Although Lucene is a search index, and not a database, if your fields are reasonably small, you can ask Lucene to store them in the index.

虽然Lucene是一个搜索索引而非一个数据库，但是如果这个字段相当小，你可以让Lucene把它们存在索引里面。

youdao

We will use the DB2 Design Advisor and ask DB2 for an appropriate new index on the ORG or STAFF table to improve the performance of this query.

我们将使用DB 2 Design Advisor，让DB 2在ORG或staff表上创建适当的新索引，从而改进这个查询的性能。

youdao

In other words, you can ask the server, "give me all annotations of resource x," and it will use the index to provide a quick response.

换句话说，可以请求服务器“把与资源X相关的所有注解给我”，服务器会使用索引提供快速响应。

youdao

You may ask yourself why that would matter, since if it tracks its index properly each day, it should work over any extended period of time.

FORBES: Why Leveraged ETFs Don't Always Boost Returns

And the reason I ask this question is, I was reading earlier today that the consumer confidence index is down almost to the lowest point this year in the last September reading.

WHITEHOUSE: Discussing the Economy in Richmond