Would moving a mailbox to its own database improve performance?

Question

This answer suggests moving a large mailbox (50 gb) to a new Exchange database. Will that improve performance, such as moving mail from one folder to another and will it improve search speed?

You ought to start by trying to narrow down the source of the performance problem. Don't randomly make changes in the hopes that they'll fix your problem. What does `Get-MailboxDatabaseCopyStatus` say about the Content Index state? What are the results of `Test-ExchangeSearch`? Have you run a performance baseline check with the BPA? — joeqwerty, Feb 10 '15 at 15:46
@joeqwerty CopyQueue length = 0, ReplayLength = 0, SearchTime in Seconds = 2,355 — jao, Feb 11 '15 at 08:10
Is the search time 2,355 as in two thousand three hundred fifty five? — joeqwerty, Feb 11 '15 at 11:27

score 1 · Accepted Answer · answered Feb 10 '15 at 12:55

Moving a large mailbox to a different database will only increase performance if the destination database exists on either a different server, or different disk to the source database.

In virtualized environments connected to a SAN, sometimes moving the mailboxes to a database that resides on a different disk may not have a performance benefit because the data may exist on the same physical disk in the storage array.
To get around this, you might consider creating an exchange database on a disk that exists on a different SCSI bus, or a different LUN.

Would moving a mailbox to its own database improve performance?

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