Release 10.1A: OpenEdge Data Management:
DataServer for ODBC

ODBC data-source limits

ODBC data sources generally have upper limits on various components; for example, the number of columns per table, the number of columns per SELECT statement in a view, the maximum size of a data row, and the maximum length of character data types. These ODBC data-source-specific restrictions might affect how OpenEdge applications run and port to various data sources. See your data-source documentation for full details.