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Before looking at the character data types, let s look briefly at the background behind the ANSI and Unicode encodings To handle the wide variety of languages in the world, computer technologists needed a way to store the many different characters of a language in a standard format So, the ANSI standards body developed an encoding standard that required eight bits to represent the range of letters The only problem was that every character could not be specified within a single eight-bit encoding Thus, dozens of character sets were created that specified the acceptable characters for a given encoding This approach worked well until you started transferring data between systems that used different character sets If a character in one encoding did not exist in a different encoding, it was lost in the translation process In addition to the encoding-translation issues, the eight-bit encoding couldn t capture several languages.

A function that operates on sets of rows instead of on individual values. such as notifying an operator or executing a job.

Another protocol used for VPN traffic, Layer2 Tunneling Protocol/Internet Protocol Security (L2TP/IPSec), requires three sets of packet filters. This type of VPN uses UDP ports 500 and 4500 to create and maintain the connection, and IP protocol 50 to send data. VPNs, PPTP, and L2TP/IPSec are all discussed in more detail in 10. To learn of other port numbers associated with various TCP/IP services, see Lesson 1 of 2, Understanding TCP/IP.

These problems led to the creation of the Unicode standard The Unicode standard uses 2 bytes to represent each character This extra space meant that all the character sets in use in the ANSI standard could be eliminated Now, each unique character could be expressed within a single encoding schema And because with Unicode there s just one encoding scheme, no encoding translation is necessary when transferring data between systems set for different languages This makes character data completely transportable The only downside is that Unicode data types require two bytes to store each character, so Unicode data types require twice as much space as their ANSI counterparts Unicode data types are preceded with an n For example, nchar is the Unicode counterpart to the char data type, which uses the ANSI encoding.

As you can see from Table 16-1, installing AD RMS in a production environment is not a trivial matter.

To encrypt and decrypt data, you can use the EncryptByAsmKey function and the DecryptByAsmKey function, respectively.

When defining a character data type, you specify the maximum number of bytes the column is allowed to store For example, a char(10) can store a maximum of 10 characters because each character requires one byte of storage, whereas an nchar(10) can store a maximum of five characters because each Unicode character requires two bytes of storage Table 3-6 lists SQL Server character data types..

The skills that you need to successfully master the Managing and Implementing Disas ter Recovery objective domain on Exam 70-290: Managing and Maintaining a Microsoft Window Server 2003 Environment include

For more information about the Set-MailPublicFolder cmdlet and the full syntax of Set-MailPublicFolder commands, search for Set-MailPublicFolder in Exchange Server 2007 Help or access http://technet.microsoft.com/en-us/library/bb123707.aspx.