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 the profile has not ever been released, or if it has been modified since the last release, then the release Label field will indicate that.
如果这个概要文件从没有被发布，或者如果它已经在最后发布后就已经被修改，那么ReleaseLabel区域将会表明出来。
Please make the changes only if no-one has modified the record since I read it.
请仅在从我读取该记录后没有人进行修改的情况下进行更改。
Therefore, a file such as December_Report.pdf is matched, even if it has not been modified since January.
因此，诸如december _ Report . pdf等文件是匹配的，即使它自从一月份以来还未修改过。
The browser sends the server an If-Modified-Since GET request in such scenarios, and the server can very efficiently return Not-Modified if nothing more recent is available.
在这种情况下，浏览器向服务器发送一个if -Modified - SinceGET请求，如果没有最近的内容可用，则服务器能非常高效地返回Not - Modified。
If the content hasn't changed since the time indicated in the If-Modified-Since header, the Google data service returns a 304 (Not Modified) HTTP response.
如果自if - Modified - Since标头中指示的时间后内容未发生更改，那么Google数据服务将返回一个304 (NotModified)HTTP响应。
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。
The client also reads the Last-Modified response header and sends back the date value in an If-Modified-Since header to ask the server if the resource has changed.
客户端还读取Last - Modified响应Header，并在if - Modified - Since Header中发回日期值，以向服务器询问资源是否已更改。
How does if-not-modified-since work?
if-not-modified-since的工作原理是什么?
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。
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。
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