Exchange Hard Drive Recovery

support writes "Microsoft® Exchange Server transaction logging is a robust disaster recovery mechanism that is designed to reliably restore an Exchange database to a consistent state after any sudden stop of the database. The logging mechanism is also used when restoring online backups.

Before changes are actually made to an Exchange database file, Exchange writes the changes to a transaction log file. After a change has been safely logged, it can then be written to the database file.
It is common for changes to become available to end users just after the changes have been secured to the transaction log, but before they have been written to the database file. Exchange employs a sophisticated internal memory management system that is tuned for high performance. Physically writing out changes to the database file is a low-priority task during normal operation. Exchange can efficiently manage caching of more than a gigabyte of database pages. This cache includes pages read from the database to fulfill client requests, as well as changed pages that will eventually be written back to the database file.

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