Loading using oracle extenal tables

Hi All,
I need some clarification regarding oracle external tables .
1) What is the syntax of creating an external table if the input file is of UTF-16 big-endian ??
2) I have seen some sample for external table ..where we will mention location of the input file as LOCATION ('foo.dat')) and also we will mention directory to look into it as DEFAULT DIRECTORY def_dir1
is it mandatory that these directory should be present in DB server ?? . I mean server in which oracle is installed .
Oracle version is 10gR2.
Thanks in Advance .

is it mandatory that these directory should be present in DB server ?? . I mean server in which oracle is installed .Yes, the directory (& files) must be "local" to Oracle.

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>
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>
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>
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Loading using oracle extenal tables

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