Over time, the operating system Android accumulates a significant number of temporary files that can slow down the device. In version Android 9, also known as Pie, Google engineers have slightly changed the memory management logic, which sometimes confuses users accustomed to previous interfaces. Clearing the cache is one of the most effective procedures for eliminating freezes and speeding up the loading of applications without the need to reset the settings to factory settings.
Many users mistakenly believe that the cache is garbage that needs to be deleted daily, but this is not entirely true. Cached data allows a app to start faster by saving temporary resources, but too much of it does lead to conflicts and errors. In this article, we will look in detail at how to properly and safely delete these files manually without affecting your personal information, photos or contacts.
What is the cache and why it needs to be cleared on Android 9
The cache is an area of memory where temporary application data is stored for quick access in the future. When you open a browser, social network or game, the system saves interface elements, images and scripts so that it does not have to download them again from the Internet the next time you launch it. This significantly saves traffic and CPU time, making your smartphone experience smoother.
However, over time, the size of these temporary files can grow to gigabytes, taking up precious space in the internal storage. On Android 9 memory management algorithms work differently than in older versions, and sometimes the system cannot automatically free up space when it is critically needed. In such cases, manual intervention becomes the only way to restore the device to its previous performance.
It is worth understanding the difference between clearing the cache and clearing the data. If you select the "Clear data" option, the application will return to the state immediately after installation, losing all your logins, settings and progress. Clearing only the cache is safe and deletes only temporary files, forcing the application to recreate them the next time you start it.
⚠️ Attention: Do not confuse the "Clear cache" button with the "Clear data" button in the application settings menu. The second option will delete all your history and app settings.
Preparing the smartphone for the cleaning procedure
Before you begin deep cleaning the system, it is recommended to perform several preparatory steps. This will help avoid accidental loss of important data or disruption of critical services. Although the procedure is safe, following a certain algorithm of actions guarantees the stability of the OS after a reboot.
First of all, make sure that you have access to the device settings and you know the screen unlock password. In some cases, after mass clearing the cache, the system may request re-authorization in your Google account or other services. It is also worth closing all applications running in the background so that files are not blocked by the writing process.
If your device has very little free memory (less than 500 MB), the cleaning process may take longer than usual. In this case, RAM may be overloaded and the system will run slower during file deletion operations. Give the phone a couple of minutes to rest after completing the procedure.
☑️ Preparing to clear the cache
Clearing the cache of individual applications through settings
The most reliable and controlled way to delete temporary files is to work with each application separately through the system menu. The Android 9 path to these settings is standardized, but may differ slightly depending on the manufacturer's shell (for example, MIUI, OneUI or EMUI). This method allows you to specifically free up space occupied by the heaviest apps.
First, go to the main settings menu and find the section responsible for managing apps. Most often it is called "Applications" or "Applications and Notifications". Here you will see a complete list of installed software. Select the application that takes up the most space (often browsers, instant messengers or social networks) and click on it.
In the application information menu that opens, find the “Storage” or “Memory” section. This is where the system shows detailed statistics on space usage. You will see two main buttons: one to clear the cache and another to clear the data. Click on the button Clear cacheto delete temporary files.
- 📱 This procedure is safe for all types of applications, including banking clients and instant messengers.
- 🗑️ The size of the freed up space can vary from several megabytes to gigabyte.
- ⚡ After cleaning, the application may take a little longer to load when first launched, as it will form a new cache.
Repeat this procedure for all resource-intensive applications. Particular attention should be paid to the browser Chrome, YouTube and Instagram, as they tend to accumulate huge amounts of graphic content. Regularly checking these sections will help keep your smartphone in good shape.
Sort apps by size in the settings menu to quickly find those that take up the most space and need to be cleaned first.
Using maintenance mode and built-in utilities
In Android 9, Google has introduced and improved built-in optimization tools that can perform mass cleaning without having to go into the settings of each application separately. These utilities are often called Files, Device Maintenance, or Optimizer. They analyze the system and offer to delete unnecessary files with one click.
Find on the desktop or in the application menu an icon called “Files” (Files by Google) or a similar system application. Launch it and go to the Cleaning tab. The system will scan your memory and offer to delete “Temporary Files” or “Application Cache”. This is the fastest method for users who do not want to understand the technical details.
It is important to note that the built-in utilities are sometimes more aggressive than manual cleaning and may suggest deleting download files or old screenshots. Carefully study the list of what is proposed to be deleted before confirming the action. You can deselect (uncheck) those categories of files that you want to save.
| Cleaning method | Working speed | Security | Cleaning depth |
|---|---|---|---|
| Manual (via settings) | Low | High | Spot |
| Built-in utility | High | Medium | Shallow |
| Recovery mode | Medium | High | Full (system cache) |
| Third-party applications | High | Low | Deep |
Using standard system tools is preferable to installing third-party software, which itself can consume resources. Built-in algorithms Android 9 are smart enough to identify files that are safe to delete without compromising the integrity of the system.
Clearing the system cache through the Recovery menu
There is another level of cleaning available to advanced users - deleting the cache partition through the recovery menu (Recovery Mode). This method clears temporary files of the operating system itself that are not deleted by normal methods. This is especially useful if the phone is unstable after updating the firmware.
To enter this mode, you must turn off the smartphone completely. Then you need to hold down a certain key combination (usually the power button plus the volume down button, but on different models Samsung, Xiaomi or Huawei combinations may differ). Hold the buttons until the logo or menu with a text interface appears.
In the Recovery menu, navigation is carried out with the volume buttons, and the selection is confirmed with the power button. Find item Wipe cache partition. Be extremely careful: do not confuse this item with Wipe data/factory reset, which will delete all your personal data. The choice should be made strictly in favor of clearing only the cache partition.
⚠️ Attention: Entering Recovery mode and incorrectly selecting a menu item may lead to the loss of all data or the need to flash the device. Proceed strictly according to the instructions for your model.
After confirming your choice, the system will clean the hidden partition. This process may take from a few seconds to a couple of minutes. When finished, select Reboot system now to restart the phone in normal mode. The first launch after this procedure will take longer than usual.
What to do if the Recovery menu does not appear?
If the standard button combination does not work, try connecting the phone with a cable to the computer before turning it on (relevant for new Samsung models) or look for a specific combination for your brand on the Internet.
Frequent mistakes and myths about clearing memory
There are many misconceptions around the topic of Android optimization that can do more harm than good. For example, there is a myth that constantly clearing the cache extends the life of the battery. In fact, frequent cache deletion forces the processor to work harder to re-generate files, which can even increase energy consumption.
Another common mistake is the use of aggressive third-party “task killers” and cleaners that promise to speed up the phone significantly. In reality Android 9 it perfectly manages RAM on its own, and forcing processes to close only prevents the system from using resources efficiently. Often such applications themselves are a source of advertising and data collection.
Also, users often try to clear the cache through file managers, manually deleting folders with names like cache or temp in the root of memory. Doing this is strictly not recommended, as you can delete system logs or temporary files necessary for the current session to work correctly, which will lead to errors.
- 🚫 Do not install more than one application for cleaning to avoid conflicts between them.
- 🔄 Do not clear the cache more than once a month without a good reason (for example, lack of places).
- 📂 Do not delete folders manually through Explorer if you are not 100% sure of their purpose.
Remember that the cache is not an enemy, but an optimization tool. Problems only arise when this tool goes out of control or files become corrupted. Proper use of the system's built-in functions is always better than radical measures.
Golden rule of optimization: clear the cache only when you see a real lack of space or a specific application is not working correctly, and not according to schedule.
⚠️ Attention: Recovery menu interfaces and item names may differ depending on the smartphone manufacturer and firmware version. Always check the official documentation for your specific model before performing any actions in the engineering menu.
Questions and answers about clearing the cache on Android 9
Will my WhatsApp or Telegram messages be deleted when clearing the cache?
No, clearing the cache does not affect the databases messages, media files or account settings. Your correspondence will remain completely safe. Only temporary files are deleted, such as image thumbnails or downloaded stickers, which are downloaded again if necessary.
Why did the phone start working slower after clearing the cache?
This is normal in the first minutes or hours after the procedure. Applications take time to recreate temporary files and load the necessary resources. Performance will be restored and even improved as soon as the cache is formed correctly.
Is it possible to clear the cache of all applications at once with one button?
In the standard Android 9 settings menu there is no such function for all applications at once, you need to go into each one separately. However, the built-in Files utility or the Recovery menu (for the system cache) allows you to perform a bulk clearing of temporary data.
Does clearing the cache affect saved passwords in the browser?
No, saved passwords and browsing history (unless you choose to delete them separately) remain in place. Clearing the browser cache deletes only downloaded images, scripts and page styles to speed up their reloading.
Do you need to restart your phone after clearing the application cache?
A reboot is not strictly necessary, but is advisable. It helps the system to correctly redistribute resources and terminate background processes associated with deleted files, ensuring more stable operation after cleaning.