So, we all know how to flash a ROM and the various steps you should do to ensure a clean install.
Dalvik, cache, data, and system should be wiped. Minus factory reset (which does data and system) for updated builds of a ROM.
My question, which was prompted by installing Google Now, is what do each of these things actually do? It would be useful for example to know if I should clean the Dalvik cache when trying to install a less buggy version of the app, but as I have no idea what Dalvik is I have no way of knowing.
Would any knowledgeable person like to quickly break down what clearing the cache, data, system and Dalvik do?
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yes whenever you install a new ROM its better to have a good clean up before doing so...
factory rest will format or wipe cache and data...dalvik is inside cache so no need to do it again..the same for battery stats...format system is clearly just wiping system partition clean
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Hi people, just a quicky! If you update NSCollab 1.0.38 to 1.0.39, do you have to delete data & dalvik cache (factory restore!) like it's a new installation, or can you just do a delete dalvik cache? Only I did the delete dalvik cache ONLY method for the update & had no problems, but I'm now presuming that if you don't do the full wipe, then really in essence you're effectively not really fully updating the whole system as you would be if wiping it first (through ClockworkMod Recovery,(RomManager!)!?
TIA!
There is no need to fully wipe when doing that minor upgrade to 1.0.39. I think you only need to fully wipe when changing ROMs. You probably do not even have to wipe Dalvik cache but since it only takes a few minutes to reload it, I would do it anyway.
Data wipe is completely overkill, however.
Apolyxon said:
There is no need to fully wipe when doing that minor upgrade to 1.0.39. I think you only need to fully wipe when changing ROMs. You probably do not even have to wipe Dalvik cache but since it only takes a few minutes to reload it, I would do it anyway.
Data wipe is completely overkill, however.
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Thanks Apolyxon for your quick reply! I had thaught as much, as I knew wiping data also would effectively commit a factory restore & I would lose all my apps, settings etc! Just wanted to be sure!
Hi all,
I have a quick question. What do all the wipes in ClockWorkMod actually wipe?Specifically, what do the following actually wipe?
- wipe data/factory reset?
- wipe cache partition?
- wipe Dalvik Cache?
I did do a search, and have installed many roms, and although I follow all the instructions, I have never known what these actually do.
Wipe data means your ROM setting and date and time such things will be deleted
Wipe cache means wiping the cache of user and system apps.for every application it allocate some space for cache that well be removed
Wipe dalvic cache is wiping compilation cache.in Android having a dalvic compiler.
Hope you get it...this is what i know about this
Xperian8~ click thanks if it helps...
Wiping data means deleting all the apps unrelated to system application, and in addition, it also deletes most the saved data for all applications (from /data/data) folder.
Wiping cache means deleting all those files left by installation process or any other temporary mean. In general it is safe to do so without getting anything reset.
Wiping dalvik cache (/data/dalvik-cache) means deleting all the cached files generated by compiler. In general it is safe to do so without getting anything reset. This is also epic useful when you face force close error. It may have something to do with the dalvik cache.
Is wipe data and factory reset the same?
I see a lot of roms say wipe cache, wipe data, and wipe dalvik cache. In TWRP on my Note 2, I see wipe cache and dalvik cache but not data. Is wiping data the same as factory reset? If not should I just ignore "wipe data"?
....to wipe unneeded files in the dalvik cache, and so they will add up over time and take a lot of space and make the phone slower? Therefore it is a MUST to root one's phone?
Is that a correct assumption?
Thanks!
Try it. Use any file manager, go to /cache/dalvik-cache, and delete something, or everything.
The reason why it is called a cache is to speed up the phone.
It won't take up memory because of the way the phones storage is partitioned.
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MarlonKaye said:
....to wipe unneeded files in the dalvik cache, and so they will add up over time and take a lot of space and make the phone slower? Therefore it is a MUST to root one's phone?
Is that a correct assumption?
Thanks!
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For formating caches you could use file manager but it also need root permission...
And until you flash other custom rom you need not to wipe cache...
Apps cache is being created for the first time you boot your phone for better application launch...
So if you got a serious problem of force crash on stock rom, please do full reset...
Rom: CodeBox 1.4.0 Unofficial
Kernel: Horsepower 3.1 by fuss
If you like my post please hit thanks button...
You can use Factory Reset from Settings menu.
guys...
Guys, please read the original post.
Anyway, I tried unrooting my phone and deleting contents of dalvik cache. As expected, this is what happened:
1. Using ES File Explorer, WAS NOT ABLE to access the /data/dalvik-cache folder. It showed "Empty folder" or something like that.
2. Using Root Explorer, message that read "You're phone doesn't seem to be rooted, etc. etc. " (cannot access folder also)
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So here's my new set of questions:
1. Does factory reset erase dalvik-cache? (I would assume so)
2. If phone is unrooted, dalvik cache contents cannot be accessed or deleted (as I have proven). Does that mean they will add up over time (unless you factory reset the phone??) and cause problems like making the phone slower?
Hope that's clear.
Thanks!!!
What phone are you using? If for samsung, you can still wipe that in stock recovery even if you are unrooted...
Dalvik cache is in your /data partition, so yeah, it will be erased if you factory reset...your phone should manage dalvik by itself, it should not build up (except if you mess with it), so don't worry...
Ryuinferno, hello. I'm using Samsung Galaxy Ace. So how do I wipe the dalvik cache in stock recovery of unrooted phone? Are you referring to factory reset / data wipe? I know that already. I know that already. If you're referring to something else, please let me know.
Are you sure android phones manage the dalvik cache by themselves? Because sometimes when I uninstall an app, a related file would still be left in dalvik. I would then manually delete it or delete it using Titanium Backup. Also, why does Titanium Backup have an option to "Clean up the Dalvik cache..." if the phone manages it by itself?
Thanks!!!
Ryuinferno said:
What phone are you using? If for samsung, you can still wipe that in stock recovery even if you are unrooted...
Dalvik cache is in your /data partition, so yeah, it will be erased if you factory reset...your phone should manage dalvik by itself, it should not build up (except if you mess with it), so don't worry...
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Even wiping dalvik cache will cause apps to misbehave in you don't factory reset ...
If you are rooted , it will also have same effect ...
So do factory reset if you are in stock ROM and full wipe if you are on custom ROM ...
ROM : CodeBox Unofficial 1.4.0
Kernel : Horsepower 3.1.0-Fuss
If you like my post please hit like button...
Hmm...I can't remember too well as I left stock recovery too long...never left my phone unrooted......I think there is a wipe cache option in stock recovery but I am not sure whether will it wipe dalvik or not...
Titanium backup has an option to wipe dalvik because when changing ROMs/restoring apps, the current dalvik may be conflicting with the newly restored app...that is why you need to rebuild them...usually the old unused dalvik should be cleared upon a reboot...
"Hmm...I can't remember too well as I left stock recovery too long...never left my phone unrooted......I think there is a wipe cache option in stock recovery but I am not sure whether will it wipe dalvik or not..."
Maybe not? Because wipe cache and wipe dalvik cache are two separate options in ClockworkMOD Recovery, is it not? Or maybe in stock recovery, it DOES wipe dalvik as well....
Usually when installing roms, in the instructions you're told to wipe data, and then dalvik cache.
As far as I'm aware, since dalvik cache is IN /data it's wiped when data is wiped. So why is it a separate instruction?
rymate1234 said:
Usually when installing roms, in the instructions you're told to wipe data, and then dalvik cache.
As far as I'm aware, since dalvik cache is IN /data it's wiped when data is wiped. So why is it a separate instruction?
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I am too having the same question!!
All stock roms and some custom roms (depends on developers) have .odex files in for all app and framework files(inside system) these are files which contains some information about those apks and jar files and these odex files are written in dalvik partition and run at the boot and make boot faster. When you install a new rom these must be wiped since it is a part of the old rom
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Is it safe to clear the dalvik cache, & what exactly is cleared when I clear it? I know it can be cleared with the stock recovery, because I just helped a friend factory reset their phone who has the same phone as me (both unrooted Galaxy On5 with stock ROM) & I saw an option in the list in recovery.
tsaxda said:
Is it safe to clear the dalvik cache, & what exactly is cleared when I clear it? I know it can be cleared with the stock recovery, because I just helped a friend factory reset their phone who has the same phone as me (both unrooted Galaxy On5 with stock ROM) & I saw an option in the list in recovery.
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Only cached data gets cleared, more specifically, cached data used by your system apps and services. This cached data will automatically be rebuilt when you reboot the device, you may or may not see a message saying "optimizing apps" while the device is rebuilding dalvik/ART cache during the boot process.
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What I mean is do I lose anything important like settings/data within apps etc;. & is there any risk of my phone not booting properly? I have backed up what data I could. I've seen posts on quora, asking about different problems they had after clearing dalvik, including one who seemed to think their phone had died, but they all seem to involve rooted phones, because the solution given is always to flash another ROM/reboot to TWRP recovery. I was tempted to do it because I'm running out of space, & somebody online said there dalvik folder was 300MB.
tsaxda said:
What I mean is do I lose anything important like settings/data within apps etc;. & is there any risk of my phone not booting properly? I have backed up what data I could. I've seen posts on quora, asking about different problems they had after clearing dalvik, including one who seemed to think their phone had died, but they all seem to involve rooted phones, because the solution given is always to flash another ROM/reboot to TWRP recovery. I was tempted to do it because I'm running out of space, & somebody online said there dalvik folder was 300MB.
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No, you won't lose anything, as I said, it is only a type of temporary data, data that is used in the background while the device is running, temporary in a similar kind of way as RAM data with the exception that RAM data doesn't necessarily persist from one reboot to the other whereas cached data does persist after reboot, unless wiped, in which case, that cached data will automatically be rebuilt exactly as it Is needed when each app loads at startup on the next reboot after the wipe.
As long as you aren't wiping the system partition or the data partition, you won't lose anything. Wiping cache is nothing to sweat over, it is a very common and necessary process when making changes to your device.
Failing to wipe when making changes to the system are what causes problems, wiping is necessary to avoid having bugs and issues caused by cached data from before the changes conflicting with the changes that you made. Wiping cache then rebooting allows the device to build the cached data the way it needs to incorporate the new changes that you made.
I called samsung to ask whether they recommended clearing it & she very sternly said "we are not clearing dalvik". It made me wonder whether she simply didn't know what dalvik is, because she asked how to spell it as though she was looking it up, or if there was some other reason.
tsaxda said:
I called samsung to ask whether they recommended clearing it & she very sternly said "we are not clearing dalvik". It made me wonder whether she simply didn't know what dalvik is, because she asked how to spell it as though she was looking it up, or if there was some other reason.
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The option to wipe dalvik cache is not an option in stock recovery or any other stock or non-root, non-custom option. It is typically only an option if you have a custom recovery such as TWRP.
Only a developer or someone that is familiar with root and custom android software would be familiar with wiping dalvik cache. A standard employee of a manufacturer or customer support agent would not be familiar with wiping dalvik cache.
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i flashed twrp and majisk yesterday but my apps was playing up so i did a delvick cache wipe and now my phone is no longer rooted and no longer has majisk do i need to install twrp and majisk again or just flash majisk again
When you reboot, bóth the Dalvik ( correct: ART ) cache and the System Cache are re-created. So no benefits at all.