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5.5 Considerations when Choosing a Database Character Set
5.5.3 Effects of Character Set Conversion
If the database character set is different from the character set used by the client, character set conversion will occur. The possibility of data loss is not the only negative consequence; performance
may also suffer.
5.5.3.1 Data Loss
When data are converted from a character set that can represent a wide range of characters to
another with a narrower range, data loss can result.
Any characters that cannot be represented using the destination character set will be converted to a
replacement character. In US7ASCII, the replacement character is the question mark (‘?’).
5.5.3.2 Conversion Overhead
If all clients use the same character set, and the same character set is specified when a database is
created, no character conversion will occur.
However, if different character sets are in use on each client, and the database character set is a
superset of the character sets used by the clients, character conversion will occur.
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