英文:
What Exactly Stale data mean ? How can we Handle this in Cache?
问题
什么是“过期数据”？我们如何在缓存中处理它？
我正在学习缓存，了解到了过期数据。我们如何处理它？如果不再使用过期数据，如何释放它？
有人能简要介绍一下吗？
英文:
What Exactly Stale data mean ? How can we Handle this in Cache ?
I'm going through Cache and found about stale data. How we can handle it?? How release the stale data if it is not being used?
Can someone brief about it ??
答案1
得分: 0
一旦将数据存储在缓存中，它就像数据的快照。如果数据发生更改，您必须清空缓存并重新加载数据。
可以将其类比为在体育赛事中拍摄朋友的照片。一旦活动结束，朋友离开，这张照片就会变得“陈旧”。它不再反映真实状态。
通常，当您知道数据已更改时，应清空缓存并让其重新构建以获取最新数据。
英文:
Once you store data in a cache, it's like a snapshot of the data. If the data changes, you must flush the cache and reload the data.
Think of it like taking a snapshot of your friends at a sporting event. Once the event is over and your friends leave, the snapshot is 'stale'. It no longer reflects the true status.
Typically, when you know the data has changed, you should flush the cache and let it build back fresh.
答案2
得分: 0
Stale Data: 缓存中的数据与主内存的数据不同步。
How to handle this issue: 如何处理这个问题：
- I understand from the definition that this occurs when the main memory is modified before cache. This is done when the processor accesses the data in main memory directly without accessing it from cache of our consideration.
我从定义中了解到，这种情况发生在主内存在缓存之前被修改时。这是因为处理器直接从主内存访问数据，而不是从我们考虑的缓存中访问数据。 - This occurs in the following scenario: When multiple processors are working on same word/data . These processors have different caches and do not share the caches, which causes this issue.
这种情况发生在以下情形下：当多个处理器在相同的单词/数据上进行操作时。这些处理器有不同的缓存，不共享缓存，这就导致了这个问题。 - The above can be resolved if the processors or cores which are working together have a shared cache.
如果一起工作的处理器或核心有共享缓存，上述问题可以得到解决。
I too would like some other scenarios where stale data can come into picture.
我也想知道一些其他情况下，可能会出现不同步数据的情况。
英文:
Stale Data: The data in cache is outdated with respect to the main memory.
How to handle this issue:
- I understand from the definition that this occurs when the main memory is modified before cache. This is done when the processor accesses the data in main memory directly without accessing it from cache of our consideration.
- This occurs in the following scenario: When multiple processors are working on same word/data . These processors have different caches and do not share the caches, which causes this issue.
- The above can be resolved if the processors or cores which are working together have a shared cache.
I too would like some other scenarios where stale data can come into picture.
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