When a difference exists between data types, a conversion from one type to another must take place at the driver or Driver Manager level, which involves additional overhead. The type of driver determines whether these conversions are performed by the driver or the Driver Manager. Driver Manager and Unicode Encoding on UNIX/Linux describes how the Driver Manager determines the type of Unicode encoding of the application and driver.The following sections discuss two basic types of data conversion in the DataDirect Connect for ODBC driver and the Driver Manager. How an individual driver exchanges different types of data with a particular database at the database level is beyond the scope of this discussion.
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