How to make oracle is case insentive ( not case sensitive)

SqlServer by default is NOT case sensitive (data content) while Oracle by default is case sensitive (data content).
please help me to give the solution
How to make oracle is case insentive ( not case sensitive)
if there is anyway to make Oracle behave like SqlServer changing NLS settings or any other Oracle settings?
I have solution for application level . it is working fine
Possible solutions:
1. You want to store data case insensitive: do an 'insert...
values(upper('Abcd'))...'.
This will put your data in upper case into the tables.
2. Your data will be mixed-case and you want to select them case
insensitive:
create 'function based indexes' on every column you want to use in
your where-clauses.
Then 'select ... where <column_name> = 'ABCD'.

What version of Oracle? Oracle 10g has a capability that can toggle this feature on and off at the session level. Prior versions do not.
For prior versions you usually have to make use of the upper and/or lower functions in your queries. Sometimes a function based index, FBI, is used to handle this.
HTH -- Mark D Powell --

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