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I found in iOS simulator, there is a file named Cache.db in Library caches path.
There are some tables in the db:
sqlite3 Cache.db
SQLite version 3.7.5
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> .table
cfurl_cache_blob_data cfurl_cache_response
cfurl_cache_receiver_data cfurl_cache_schema_version
I want to know what does it do? And how can we make use of this db?
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Your iPhone's cache, a reserved location in your device that preserves temporary data, can help websites and apps load faster. However, it can eat up your storage as well, so if you want to clear your cache once and for all, we've got an easy, step-by-step tutorial on how to get rid of all the clutter.
Go to Settings > General > [Device] Storage. You might see a list of recommendations for optimizing your device's storage, followed by a list of installed apps and the amount of storage each one uses. Tap an app's name for more information about its storage. Cached data and temporary data might not be counted as usage.
Your iPhone holds two major data caches: One for Safari, and another for all the rest of your apps. Clearing these caches can free up space on your iPhone, improving speed and performance by removing unnecessary app data. Here's how to clear both caches on your iPhone.
Even though the App Store isn't a web page, it caches data so it loads faster, just like a web page. Clearing the cache in the App Store can help you make sure you have the latest, most up-to-date apps and updates in the App Store. There is a built-in way to clear the App Store cache–it just isn't obvious.
That is used by NSURLCache. It is automatically used when you create a NSURLRequest unless you specify that you do not want to use cache.
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