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The next two problems are practical problems illustrating how calculus can help in forecasting revenue generation in the one instance, and yield from a mining operation in the other instance The unique aspect of these problems is that they start not with a statement of revenue, but wt a statement of revenue rate, the revenue generated per year ih and the yield of the mine in tons per year Watch the way these problems are worded Don't be fooled on a test by misreading a rate statement

In this example, we used the AES encryption algorithm with a 128-bit key. In addition, 192- and 256-bit keys are supported, as well as Triple DES. Now that we ve created our DEK, we can encrypt the database:

-- Encrypt the database using Transparent Database Encryption (TDE) -- Encryption will proceed as a background task -- Use the sys.dm_database_encryption_keys DMV to check progress ALTER DATABASE [AdventureWorks2008] SET ENCRYPTION ON GO

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The encryption process will now start as a background task. During this time, some functions, such as modifying the database files and detaching the database, won t be available. The sys.dm_database_encryption_keys Dynamic Management View (DMV), fully described in BOL, can be used to inspect the progress of the encryption process. Finally, earlier we discussed the need to back up the certificate for recovery purposes and to enable encrypted databases to be restored to another server. Attempting to restore a backup of a TDE-encrypted database to another server that doesn t have the appropriate certificate installed will result in failure of the restore process, resulting in an error like that shown in figure 6.15. Let s take a quick look at the process of restoring a certificate on another server in preparation for restoring an encrypted database:

7- 2 1

Figure 6.15 Restoring a TDE-encrypted database on a server without the appropriate certificate will fail. CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'jGK__g6647##tR'; GO -- Restore the Certificate CREATE CERTIFICATE tdeCertificate FROM FILE = ' g:\cert\tdeCertificate.backup' WITH PRIVATE KEY (FILE = 'e:\cert\tdeCertificatePrivateKey.backup' , DECRYPTION BY PASSWORD = 'jjKiid_%%4-9'); GO

Now that the certificate is loaded on the new server, we can successfully restore backups of the TDE-encrypted database. Despite the clear advantages of Transparent Data Encryption, there are a number of restrictions to be aware of.

The key restrictions of TDE are summarized as follows: While data at rest is encrypted, data transmitted over the network is not, and as we saw earlier in the chapter, we can use SSL or IPSec to achieve this. TDE decrypts data as it s read into memory, meaning that if a person or process is able to access the memory contents of the server, the data could potentially be accessed in an unencrypted form. While the CPU overhead of TDE is moderate (Microsoft estimates a 3- to 5-percent overhead), it s a consideration nonetheless for systems close to CPU capacity. In large databases with only a small percentage of sensitive data, cell-level encryption (discussed shortly) may present a better alternative, The tempdb database will be automatically encrypted on a SQL Server instance in which any of the databases are encrypted with TDE. This is an important consideration in instances in which there are one or more databases that make heavy use of the tempdb database. FileStream data, covered in chapter 9, can t be encrypted with TDE. For a TDEencrypted database containing sensitive FileStream data, consider alternate means of securing such data. The new backup compression feature in SQL Server 2008 (covered in chapter 10) has minimal effects on databases encrypted with TDE, with a very low compression yield. For this reason, enabling backup compression on TDE-encrypted databases isn t recommended.

the rate of R ( f )= 2 0 0 0 - 5 t 2 where R is in dollars per year and t is in years As the machine ages the cost of repairs increases according to C ( t )= 500 + 2f2 How long is the machine profitable and what are the total earnings to this point in time

With these restrictions in mind, cell-level encryption may prove to be a better alternative in particular cases.

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