If you need to wait on a blocking action — say, the results from a remote database query — it is not clear exactly how long you will need to wait for results to be available.

如果您需要等待一个阻塞操作—比如，对于来自远程数据库查询的结果—您不会确切地知道在可以使用结果之前究竟要等待多长时间。

youdao

However, the following query does not need an extra sort since the query access is limited to a single partition.

然而，由于下面的查询访问限制在单个分区上，因此不需要额外的排序操作。

youdao

However, in most cases, you do not need to perform query tuning manually.

尽管如此，大多数情况下，您不需要手工执行查询调优。

youdao

Originally, we thought it's information needs only; we just need to find a web page that contains the query word, but it's actually not.

起初，我们以为人们只是需要信息而已;,只需找到一个带有关键字的网页即可，但实际上并不是。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

If you want to run not one query but a thousand per second, you need very high throughput and higher efficiency in data processing.

FORBES: Big Data Meets Online Travel - 20 Billion Offers, One-Second Response Time