Exchange Server 2013 Database Mounting Error

I got error message in exchange server Microsoft.Exchange.Data.Storage.MailboxOfflineException. So I try to watch my Exchange server database status and it's show me Active and Dismounted. I am trying to mount the database, but mount command not executed I got the error message. How to solve it?

Failed to mount database "Mailbox Database 0389974439". Error: An Active Manager operation failed. Error: The database action failed. Error: Operation failed with message: MapiExceptionDatabaseError: Unable to mount database. (hr=0x80004005, ec=1108) Diagnostic context: Lid: 65256 Lid: 10722 StoreEc: 0x454 Lid: 1494 ---- Remote Context Beg ---- Lid: 45120 dwParam: 0x2649A2 Lid: 57728 dwParam: 0x264A8D Lid: 46144 dwParam: 0x2650B7 Lid: 34880 dwParam: 0x2650B7 Lid: 34760 StoreEc: 0xFFFFFC06 Lid: 41344 Guid: b1f22c9b-393c-41a5-bc7c-0fc65a5dd783 Lid: 35200 dwParam: 0x3D40 Lid: 46144 dwParam: 0x265654 Lid: 34880 dwParam: 0x265654 Lid: 54472 StoreEc: 0x1388 Lid: 42184 StoreEc: 0x454 Lid: 1750 ---- Remote Context End ---- Lid: 1047 StoreEc: 0x454 [Database: Mailbox Database 0389964565, Server: xxxx.mydomain.com]

This page is the source of the answer, but I'll copy it here just in case...

1st check with eseutil /mh if database is not in clean shutdown, if not just run with /p switch to get it in clean shutdown

Once it come to clean shutdown state, then Try moving the checkpoint and logs to a temporary location and mount database to see whether it works.

Get-MailboxServer | select MaximumActiveDatabases

If the value shows as 0, then you need to change that:

Get-MailboxServer | Set-MailboxServer -MaximumActiveDatabases 1

The other thing you can do is try restarting the Microsoft Exchange Information Store process. The error (hex) above shows a DB lock, but that could be either the bug from RTM (if you are unpatched) OR something else locking it. Try that and see if it works.