Easy methods to Resolve "Unable to Learn the Log File Header" Trade Server Error
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Microsoft Trade Server is designed to jot down all of the database transactions to sure log information and commit them later at any time when the system permits. The transactions additionally exist in system reminiscence, however get misplaced within the occasion of crash. If the Trade Server undergoes sudden crash, these transaction logs function the essential restoration technique. Because of this, the transaction lof information needs to be saved on a dependable system. The log file header comprises data like file signature, base title, creation time, checkpoint and so forth. At instances, your Trade Server signifies as it’s unable to learn this data. These are vital conditions that will compel you to revive the info from a web-based backup or carry out arduous restoration in your databases. Nonetheless, it’s extremely advisable that you simply attempt to transfer Trade mailboxes on one other server or use an Trade Restoration product to restore the database.
To exemplify, take into account a state of affairs while you obtain the under error together with your Trade Server database:
“Unable to learn the log file header.”
The error is logged as occasion 412 in utility occasion log. The ESE error code that shows in Description part of this occasion provides detailed data of the basis trigger.
Trigger
Because the error suggests, it happens when Trade database engine can’t learn the file header. This means that log file has a mismatching signature, has corrupted header data or is corrupt. You may deduce the precise trigger by the ESE error code the occasion reveals:
- Jet_errLog fileCorrupt or error -501: The header of the log file is corrupt
- Jet_errBadLogSignature or error -530: The log information signature mismatch. The log file signature ensures the right replaying of log information set and is included in every database header. The error happens after they mismatch.
- Jet_errDiskIO or error -1022: A disk I/O problem for requested web page in transaction log or database. Typically, -1022 error happens due to extreme database corruption. For a log file, the trigger is corruption of log file header.
Answer
It is advisable use any of the under procedures:
- Verify for the final on-line backup and restore
- In case of legitimate backup unavailability, you possibly can run eseutil /p command and later isinteg – repair command. It’s a arduous command and information loss is probably going as will delete database pages. Thus, in your manufacturing database, it is strongly recommended to make use of one other MicrosoftExchange Restoration technique like transferring the mailboxes to different database or utilizing an Trade Restoration software program.
