What is the best pratice to providing RAM for Exchange2016(CU17)(Single Server)

Sathishkumar Singh 1 Reputation point

Hello Support

My Current Infra is Running 20GB Exchange2016(CU17)(Single Server)


Primary AD :-

Secondary AD:-

Child Domain:-






Total Mailboxes

User Mailbox:- 119

SharedMailbox:- 153

Two DBs:

DB01 (Main DB)



Memory is Occupied 19GB/20GB
SWAP Memory(Pagefile)

Allocated 21GB

Can you guide me how to avoid memory resource taking more


Do we need to increase the RAM?

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
3,864 questions
0 comments No comments
{count} votes

1 answer

Sort by: Most helpful
  1. Yuki Sun-MSFT 37,201 Reputation points

    Hi @SathishkumarSingh-6267,

    You can use the Exchange Server Role Requirements Calculator to help estimate the hardware requirements for your Exchange Server environment and check the recommended RAM configuration on the Role requirement page. Refer to the Readme article to learn how to use the calculator.
    Exchange Server Role Requirements Calculator

    Reference: Ask the Perf Guy: Sizing Exchange 2016 Deployments

    Besides, Exchange acts as a memory management system so it's absolutely normal for Exchange to grab as much RAM on the server as it can possibly get. For example, I have a single Exchange server 2016 (8GB RAM) in my test lab which has only 1 mailbox database with around 10 user mailboxes, this is how the task manager looks like at my end:

    That being said, if the recommended RAM returned by the calculator is close to 20GB as is in your current environment and this is not causing issues, personally I think you can just rest assured and leave it there.

    If an Answer is helpful, please click "Accept Answer" and upvote it.
    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.