Is it possible to set group separator of decimal number in oracle for every session?
To alter group separator of decimal number in oracle I use

    ALTER SESSION SET NLS_NUMERIC_CHARACTERS = '.,';

But ALTER SESSION means that this will for only for current connection. I've tried only `SET NLS_NUMERIC_CHARACTERS = '.,';` but got no effect and `ALTER SYSTEM` also didn't work
So the question is: how to set NLS_NUMERIC_CHARACTERS for every session? 

Thanks.
Is it possible to set group separator of decimal number in oracle for every session?
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To alter group separator of decimal number in oracle I use

    ALTER SESSION SET NLS_NUMERIC_CHARACTERS = '.,';

But ALTER SESSION means that this will for only for current connection. I've tried only `SET NLS_NUMERIC_CHARACTERS = '.,';` but got no effect and `ALTER SYSTEM` also didn't work
So the question is: how to set NLS_NUMERIC_CHARACTERS for every session? 

Thanks.