SQL Server Errors or Failures Error: 825 to Error: 856

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Error: 825, Severity: 10,
A read of the file ‘%ls’ at offset %#016I64x succeeded after failing %d time(s) with error: %ls. Additional messages in the SQL Server error log and system event log may provide more detail. This error condition threatens database integrity and must be co

Error: 826, Severity: 10,
incorrect pageid (expected %d:%d; actual %d:%d)

Error: 829, Severity: 21,
Database ID %d, Page %S_PGID is marked RestorePending, which may indicate disk corruption. To recover from this state, perform a restore.

Error: 830, Severity: 10,
stale page (a page read returned a log sequence number (LSN) (%u:%u:%u) that is older than the last one that was written (%u:%u:%u))

Error: 831, Severity: 20,
Unable to deallocate a kept page.

Error: 832, Severity: 24,
A page that should have been constant has changed (expected checksum: %08x, actual checksum: %08x, database %d, file ‘%ls’, page %S_PGID). This usually indicates a memory failure or other hardware or OS corruption.

Error: 833, Severity: 10,
SQL Server has encountered %d occurrence(s) of I/O requests taking longer than %d seconds to complete on file [%ls] in database [%ls] (%d). The OS file handle is 0x%p. The offset of the latest long I/O is: %#016I64x

Error: 844, Severity: 10,
Time out occurred while waiting for buffer latch — type %d, bp %p, page %d:%d, stat %#x, database id: %d, allocation unit id: %I64d%ls, task 0x%p : %d, waittime %d seconds, flags 0x%I64x, owning task 0x%p. Continuing to wait.

Error: 845, Severity: 17,
Time-out occurred while waiting for buffer latch type %d for page %S_PGID, database ID %d.

Error: 846, Severity: 10,
A time-out occurred while waiting for buffer latch — type %d, bp %p, page %d:%d, stat %#x, database id: %d, allocation unit Id: %I64d%ls, task 0x%p : %d, waittime %d seconds, flags 0x%I64x, owning task 0x%p. Not continuing to wait.

Error: 847, Severity: 10,
Timeout occurred while waiting for latch: class ‘%ls’, id %p, type %d, Task 0x%p : %d, waittime %d seconds, flags 0x%I64x, owning task 0x%p. Continuing to wait.

Error: 848, Severity: 10,
Using large pages in the memory manager.

Error: 849, Severity: 10,
Using locked pages in the memory manager.

Error: 850, Severity: 10,
%I64u MB of large page memory allocated.

Error: 851, Severity: 10,
the page is in an OFFLINE file which cannot be read

Error: 852, Severity: 10,
Using conventional memory in the memory manager.

Error: 853, Severity: 10,
Latch acquire failed due to too many concurrent latches. type %d, Task 0x%p : %d

Error: 854, Severity: 10,
Machine supports memory error recovery. SQL memory protection is enabled to recover from memory corruption.

Error: 855, Severity: 10,
Uncorrectable hardware memory corruption detected. Your system may become unstable. Please check the Windows event log for more details.

Error: 856, Severity: 10,
SQL Server has detected hardware memory corruption in database ‘%ls’, file ID: %u, page ID; %u, memory address: 0x%I64x and has successfully recovered the page.

This is applicable on below versions of SQL Server

SQL Server 2005
SQL Server 2008 R2
SQL Server 2012
SQL Server 2014

Hope this was helpful.

Thanks,
SQLServerF1 Team
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