Browse Definitions :
Definition

database availability group (DAG)

Contributor(s): Matt Gervais

A database availability group (DAG) is a high availability (HA) and data recovery feature of Exchange Server 2010. 

A database availability group, which can consist of up to 16 Exchange mailbox servers, automates recovery at the database-level after a database, server or network failure. 

Database availability groups replaced Exchange Server 2007’s high-availability model, which was based on local continuous replication (LCR), standby continuous replication (SCR), single copy clustering (SCC) and cluster continuous replication (CCR).

Exchange administrators can choose to use DAGs in different geographic locations and in many different architectural designs and configurations, making it considerably more flexible than previous high-availability setups.

NTFAQGuy explains how high availability features have evolved from Exchange Server 2003 through Exchange Server 2010 and at 4 minutes in, explains how Exchange database availability groups work.

This was last updated in July 2012

Continue Reading About database availability group (DAG)

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.

-ADS BY GOOGLE

File Extensions and File Formats

Powered by:

SearchCompliance

  • compliance audit

    A compliance audit is a comprehensive review of an organization's adherence to regulatory guidelines.

  • regulatory compliance

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

  • Whistleblower Protection Act

    The Whistleblower Protection Act of 1989 is a law that protects federal government employees in the United States from ...

SearchSecurity

  • brute force attack

    Brute force (also known as brute force cracking) is a trial and error method used by application programs to decode encrypted ...

  • spyware

    Spyware is software that is installed on a computing device without the user's knowledge. Spyware can be difficult to detect; ...

  • ATM black box attack

    An ATM black box attack, also referred to as jackpotting, is a type of banking-system crime in which the perpetrators bore holes ...

SearchHealthIT

SearchDisasterRecovery

  • business continuity and disaster recovery (BCDR)

    Business continuity and disaster recovery (BCDR) are closely related practices that describe an organization's preparation for ...

  • warm site

    A warm site is a type of facility an organization uses to recover its technology infrastructure when its primary data center goes...

  • 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 ...

SearchStorage

  • disk array

    A disk array, also called a storage array, is a data storage system used for block-based storage, file-based storage or object ...

  • enterprise storage

    Enterprise storage is a centralized repository for business information that provides common data management, protection and data...

  • optical storage

    Optical storage is any storage type in which data is written and read with a laser. Typically, data is written to optical media, ...

Close