What is DAC and how dac process work at backend?

What is DAC and how dac process work at backend?
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

AmitIT ArchitectCommented:
I guess you know why it is needed. If not, it is required to avoid split brain syndrome. You might have read it. Say your have Exchange DAG on two sites. Site1 and Site 2. Assume Site 1 goes down due to power outage, your WAN also goes down and you make Site 2 active by using alternate FSW. Now you fixed power issue on Site1 and server come back up, however your network still not fully up. In this case to avoid Site1 mounting its DB. DAC mode is enabled. When you enable it, DACP bit value is set to zero, in your site 1. Site 2 will have One value. Once your Site1 is able to restore connection with Site 2 Servers. Now you will be allowed to mount db in site 1 again.

Let me know, if that clears your doubt.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.