replaying the logs in exchange

what is replaying the logs in exchange and why to do this.
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Replaying of logs means to "receive/send" all mails etc... again.
all the transactions made by exchange are kept in these logs and in case of disaster, you can replay these logs to recover the mails

more info:
These articles may help you undersand replaying of log files

Understanding the Exchange 2010 Store

Exchange Server Log File Replay

Exchange Transaction Logs and Checkpoint Files
Madan SharmaConsultantCommented:
Microsoft Exchange uses the ESE (Extensible Storage Engine) to store the mailbox database which is based on logs files. First email data stores in a log file after it write to the edb. and when we do backup the extra logs files are removed from our server and only remains which are still not written into the .edb file.
check this article how ESE works :-

When we deployed High Availability for our exchange then we require log files to replay to update the second copy of the database. In Exchange 2010 logs files replication happen over TCP while in earlier verisons replication was happen over SMB's

Yogesh_Exchange_ExpertAuthor Commented:
i just need a simple answer why to replay log files in practical scenario in which circumstances we have to run and what is the impact of it on exchange database.

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