Can we change the DB character set at session level

hi,
Please help me
when iam giving the alter session command iam getting the error:
SQL> ALTER SESSION set NLS_CHARACTERSE
T =WE8MSWIN1252;
ALTER SESSION set NLS_CHARACTERSET =WE8MSWIN1252
ERROR at line 1:
ORA-00922: missing or invalid
i need to enter Arabic names in using the xml file.
here i have two questions
1)is it is possible to set character set at session level. because my client is not allowing to bounce the database. DB version is 10.2.0.4
Right now my DB is in US7ascii
2)is this "WE8MSWIN1252" set supports Arabic.
Regards,
Naresh

You cannot change the characterset at the session level. If you want to store ARABIC characters in your database then you should change the characterset of your database to any other characterset that supports Arabic characters or to a Unicode characterset like UTF8 or AL32UTF8.
If you try to insert Arabic characters with your present US7ASCII charancterset then the characters would be stored as junk.

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