Query optimization is an important element of database manager system.

查询优化是数据库管理系统的一个重要组成部分。

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Query optimization was very important in database of super contain table.

在超大容量表数据库中，查询优化尤为重要。

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Query optimization was very important in database of super contain table.

在超大容量表数据库中，查询优化尤为重要。

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