Event ID - 474

Event Id474
SourceEDB
DescriptionInformation Store (2240) The database page read from the file "E:\program files\exchsrvr\mdbdata\priv1.edb" at offset 204275712 (0x000000000c2d0000) for 4096 (0x00001000) bytes failed verification due to a page checksum mismatch. The expected checksum was 303571876 (0x121823a4) and the actual checksum was 303571940 (0x121823e4). The read operation will fail with error -1018 (0xfffffc06). If this condition persists then please restore the database from a previous backup.
Event InformationWhen you try to back up your Microsoft Exchange Server 2003 or Microsoft Exchange 2000 Server Information Store database by using an Exchange online backup, you may experience this event.
For more information about this event click on the link given below.
Reference LinksHow to Determine Which Mailbox Owns a Particular Page in a Database

Error -1018 (JET_errReadVerifyFailure)

Overview of Exchange Server Database Architecture and Database Engine

Understanding and analyzing -1018, -1019, and -1022 Exchange database errors

Extensible Storage Engine Event IDs 474 and 477 Are Logged When You Try to Back Up the Information Store Database

Microsoft Exchange: Understanding and Resolving Error -1018

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