Google Caching ?

[oliver321]

How often does Google caches a website and why doesn't my submitted articles get cached ?

[convergent]

How often does Google caches a website and why doesn't my submitted articles get cached ?

It's upon Google
Basically it depends on your site promotion rate, niche (good news websites are checked at once) and so on.
Suppose your site is not so nice for Google at the moment

[allenhill]

Google Cache is nothing but a snapshot or a copy of a page stored by Google as a back-up. Google usually takes a snapshot of each page it examines and caches or stores that version as a back-up. The cached version is what Google uses to judge if a page is a good match for our query. Google’s servers are typically much faster than many web servers, we can often access a page’s cached version faster than the page itself.

[Sturatwilliam]

It basically depends on the Google but if you want to set custom crawl rate then it can be done via Google webmaster tool and update the content of the website if you are looking for fast cache as Google always prefer fresh content. 

[kormeysin]

Just like what Convergent has said "it's up to Google" to determine your crawl rate, and Google webmasters tool has custom setting for your crawl rate, but you shouldn't play around with that unless you want to slow Google's crawl rate down, this could happen if you have extremely busy website which Googlebot maybe slowing down your server resources with its http requests.
Articles or even some website's have been decached by Google lately, this could be something that is here to stay. How to avoid it?
Provide useful content, whether it is articles, or even blog posts etc, and make sure the content isn't thin content.

[webcreations]

Google takes a snapshot of each page it examines and caches (stores) that version as a back-up. The cached version is what Google uses to judge if a page is a good match for your query. Practically every search result includes a Cached link. Clicking on that link takes you to the Google cached version of that web page, instead of the current version of the page. This is useful if the original page is unavailable because of:
The owner’s recently removing the page from the Web
Sometimes you can access the cached version from a site that otherwise require registration or a subscription.
Note that Google’s servers are typically faster than many web servers, you can often access a page’s cached.