The entire crowd-sourced database is too big to store on an iPhone, so we download an appropriate subset (cache) onto each iPhone.
整个众包数据库太大，不能存放在iPhone上，所以我们在每部iPhone上下载了它的一个合适子集(即缓存)。
If your object has many properties, as for a big legacy table, you may need to turn on this feature along with "dynamic-update" to avoid too much database update overhead.
如果对象的属性较多，例如是一张大的遗留表，那你应该开启该特性，和“dynamic - update”结合使用以避免太多数据库更新开销。
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