Such tables:Ĭannot contain CLOB columns, unless the current database character set is multibyte.Ĭan contain only character columns with internal application codes, yes/no flags, credit card numbers or other data known to contain only basic ASCII characters. There is a very large table in the database, with terabytes of data, which – you are absolutely sure – contains no convertible data. You want to avoid converting the column so that the applications may continue to access the data in a pass-through configuration. You cannot migrate the column to a binary data type ( RAW, LONG RAW, or BLOB), because you are unable to modify applications accessing the database, for example, because they are not developed in-house. There is a character column in the database that contains binary data. You need to solve a problem of multiple character sets in a single column (see " Working with Multilingual Columns"). In some situations, you may want to exclude selected columns or tables from scanning or conversion.
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