?

Most database corruption (database consistency errors) comes from hardware issues mainly disk issues. The first place to look is, IO subsystem not behaving well. If there are issues then there it could just be a matter of time before other databases on same drive gets corrupted.

Try looking into the system event log. You may find disk related errors which could be the root cause of your corruption.

You may see disk related errors like:

01/12/2010 19:54:36 Cissesrv Error None 24606 N/A TESTSERVER01 "Logical drive 3 configured on array controller P410i [Embedded] returned a fatal error during a read/write request from/to the volume.
Logical block address 257513711, block count 1024 and command 32 were taken from the failed logical I/O request.
Array controller P410i [Embedded] is also reporting that the last physical drive to report a fatal error condition (associated with this logical request), is located on bus 0 and ID 3. "
01/12/2010 19:54:36 Cissesrv Error None 24606 N/A TESTSERVER01 "Logical drive 3 configured on array controller P410i [Embedded] returned a fatal error during a read/write request from/to the volume.
Logical block address 257513711, block count 1024 and command 32 were taken from the failed logical I/O request.
Array controller P410i [Embedded] is also reporting that the last physical drive to report a fatal error condition (associated with this logical request), is located on bus 0 and ID 3. "
01/12/2010 19:54:18 dmio Warning None 35 N/A TESTSERVER01 dmio: Disk Harddisk2 block 257512687 (mountpoint E:): Uncorrectable read error
01/12/2010 19:54:18 dmio Information None 29 N/A TESTSERVER01 dmio: Harddisk2 read error at block 257512687: status 0xc0000185
01/12/2010 19:54:18 Disk Error None 11 N/A TESTSERVER01 The driver detected a controller error on \Device\Harddisk2. 

If you find any disk related issue, you need to engage your platform team to fix the issue or replace the disk as per error messages. Like, the above error messages leads to a disk failure if no action is taken.

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