Originally Posted by
rtnataraj
Changing the Database Character Set of an Existing Database
Database character set migration has two stages:
1. Data scanning -- can identify number of schema objects where the column widths need to be expanded and the extent of the data that does not exist in the target character repertoire (range). This information helps to determine the best approach for converting the database character set.
2. Data conversion -- ensure if the database does not contain any of the inconsistencies described in "Character Set Conversion Issues"
Also refer.
Doc ID: 261871.1 Changing EL8ISO8859P7 to EL8MSWIN1253