Browse Definitions :
Definition

circular logging

Contributor(s): Stan Gibilisco

Circular logging is a method of conserving hard disk space in the Microsoft Exchange transactional logging process. It works by overwriting individual log files to keep the transactional log (the set of all log files) from expanding without limit on the hard disk.

When circular logging is disabled, every single 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, however, the transactional log can only grow to one megabyte (1 MB) in size. After that limit has been reached, the first log file is overwritten automatically to keep the transactional log database from growing any larger. The term "circular" arises from the fact that the set of log files starts to "rotate" once the disk space limit is reached, something like a LIFO (last-in, first-out) queue.

Circular logging is commonly used with Exchange native data protection, because in that mode, backups are not made so a detailed transactional log is not necessary. Circular logging is disabled by default in Exchange 2010. That's because, if circular logging has been enabled and the database becomes corrupted or otherwise compromised, it cannot be completely recovered if data has been added more recently than the time that the last full backup was created.

Circular logging is an artifact from old versions of Exchange that were released when hard disks were much smaller than they are today. Contemporary hard disks have more than enough space to run Echoing with circular logging disabled. The only reason to enable it would be when a hard disk is nearly full.

This was last updated in March 2013

Continue Reading About circular logging

Join the conversation

1 comment

Send me notifications when other members comment.

Please create a username to comment.

With Circular Logging DISABLED, log files will ALWAYS be 1MB in size and the number of log files NOT the size itself will keep increasing. So you will have lots and lots of 1MB size log files unless you backup successfully which will then be committed to the DB and logs will be purged.
Cancel

-ADS BY GOOGLE

File Extensions and File Formats

Powered by:

SearchCompliance

  • compliance framework

    A compliance framework is a structured set of guidelines that details an organization's processes for maintaining accordance with...

  • regulatory compliance

    Regulatory compliance is an organization's adherence to laws, regulations, guidelines and specifications relevant to its business...

  • privacy compliance

    Privacy compliance is a company's accordance with established personal information protection guidelines, specifications or ...

SearchSecurity

SearchHealthIT

  • telemedicine (telehealth)

    Telemedicine is the remote delivery of healthcare services, such as health assessments or consultations, over the ...

  • Project Nightingale

    Project Nightingale is a controversial partnership between Google and Ascension, the second largest health system in the United ...

  • medical practice management (MPM) software

    Medical practice management (MPM) software is a collection of computerized services used by healthcare professionals and ...

SearchDisasterRecovery

  • disaster recovery (DR) test

    A disaster recovery test (DR test) is the examination of each step in a disaster recovery plan as outlined in an organization's ...

  • business continuity plan (BCP)

    A business continuity plan (BCP) is a document that consists of the critical information an organization needs to continue ...

  • disaster recovery (DR)

    Disaster recovery (DR) is an area of security planning that aims to protect an organization from the effects of significant ...

SearchStorage

  • kilobyte (KB or Kbyte)

    A kilobyte (KB or Kbyte) is a unit of measurement for computer memory or data storage used by mathematics and computer science ...

  • megabytes per second (MBps)

    Megabytes per second (MBps) is a unit of measurement for data transfer speed to and from a computer storage device.

  • zettabyte

    A zettabyte is a unit of measurement used by technology professionals and the general public to describe a computer or other ...

Close