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Restoring to a recovery database
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Figure 9-10 Making the recovered database known to Exchange.
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As you can see from Figure 9-10, Exchange will let you know that the recovery database can only be mounted if it is in a clean shutdown state. We ve already addressed this issue by running ESEUTIL to recover the database and put it into the desired state, so we can proceed. If we view databases through EMC, we can see that the recovery database has now appeared and can be managed in much the same way as any other database (Figure 9-11).
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Figure 9-11 The recovery database shows up in EMC.
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The next step is to mount the database, which can be done through EMS or EMC. Let s go with the shell:
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Mount-Database Identity 'DB3 Recovery Database'
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If you attempt to mount a database and some of its files are missing, Exchange will warn you that it can t locate some files and offer to go ahead and create a new database and mount it . If you allow Exchange to proceed, you ll end up with a beautiful new and completely empty database, which is what you want sometimes (as in the case of a dial-tone recovery), but not if you intended to restore a complete set of database and log files .
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When the database mounts, it creates a new checkpoint file and transaction log set to capture any changes made to the database while it serves in recovery mode. Now that the database is mounted, we can access it with some of the mailbox database cmdlets. For example, to discover the names of the mailboxes and the number of items that each mailbox holds in the database, we could use a command like this.
Get-MailboxStatistics Database 'DB3 Recovery Database' | Select DisplayName, ItemCount | Format-Table AutoSize
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DisplayName ----------------Pelton, David (HQ) Shen, Alan Shah, Niraj (China HQ) Online Archive - Redmond, Tony Camelbeke, Geert Akers, Kim Online Archive - Akers, Kim Smits, Guntars Redmond, Conor (IT) Shen, Paul (China HQ) Peled, Yael (IT) Solovay, Andrew Galway Conference Room Parker, Darren Redmond, Tony Simpson, David (Sales) Pais, Wilson SystemMailbox{3ef66f70-347f-4b1e-97ad-73e9ff908d0e}
ItemCount ------------74 41 37 126 11 100 7 31 43 39 26 30 17 20 1053 39 21 1
This information is useful because it tells us what is in the database. However, we can t use cmdlets such as Get-Mailbox to retrieve information about an individual mailbox in the recovery database. We have to use the Restore-Mailbox cmdlet to get information from a mailbox in a recovery mailbox and move it back into another online database where users can access the recovered data.
Restoring to a recovery database
Restoring mailbox data
Restore-Mailbox and New-MailboxRestoreRequest (introduced in SP1) are both interesting cmdlets that can be used in a number of different ways to merge information taken from a recovery database into a target mailbox in another database. The target mailbox must be connected to a user account. However, you can direct data taken from a mailbox in the recovery database and move it into a mailbox that has a different name in the target database. Merging means that Exchange doesn t overwrite messages that already exist in the target mailbox; the process is additive and nondestructive. The time required to scan a mailbox and recover items depends on the number of items in the mailbox, server configuration, and system load, but you should be able to scan several hundred items per minute. Exchange keeps you updated with progress as the scan proceeds (Figure 9-12).
Figure 9-12 Recovering items for a mailbox.
Among the options made available through Restore-Mailbox are the following:
Recover the data for all mailboxes discovered in the recovery database and restore them into an online database. For example, this command retrieves a list of mailboxes from the DB3 database and restores any mailbox found in the DB3 Recovery Database.
Get-Mailbox Database 'DB3' | Restore-Mailbox -RecoveryDatabase 'DB3 Recovery Database'
Recover the data for selected mailboxes from the recovery database and restore them into an online database. This example command restores the complete contents of the mailbox for a user called Simpson, David (Sales) from the recovery database. We ll include Confirm:$False to prevent Exchange from prompting us whether the command should proceed, as we think we know what we are doing.
Restore-Mailbox Identity 'Simpson, David (Sales)' RecoveryDatabase 'DB3 Recovery Database' Confirm:$False
Recover selected data from mailboxes in the recovery database and restore them to an online mailbox. For example, let s assume that user Kim Akers tells you that she has deleted a number of items that she can t recover from the dumpster, but she
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