Compared to commercial databases, network raw digital information resources are much richer in content.

相比于商业数据库，网络原生数字资源的内容要丰富得多。

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At present, many commercial databases have showed various degrees of realizing the function of query optimization.

目前的众多的商用数据库都不同程度的实现了查询优化功能。

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Also consider cost, because most commercial databases may have exponential license cost associated with adding to a per-account model.

还要考虑成本，因为大多数商用数据库在每次增加客户账户时都要进行授权，所以成本会呈指数级增长。

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Many of the largest firms tend not to report to commercial databases.

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In order to accomplish this, the FDA now has access to commercial databases that contain (non-patient-identifiable) information about the real-world use of marketed prescription drugs.

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Additions and corrections can take months to be added to the commercial databases, and each company that produces an app or device has its own timetable for offering updates.

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