简述分布式数据库系统的目标。
①适应部门分布的组织结构,降低费用。②提高系统的可靠性和可用性。③充分利用数据库资源,提高现有集中式数据库的利用率。④逐步扩展处理能力和系统规模。评分参考]答对一个要点给1分,任答对3个要点给满分3分。
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