#How
This video will teach you how to clear your phone's cache, which can help speed up your phone and clear up memory space.
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Cached data is some data your computer/phone/whatever once worked very hard for (loaded over a potentially slow network, or had to use a lot of CPU on, or even had to read from the disk). It is stored somewhere faster than whatever was used to get/create it first. So if a file on your disk is cached it isn’t cached on your disk, it is cached in your memory. If a file from the network is cached it could be cached in memory or your disk (or both).
Computers have lots of different caches. Lots. Even things you might think of as “fast” like the RAM in your computer are actually slow enough that your CPU has a cache for RAM values. Programs frequently have multiple caches for various things. The operating system caches disk files in RAM, and frequently provides things that cache web pages in RAM and/or disk.
Any cached data “should” be something that can be created or fetched again. In some cases it actually can’t, for example, if you have a picture from a web page cached and for some reason the cache is cleared when you have no network, you can’t get that image back until the network comes back…or the web page may have changed in which case the value can never come back.
Some caches have built-in methods to keep them from getting stale (like if a web site changes a picture every day you don’t want to look at last month's picture just because it is “faster”). This is actually one of the harder problems in computer science (cache invalidation). Lots and lots of policies exist. Some common ones are “throw away old stuff”, “ask the web site/file system/whatever if the thing has changed”, and a personal favorite “who cares”.
So “in theory” throwing away a cache can’t cause a problem…and can’t fix one either. Except in the real world the cache invalidation policy could be wrong, and old data is cached and now stale, clearing the cache will fix that (woot!). In the real world the data may also be “now stale” but can’t currently be refetched, so clearing the cache will expose a problem (boo!).
Clearing a cache will also cause the thing to be slower while things that were once in the cache and you need again are computed/fetched/whatever again
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