You should not create triggers on objects owned by SYS.

Oracle explicitly does not allow developers to put triggers on SYS data dictionary objects,

 because this could unintentionally modify the behavior of the database.

If an attempt is made to create a trigger on an object owned by SYS,

 Oracle generates the error "ORA-04089: cannot create triggers on objects owned by SYS."

From Oracle:

ORA-04089: cannot create triggers on objects owned by SYS
Cause: An attempt was made to create a trigger on an object owned by SYS.
Action: Do not create triggers on objects owned by SYS.

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