Configuration and Administration of Exchange Server 2003

How to Enable Circular Logging in Exchange Server 2003

Exchange creates log files of 5 MB each. These log files takes lot of disk space.

Circular logging conserves disk space by limiting the number of these log files. If circular logging is enabled, exchange will create 4 log files in most of the cases. Once all log files are filled up, exchange will clear the contents of first log file, and then start storing transactions in this file.

The only limitation of Circular Logging is that we can recover Exchange Server data only up until last full backup. We cannot perform incremental or differential backup if Circular logging is enabled.

You will be thinking then why Microsoft created this feature which limits the ability to recover Exchange during crash. As I previously discussed, this feature should only be used if you are out of space. But now days, disk space is not a problem anywhere.