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For Ingres, the Management Database is created as a Unicode Normalization Form C (NFC) database. This allows Unicode data to be stored and manipulated by defining columns as Unicode data types (that is, nchar, nvarchar, and long nvarchar).
If a Unicode collation name is not specified, the Unicode database is created with the default collation sequence “udefault.” The Unicode database created in this manner (createdb -n) uses NFC for normalization of Unicode strings for processing and storage. NFC results from the canonical decomposition of a Unicode string, followed by the replacement of all decomposed sequences by primary composites, where possible.
For more information, see section A1.2 of http://www.unicode.org.
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