Upgrade user database with the updated schema.

用更新的方案来升级用户数据库。

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Step 1: Initialize the user database and model.

步骤1：初始化用户数据库和模型。

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In this example, the user database is called notebook.

在这个例子中，用户数据库称作笔记簿。

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The company says it is simply keeping a database of Wi-Fi hotspots and cell phone towers near the user's location.

VOA: special.2011.05.02

The site should benefit as a growing user database and content expansion drives greater user engagement.

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The strategy also involves leveraging the user database of competitors, like Facebook.

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How fast can it grow if Google adds its skills at ad sales, email (gmail) use, user database analytics, networking connections and technology wizardry?

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