GAE数据存储对发出的任何查询使用索引。

The GAE datastore leverages an index for any query issued.

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对合适的查询主题添加jobs查询主题，选择id列，并将基数设置为1 . .。

For the right query subject, add the JOBS query subject, select the ID column, and set the cardinality to 1..

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当这个mqt刚创建且还没有发出REFRESH table语句的时候，对它的查询将返回一个错误。

A query against this MQT right after it was created, but before the REFRESH TABLE statement was issued, returns an error.

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