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Globalization Requirements and Capabilities
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Large database systems, and many small ones too, will usually have a user community that is distributed geographically, temporally, and linguistically Consider a database hosted in Johannesburg, South Africa, with end users scattered throughout sub-Saharan Africa Different users will be expecting data to be presented to them in Portuguese, French, and English, at least They may be in three different time zones with different standards for the formats of dates and numbers The situation becomes even more complex when the application is running in a three-tier environment: you may have a database in one location, several geographically distributed application servers, and users further distributed from the application servers It is possible for a lazy DBA to ignore globalization completely Typically, such a DBA will take United States defaults for everything and then let the programmers sort it out But this is putting an enormous amount of work onto the programmers, and they may not wish to do it either The result is an application that works but is detested by a portion of its users But there is more to this than keeping people happy: there may well be financial implications too Consider two competing e-commerce sites, both trying to sell goods all over the world One has taken the trouble to translate everything into languages applicable to each customer; the other insists that all customers use American English Which one is going to receive the most orders Furthermore, dates and monetary formats can cause dreadful confusion when different countries have different standards Such problems can be ignored or resolved programmatically, but a good DBA will attempt to resolve them through the facilities provided as standard within the database
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The data stored in a database must be coded into a character set A character set is a defined encoding scheme for representing characters as a sequence of bits Some products use the character sets provided by the host operating system For example, Microsoft Word does not have its own character sets; it uses those provided by the Windows operating system Other products provide their own character sets and are thus independent of whatever is provided by the host operating system Oracle products fall into the latter group: they ship with their own character sets, which is one reason why Oracle applications are the same on all platforms, and why clients and servers can be on different platforms
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A character set consists of a defined number of distinct characters The number of characters that a character set can represent is limited by the number of bits the character set uses for each character A single-byte character set will use only one byte per character: eight bits, though some single-byte character sets restrict this even further by using only seven of the eight bits A multibyte character set uses one, two, or even three bytes for each character The variations here are whether the character set is fixed-width (for example, always using two bytes per character) or variable-width (where some characters will be represented in one byte, other characters in two or more) How many characters are actually needed Well, as a bare minimum, you need upper- and lowercase letters, the digits 0 through 9, a few punctuation marks, and some special characters to mark the end of a line, or a page break, for instance A seven-bit character set can represent a total of 128 (27) characters It is simply not possible to get more than that number of different bit patterns if you have only seven bits to play with Seven-bit character sets are just barely functional for modern computer systems, but they are usually inadequate They provide the characters just named, but very little else If you need to do simple things like using box drawing characters, or printing a name that includes a letter with an accent, you may find that you can t do it with a seven-bit character set Anything more advanced, such as storing and displaying data in Arabic or Chinese script, will be totally out of the question Unfortunately, Oracle s default character sets are seven-bit ASCII or seven-bit EBCDIC, depending on the platform: even such widely used languages as French and Spanish cannot be written correctly in these character sets This is a historical anomaly, dating back to the days when these character sets were pretty much the only ones in use Eight-bit character sets can represent 256 (28) different characters These will typically be adequate for any Western European language based system, though perhaps not for some Eastern European languages, and definitely not for many Asian languages For these more complex linguistic environments, it is necessary to use a multibyte character set EXAM TIP The default character set is seven bit, either ASCII or EBCDIC If you use DBCA to create a database, it will pick up a default from the operating system This will often be better, but may not be perfect Unicode character sets deserve a special mention Unicode is an international standard for character encoding, which is intended to include every character that will ever be required by any computer system Currently, Unicode has defined more than 32,000 characters TIP Oracle Corporation recommends AL32UTF8, a varying-width Unicode character set, for all new deployments
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