oracle - ORA-02065: illegal option for ALTER SYSTEM -

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i'm new oracle. learning backup , recovery. that, did

$ sqlplus system/password

sql> alter system set db_recovery_file_dest_size=8gb scope=both;

but got error error:-enter image description here

can tell me exact solution? please tell me specific solution steps do.

$ sqlplus system/password

sql> alter system set db_recovery_file_dest_size=8g scope=both;


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