result cache失效

result cache not enabled for owner SYS and SYSTEM

You cannot cache results when the following objects or functions are in a query:

    Temporary tables and tables in the SYS or SYSTEM schemas

    Sequence CURRVAL and NEXTVAL pseudo columns

    SQL functions CURRENT_DATE, CURRENT_TIMESTAMP, LOCAL_TIMESTAMP, USERENV/SYS_CONTEXT (with non-constant variables), SYS_GUID, SYSDATE, and SYS_TIMESTAMP