如果数据库中的更新不频繁，则可以使用 DIH进行夜间增量导入很容易，这是人们使用Solr的典型方式（即，不是其数据的主要存储）。还有一些人使用Solr作为他们的主要存储，但这是更不频繁，虽然当 4.0 发布后，它包含了一些改进，使其更易于使用。

If your updates in the db are infrequent, then doing a nightly delta import with DIH is easy, and it's the typical way people use Solr (that is, not being the primary store for their data). There are some people that use Solr as their primary store too, but that is much more infrequent, though when 4.0 was released it contained some improvements that makes it easier to use it that way.