Checkpoint file deleted

What will happen if the checkpoint file from exchange has been deleted.
What all changes will be there in new Checkpoint.

Hi,
The Exchange store uses write-ahead transaction logs and checkpoint files to help prevent data loss. Transaction logs record all the changes that have been committed to the in-memory database, while checkpoint files record which logged transactions have
been written to the on-disk database files.
When we recover database, the Exchange store only needs to replay transactions that occurred after the checkpoint. Depending on the time period between backups, this can greatly decrease the number of transactions that must be replayed into the database
if a system failure occurs.
If the checkpoint files are deleted, then the Exchange store will replay all available transaction logs instead of starting from the middle of an available sequence. After you mount your Exchange database, a new checkpoint is created automatically.
Here is a related article which may help you to understand the checkpoint file for your reference. Please refer to the "Understanding Transaction Logging" section.
Understanding the Exchange 2010 Store
http://technet.microsoft.com/en-us/library/bb331958(v=exchg.141).aspx#UTL
Best regards,
Belinda
Belinda Ma
TechNet Community Support

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