{"id":17748,"date":"2018-04-18T12:02:22","date_gmt":"2018-04-18T12:02:22","guid":{"rendered":"https:\/\/www.stellarinfo.com\/blog\/?p=17748"},"modified":"2025-04-10T10:57:32","modified_gmt":"2025-04-10T10:57:32","slug":"enable-circular-logging-exchange-server","status":"publish","type":"post","link":"https:\/\/www.stellarinfo.com\/blog\/enable-circular-logging-exchange-server\/","title":{"rendered":"How to Enable Circular Logging in Exchange Server"},"content":{"rendered":"<?xml encoding=\"utf-8\" ?><?xml encoding=\"utf-8\" ?><p>Circular logging allows Microsoft Exchange to overwrite transaction log files after the data that the log files contain has been committed to the database. Circular logging is not recommended in production environments since by enabling it, you reduce drive storage space requirements. <\/p><p>But without a complete set of transaction log files, you cannot recover any data more recent than the last full backup, thus increasing the chances of database corruption. <\/p><p>However, you can use Exchange recovery tools such as Eseutil or Stellar Repair for Exchange to repair corrupt EDB files and restore mailbox items.&nbsp;<\/p><h2 class=\"wp-block-heading\" id=\"how-circular-logging-works?\">How Circular Logging Works?<\/h2><p>When<strong> Circular Logging<\/strong> is disabled, every log file goes into the transactional log database, and no limit exists as to how large that database can get. When circular logging is enabled, the transactional log can only grow to one megabyte (1 MB) in size. When this limit has been reached, the first log file is overwritten automatically to keep the transactional log database from growing any larger. <\/p><p>The term &ldquo;<strong>circular<\/strong>&rdquo; arises from the fact that the set of log files starts to &ldquo;<strong>rotate<\/strong>&rdquo; once the disk space limit is reached, something like a LIFO (last-in, first-out) queue.<\/p><p>Circular logging is a feature of the <strong>Joint Engine Technology (JET)<\/strong> database, used by all versions of the Exchange Server that can be enabled or disabled by an administrator.&nbsp;In older versions such as Exchange Server 5.5 and earlier, circular logging was enabled by default However, with Exchange 2000 Server and continuing to Exchange 2010 and newer versions, it is disabled by default.<\/p><p>It is suggested that you should not enable circular logging on an Exchange database if you are doing backups as they will be inconsistent. This includes incremental backups as well. If you do however decide to enable it, then it is recommended to take a full back up immediately, after the databases have been mounted and you have disabled it again.<\/p><h3 class=\"wp-block-heading\">Circular Logging Considerations<\/h3><p>When you enable circular logging, check following points-<\/p><ul class=\"wp-block-list\">\n<li>When the database is not replicated, it employs <strong>JET circular logging<\/strong>. To enable or disable circular logging in this scenario, a <a href=\"https:\/\/www.stellarinfo.com\/blog\/mount-dismount-mailbox-databases-in-exchange-2019-2016-2013-via-powershell\/\" target=\"_blank\" rel=\"noreferrer noopener\">dismount and remount of the database<\/a> is necessary. However, if the database is replicated, it utilizes <strong>continuous replication circular logging (CRCL)<\/strong>. In this case, there is no need for the dismount and remount process when enabling or disabling circular logging.<\/li>\n\n\n\n<li>One should also consider that when enable circular logging, this might affect the backup as when enabled the service will not generate additional log files and instead it overwrites the files so that there is no build-up of transaction logs.<\/li>\n\n\n\n<li>When having a high availability setup, it is strongly not recommended to have circular logging enabled since the replication of the databases is based on log shipping and if a transaction log is missed and overwritten, it will cause huge inconsistency of data. As a result, when you enable the circular logging feature, the current log file isn&rsquo;t overwritten and closed log files are generated for the log shipping and replay process in case of high availability. When having circular logging enabled, apart from the backup process, one would need to consider the restorability of the databases in case of a disaster. Since the recovery would mean to replay the transaction logs, since logs will be overwritten, this would not be possible.<\/li>\n<\/ul><h2 class=\"wp-block-heading\" id=\"enabling-circular-logging-exchange-server\">Enabling Circular Logging Exchange Server<\/h2><p>This can be done by using both PowerShell and the <strong>Exchange Admin Center<\/strong> (EAC).<\/p><p><strong>Let us start with the EAC. Follow these steps:<\/strong><\/p><ul class=\"wp-block-list\">\n<li>Open the <strong>Exchange Admin Center<\/strong>. After logging in, open the databases window.<\/li>\n<\/ul><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"356\" height=\"321\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/09\/mailbox-database.png\" alt=\"Stellar\" class=\"wp-image-65061 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/09\/mailbox-database.png 356w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/09\/mailbox-database-300x271.png 300w\" sizes=\"auto, (max-width: 356px) 100vw, 356px\" \/><\/figure>\n<\/div><ul class=\"wp-block-list\">\n<li>In the <strong>Mailbox database properties<\/strong> under <strong>Maintenance<\/strong>, tick the <strong>Enable circular logging<\/strong> checkbox.<\/li>\n<\/ul><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"241\" height=\"81\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2020\/09\/warning.png\" alt=\"Stellar\" class=\"wp-image-65062 apply-gradient-on-post-images\"><\/figure>\n<\/div><ul class=\"wp-block-list\">\n<li>You will immediately be prompted that you would need to dismount and mount the database for the changes to take effect.<\/li>\n<\/ul><p>To enable circular logging by using PowerShell, you need to open the Exchange Management Shell and use the below command.<\/p><p><code>Set-MailboxDatabase -Identity &ldquo;database1&rdquo; -CircularloggingEnabled:$true<\/code><\/p><p>Alternatively, if you want to do it for all the databases, you can use the below command.<\/p><p><code>Get-MailboxDatabase | Set-MailboxDatabase CircularloggingEnabled:$true<\/code><\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"701\" height=\"153\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/09\/CircularloggingEnabled.png\" alt=\"\" class=\"wp-image-110425 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/09\/CircularloggingEnabled.png 701w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/09\/CircularloggingEnabled-300x65.png 300w\" sizes=\"auto, (max-width: 701px) 100vw, 701px\" \/><\/figure>\n<\/div><p>After the databases have been dismounted and remounted, it is strongly suggested to perform a full backup of your Exchange database.<\/p><h2 class=\"wp-block-heading\" id=\"use-circular-logging-without-backup\">Use Circular Logging Without Backup<\/h2><p>Let&rsquo;s now look at a scenario where the Exchange backups have not been taking place and the volume where the database is stored is filling up. Once you hit that specific backpressure threshold, then you risk the fact that the&nbsp;<a href=\"https:\/\/www.stellarinfo.com\/article\/solved-exchange-database-fails-to-mount.php\">Exchange Databases will not mount<\/a>.<\/p><p>If you are in this situation, do not just jump and enable circular logging so you can get rid of the log files to reclaim the space they have used. Instead, follow these steps: <\/p><ul class=\"wp-block-list\">\n<li>Firstly, make a copy of the log and database directory, if you need to restore the database from a backup and replay the logs.<\/li>\n\n\n\n<li>If you do not have them, you can end up with data loss. You must try recovering your Exchange database from the backup.<\/li>\n\n\n\n<li>If you are running a large environment and want to make use of Circular Logging in the long run, it is advised to have three copies of the data if you want to go backup-less with <strong>Exchange Native Data Protection<\/strong> <strong>(NDP)<\/strong>.<\/li>\n\n\n\n<li>The next thing is if you are running a <strong>Database Availability Group<\/strong> and you are on an Exchange version higher than SP1 for Exchange 2010, then you no longer need to dismount and mount the Exchange stores for this to take effect.<\/li>\n\n\n\n<li>You do not need to restart the <strong>Information Store Service<\/strong>. It takes a few seconds\/minutes to perform this.<\/li>\n<\/ul><p>However, if you still have a problem after enabling circular logging in Exchange, such as database dismount or Exchange database won&rsquo;t mount, then you need to look at a third-party&nbsp;<a href=\"https:\/\/www.stellarinfo.com\/edb-exchange-server-recovery.htm?utm_source=blog_post&amp;utm_medium=blog_link_bottom&amp;utm_campaign=enable_circular_logging_in_exchange_server\">Exchange Recovery<\/a>&nbsp;tool such as Stellar Repair for Exchange&nbsp;to repair the corrupt EDB file without the need for the log files.<\/p><figure class=\"wp-block-embed is-type-rich is-provider-embed-handler wp-block-embed-embed-handler wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"How to Export Recovered Mailboxes to Live Exchange Server?\" width=\"750\" height=\"422\" src=\"https:\/\/www.youtube.com\/embed\/QX4omQI2mb8?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure><p>The software can repair large .EDB files as well as multiple files, simultaneously. You can even open the offline .EDB file with the tool and just extract the data to another live database or Office 365 tenant, or even to a .PST file. The software supports all Exchange server versions such as <strong>2019, 2016, 2013, 2010, 2007, 2003 , 2000 &amp; 5.5<\/strong>.<\/p><h2 class=\"wp-block-heading\" id=\"faq\"><strong>FAQ<\/strong><\/h2>\n","protected":false},"excerpt":{"rendered":"<p>Circular logging allows Microsoft Exchange to overwrite transaction log files after the&hellip; <a class=\"more-link\" href=\"https:\/\/www.stellarinfo.com\/blog\/enable-circular-logging-exchange-server\/\">Continue reading <span class=\"screen-reader-text\">How to Enable Circular Logging in Exchange Server<\/span><\/a><\/p>\n","protected":false},"author":21,"featured_media":17754,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[25],"tags":[798],"class_list":["post-17748","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-exchange-server","tag-enable-circular-logging","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Enable Circular Logging in Exchange Server<\/title>\n<meta name=\"description\" content=\"Learn more about enabling circular logging in Exchange, this overwrites transaction log files. but remember without transaction log files, you cannot recover any data if backup is not available. 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