but above all that we don't know if we have all the necessary information...but above all that we don't know if we have all the necessary information in the cache for fulfilling the query.什么意思?above all 怎么理解?

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but above all that we don't know if we have all the necessary information...
but above all that we don't know if we have all the necessary information in the cache for fulfilling the query.
什么意思?
above all 怎么理解?

首先 长篇大论的起始词.但首先,我们不知道我们是否有所有必要的信息来完成这次问询.