How to change optimised hidden parameters in Oracle 10g.

Hello Gurus,
    SAP suggested me to change the following parameter values in Oracle database. But I am unable to make change in this parameter.
The parameters are mentioned as below.
Name
1> btree_bitmap_plans
2> sortelimination_cost_ratio
3> optimizermjc_enabled
I am unable to check the current values and chnge it to new value. So please suggest me the proper way to change this parameters.
Regards,
Jayendra.

Hello,
if you use an SPFILE you can use the following command:
alter system set "<underscore_parameter_name>" = <value> scope=spfile;
In case of init<sid>.ora you just specify the parameters in the file itself:
<underscore_parameter_name> = <value>
Regards
Martin

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Rem NAME
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