Incremental building means that only those files that have been modified since the builder was last called will be processed.
增量构建意味着：只有自上一次调用构建器以来被修改的文件才会被处理。
In simple terms, a cache entry is considered to be valid if the entity has not been modified since the Last-Modified value.
简单来说，如果实体值在Last - modified值之后没有被更改，则认为该缓存条目有效。
Listing 6 shows a header request specifying that only data that has been modified since November 11, 2003 be sent back from the server.
清单6显示了一个指定只有自2003年11月11日以后修改的数据才送回服务器的头。
If new indexes have been created, and the corresponding table has not been modified since the last RUNSTATS execution, then you can collect catalog statistics on indexes only.
如果创建新的索引，而在最后一次执行RUNSTATS以后还未修改相应的表，那么您可以只收集索引上的目录统计信息。
If something has been changed or modified since it was created, verifying that the changes are legitimate.
如果数据在产生之后被改变了，应该确认这些改变是合法的。
When you save changes made to tables, table Designer verifies that the database has not been modified since you last saved changes.
当您保存对表作出的更改时，表设计器将验证自您上次保存更改以来数据库没有被修改过。
How does if-not-modified-since work?
if-not-modified-since的工作原理是什么?
How does if-not-modified-since work?
if-not-modified-since的工作原理是什么?
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