A single transaction log file is 1 MB in size, and there can be thousands of them in the mailbox database folder (their number depends on the activity of users in the mailbox database).
Transactional logs contain all operations that are performed on the database and are extremely important for the recovery of the damaged mailbox database. For instance: when sending/receiving an email message, Exchange first writes the information into the transaction log file, and only then saves the item directly to the mailbox database. The transaction logs of mailbox databases are one of the most important Exchange elements. How to Truncate/Purge Transaction Logs on Exchange? Cleanup Exchange Logs with PowerShell Script.Rotate and Remove IIS Log Files in Exchange.
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