The major task of on-line operational database systems is to perform on-line transaction and query processing.

联机操作数据库系统的主要任务是执行联机事务和查询处理。

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The major task of on-line operational database systems is to perform on-line transaction and query processing.

联机操作数据库系统的主要任务是执行联机事务和查询处理。

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