Shulou(Shulou.com)06/02 Report--

The Mailbox server reserves 25% of the total RAM for the database cache.

Memory allocation in Exchange Server 2013 is based on the following:

1. Total memory

two。 Number of active databases

3. Number of passive databases

4. Maximum number of active databases

When you start the information storage service, a worker process and database cache are assigned to each database. The amount of RAM allocated to the database cache varies depending on the state of the active or passive database. The active copy of the mailbox database will use all allocated database caches. Passive database replicas use only 20% of the allocated database cache.

Let's use this example:

The server has 100G ram, and there are ten copies of the mailbox database, five active states, and five passive states on this server.

Because 25% of the available memory is allocated to the database cache, the total memory allocated to the database cache is 25 GB. This means that each database is allocated a database cache of 2.5 GB. Each passive copy uses only 20% of the allocated database cache; therefore, the passive database has a database cache of 512 MB.

If the passive copy is activated at any time, the database cache for that database replica will be changed from 512 MB to 2.5 GB.

`because the database cache is determined when the information storage service is started, the information storage service must be restarted when a new database is added to the Exchange server. (the requirement to restart the service after creating a new database is a new feature of Exchange Server 2013 and is a direct result of the new database cache allocation scheme. This includes creating a new database or adding a passive copy mailbox database. `

If the information storage service is not restarted and the new mailbox database is populated with a large number of mailboxes, performance problems may occur in the future *

The formula for calculating the memory size is as follows:

Active database cache allocated = (total server memory) × 25% / (number of max allowed active databases + [(total number of databases on a server)-(number of max allowed active databases)] × 20%)

If max allowed active database is not set, max allowed active databases = the total number of databases on the server.

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