过于陈旧的产业都承受着巨大的压力。
它为管理员适当地设置UNDO_RETENTION提供建议，以避免快照过于陈旧的问题。
It advises administrators in setting UNDO_RETENTION appropriately to avoid the age-old 'snapshot too old' problem.
条目过期失效 — 各条目均有一个有效的期限以便针对此键存储的信息在过于陈旧时可从缓存中清除这些条目。
The item is expired — Individual items can have an expiration to allow them to be flushed from the cache when the information stored against the key is likely to be too old.
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