【多选题】
A <{p}>They can be gathered by the DBMS_STATS package<{br/}><{/p}>
B <{p}>They provide real-time data about
schema objects.<{/p}>
C <{p}>They are gathered by the SQL Tuning Advisor.<{/p}>
D <{p}>They are
ignored by Optimizer if they are stale.<{br/}><{/p}>
E <{p}>By default, they are automatically gathered by a maintenance job.<{/p}>
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