{"id":2465,"date":"2023-12-08T17:23:49","date_gmt":"2023-12-08T11:53:49","guid":{"rendered":"https:\/\/nuventureconnect.com\/blog\/?p=2465"},"modified":"2026-02-04T11:30:16","modified_gmt":"2026-02-04T06:00:16","slug":"microsoft-exchange-circular-logging-mailbox-database","status":"publish","type":"post","link":"https:\/\/nuventureconnect.com\/blog\/2023\/12\/08\/microsoft-exchange-circular-logging-mailbox-database\/","title":{"rendered":"Microsoft Exchange Server: Mailbox Databases and Circular Logging"},"content":{"rendered":"
\n
\"\"<\/figure><\/div>\n\n\n

Microsoft Exchange Server<\/a> is Microsoft’s Email, Calendaring, Contact, Scheduling and Collaboration platform. Originally developed as an email system, Exchange Server has evolved over time and has expanded into a groupware solution with advanced features. It is now a foundational component of Microsoft 365 as a software as a service (SaaS) offering in the Microsoft cloud with Microsoft acting as the service provider.<\/p>\n\n\n\n

Microsoft also provides the option of integrating the Exchange Server into our own IT infrastructure.<\/p>\n\n\n\n

This involves acquiring the Server License<\/a> and CALs (Client Access Licenses)<\/a> to run Microsoft Exchange Server on-premises.<\/p>\n\n\n\n

This ensures we will have control and authority over the Exchange platform, including complete control over the Mailbox databases, and the specifications and settings. But this also means we are responsible for managing every aspect of the Exchange environment.<\/p>\n\n\n\n

While Microsoft has made it really easy to configure and manage the Exchange environment, the high disk usage of Exchange Servers is a problem that IT administrators have to deal with.<\/p>\n\n\n\n

Here we will see how Circular Logging for Mail Databases can be used to free up disk space in the on-premise Exchange Servers.<\/p>\n\n\n\n

During the installation, the Exchange the database files are automatically created in a directory path following the below syntax\u2026
\\Program Files\\Microsoft\\Exchange Server\\VXX\\Mailbox\\Mailbox Database NNNNNNNNNN<\/strong>
NOTE:
\u21fe VXX (eg: V15 | Directory V15 may change according to Microsoft Exchange Server version)
\u21fe Mailbox Database NNNNNNNNNN<\/strong> (eg: Mailbox Database 1136988849)
The Exchange Server Mailbox data can be located in all of the following three locations:-
\u2022 Server Memory<\/strong>
\u21d2 This is where Mailbox data is cached and where new transactions are created.<\/p>\n\n\n\n

\u2022 Mailbox Database<\/strong>
\u21d2 Named in the format Mailbox Database NNNNNNNNNN<\/strong>.edb<\/strong> (eg: Mailbox Database
1136988849.edb<\/strong>).
This is an Exchange database file that contains one or more mailboxes and all messaging data,
such as, Emails, Appointments, Meetings, Contacts, Tasks, Notes etc. along with the Mailbox
directory structure.<\/p>\n\n\n\n

\u2022 Transaction Log Files<\/strong>
\u21d2 This is where all transactions are stored before they are flushed to the Mailbox database. But it
must be noted that the latest information is always in the server memory, and only once this
information is committed to the Mailbox database, those transactions will be updated in the log
files. Following are the files involved with transaction logs.<\/p>\n\n\n\n

\u27f6 ENN.log (eg: E00.log, E01.log)<\/strong>
This file holds transactions that reflect all actions performed within the Exchange database.
Once this file goes over 1024 KB in size then another file is created, while the existing file is
renamed to another file in the naming format ENNHHHHHHH.log<\/strong> which will be explained
below.<\/p>\n\n\n\n

\u27f6 ENNtmp.log (<\/strong>E00tmp.log, E01tmp.log)<\/strong>
This is a temporary file which is used at the moment when a new log file ENN.log<\/strong> is created.<\/p>\n\n\n\n

\u27f6 ENNHHHHHHH.log<\/strong> (eg: E010002576A.log, E010002576B.log, E010002576C.log)
These files consist of transactions that are already accepted and added to the database. They
are necessary in data recovery scenarios.<\/p>\n\n\n\n

\u27f6 ENNresHHHHH.jrs <\/strong>(eg: E01res0000A.jrs, E01res00001.jrs, E01res00002.jrs)
These files are created along with logs of archive transactions, and they are used by Exchange
when disk space becomes full.<\/p>\n\n\n\n

\u27f6 ENN.chk <\/strong>(eg: E00.chk, E01.chk)
This is a checkpoint file used to maintain a relation between the information included in the
Mail Database and in the Logs. This file determines where recovery will begin. MS Exchange
thinks that all information in transaction log files below the checkpoint file will be safely
stored in the Mailbox database, thus recovery will begin at the location indicated by the
checkpoint file. If the checkpoint file is missing, the recovery will start with the oldest
available transaction log.<\/p>\n\n\n\n

Thus, Transactional logs can help us with getting back the MS Exchange Server from data corruption and recover itself to the latest operational state. But at the same time this feature can also heavily tax on disk usage.<\/p>\n\n\n\n

Circular Logging applies a storage limit of 1 MB<\/strong> to all our log files. And once that space has been exhausted, Microsoft Exchange Server overwrites the previous log files.
This ensures that the transaction logs are cleared right after the transactions have been moved to the Exchange Database, which prevents further diskspace from being used up by minimizing the number of saved log files.<\/p>\n\n\n\n

Interestingly, that is why it is called Circular Logging in the first place. The concept entails repetitive data overwrite rotations where the most recent log file replaces the oldest ones in the database.<\/p>\n\n\n\n

The default Circular Logging setting for most Microsoft Exchange Server versions is Disabled.<\/p>\n\n\n\n

WARNING:<\/strong> Enabling Circular Logging will have the following effects:-<\/p>\n\n\n\n

 \u21fe  Limits our database recovery capabilities. With the log files deleted, it would be impossible to
      restore all the data transactions in case the Exchange Server crashes.<\/p>\n\n\n\n

 \u21fe  Backing up our database incrementally will not work anymore because that would require a
      complete set of log files. Instead, we will be forced to back up the entire database over and over again.<\/p>\n\n\n\n

Let us enable Circular Logging in the Microsoft Exchange Server…<\/p>\n\n\n\n

  \u2022  First, we should analyze disk space to see which all Mailbox databases are using up the disk space.
     A third-party utility such as TreeSize (https:\/\/www.jam-software.com\/treesize_free<\/a>) can be used for this.<\/p>\n\n\n\n

 
 \u2022  Access MS Exchange Admin Centre via IIS Manager, go to the Sites<\/strong> section.<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

 <\/p>\n\n\n\n

\u2022  In Exchange admin center<\/strong>, go to servers<\/strong> \u21fe databases<\/strong>.<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

<\/p>\n\n\n\n

For each database, perform the following actions…

  \u279f Click Edit<\/strong> icon.<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

<\/p>\n\n\n\n

\u279f In maintenance, check Enable circular logging<\/strong>, and click Save<\/strong>.<\/p>\n\n\n\n


<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n


<\/p>\n\n\n\n

  \u279f Dismount<\/strong> the selected Database.<\/p>\n\n\n\n

<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

\u279f Mount<\/strong> the selected Database again.<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

<\/p>\n\n\n\n

Wait for some time until the Exchange Server clears up the old Transactional log files. The required time really depends on our disk usage and throughput.
Reanalyzing the disk space using Treesize can give us the actual disk space that has been freed up by Circular Logging. If your Exchange Server has been up and running for more than a year, chances are you have freed up a good amount of usable disk space!<\/p>\n\n\n\n

As organizations modernize their infrastructure, email platforms like Microsoft Exchange often coexist with broader private cloud environments. To understand how enterprise workloads are managed at scale, you may also find it helpful to read Demystifying Apache CloudStack: A Powerful Tool for Cloud Infrastructure Management<\/a>, which explores how CloudStack enables efficient, flexible cloud infrastructure management.<\/p>\n\n\n\n


<\/p>\n","protected":false},"excerpt":{"rendered":"

Microsoft Exchange Server is Microsoft’s Email, Calendaring, Contact, Scheduling and Collaboration platform. Originally developed as an email system, Exchange Server has evolved over time and has expanded into a groupware solution with advanced features. It is now a foundational component of Microsoft 365 as a software as a service (SaaS) offering in the Microsoft cloud […]<\/p>\n","protected":false},"author":98,"featured_media":2448,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[57,95],"tags":[5,60],"yoast_head":"\nMicrosoft Exchange Circular Logging Guide for Mailbox Databases<\/title>\n<meta name=\"description\" content=\"Learn how Microsoft Exchange Circular Logging works, how it affects transaction logs and mailbox databases, and when to enable it to manage disk space safely.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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