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The X$ tables are owned by the SYS database user and are read-only, which is why they are referred to as fixed tables and the V$ views are referred to as fixed views. This statement might be a juicy invitation for you to try to verify this read-only property. Any attempt to alter these tables with a DDL or DML statement is met with an ORA-02030 error.

Only SYS can query the X$ tables, they cannot be granted.  However, you can create view on them and grant the view.
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