Designing and setting up a new database system can take a lot of planning. But typically, one important decision is overlooked: choosing the right character set. A basic consideration for choosing a character set is to make sure it can handle any language that needs to be supported immediately and in the future. Oracle has documentation on the capabilities and performance implications of different character sets (Choosing a Character Set). Sometimes you have to change the database character set to support a new application.
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The Character Set Scanner