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Oracle Database supports a reliable Unicode datatype through , depending on the setting of the national character set when the database is created.
These datatypes allow character data in Unicode to be stored in a database that may or may not use Unicode as database character set.
You must consider this issue when estimating space for tables with columns that contain character data.
The length semantics of character datatypes can be measured in bytes or characters.
For example, in a Unicode database ( column that can store up to five Chinese characters together with five English characters.
In byte semantics, this would require (5*3 bytes) (1*5 bytes) = 20 bytes; in character semantics, the column would require 10 characters.
A database column that stores Unicode can store text written in any language.For single byte character sets, columns defined in character semantics are basically the same as those defined in byte semantics.Character semantics are useful for defining varying-width multibyte strings; it reduces the complexity when defining the actual length requirements for data storage.Oracle Database users deploying globalized applications have a strong need to store Unicode data in Oracle Databases.They need a datatype which is guaranteed to be Unicode regardless of the database character set.
Numbers of virtually any magnitude can be stored and are guaranteed portable among different systems operating Oracle Database, up to 38 digits of precision.