Gather statistics and DDL for a database subset.

收集数据库子集的统计数据和ddl。

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Then each subset is flushed to the corresponding database.

然后每个子集被清仓到对应的数据库。

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Each subset is known as a database partition group.

每个子集称作一个数据库分区组。

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If we were justifying our expense as analogous to building a database of emails, then it was a database that only allowed you to access a tiny, randomly selected, subset each time it was used.

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The entire crowd-sourced database is too big to store on an iPhone, so we download an appropriate subset (cache) onto each iPhone.

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