Stop bleeding for your iPhone storage. Turn off siri's learning from the app.
by Poster
Jun 2, 2025
37
The iPhone has a personal context log similar to the Mac's "Spotlight Knowledge Events", with the core file knowledgeC.db (and the Biome operation log stream added since iOS 16);
They are located in the system areas/private/var/mobile/Library/CoreDuet/Knowledge/and/private/var/mobile/Library/Biome/,
Ordinary users do not have the right to delete directly, but they can completely disable learning/indexing and clear history through Settings → Siri (or "Apple Intelligence & Siri") → App and other interfaces to slow down the speed of new additions.
In short, in order to promote functions such as Apple intelligence and device-side ai, Apple has made operation records in the system infrastructure in advance.
It is used to provide context for future ai functions, but the ai functions are not available at present, but this log is continuously recorded.
Will waste and consume a lot of iphone space (10 + Gb ~ more)
Can stop "bleeding" without surgery
2.1 Completely prevent iOS from continuing to write to behavior logs
Turn off system-level learning
Path: Settings → Siri (or Apple Intelligence & Siri) → Siri Suggestions
Turn off the three switches: Display in search, Display in lock screen, and Learn from this App.
Apple Support
Reddit
Unindexing App by App
Swipe down on the same page, click on each App, and turn off what appears in Search and Learn from this App.
Turn off the new global "Search" switch (iOS 18 +)
Settings → Spotlight/Siri suggestions can be disabled at once in Search.
Apple Support Community
Disable location-related recommendations (reduce log writes)
Settings → Privacy & Security → Location Services → System Services → Suggestions & Search → Close.
Apple Support
Delete existing Siri & Dictation history (doesn't delete the knowledge database, but clears the cloud copy)
Settings → Apple Intelligence & Siri → Siri History → Delete.
Apple Support
2.2 What effect can this bring?
knowledge-agent and biomeagentd are still running, but log writes have dropped significantly; Community testing shows that newly added files 24 hours after deactivating all recommendations are almost 0 KB.
Spotlight can still search local indexes such as contacts, App names, and more, instead of pushing Siri suggestions or cross-App contexts.
Unfortunately, on ios, the personal operation index file that has been generated cannot be deleted (Apple may have its time-based clearing mechanism)
But it can make the storage space of your iphone more durable. Besides, the domestic ai function is not yet available, so it is really not of great use at present.
Replies
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Anonymous4100 Jun 3, 2025@ Poster @ Anonymous8962 v Friend, hello, does iOS 17.3.1 not have these options above? Why can't I find the cancellation method mentioned in the post when I enter Siri and search in the settings
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Anonymous8962 Jun 3, 2025@ Anonymous4100 This is a separate design for each app, there is no main switch, click in one app by one and you have it
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Anonymous8962 Jun 3, 2025@ Anonymous8449 If you want to check it like this, it's really impossible, so just hand in some time. Anyway, I'll put up a post now as evidence, and there will still be this bug when I check 18.5 in the future. If I'm wrong, you are welcome to reply and hit me in the face later.
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Poster Jun 3, 2025@ Anonymous4101 ios16 +
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Poster Jun 3, 2025@ Anonymous8962 This "siri ai personal context" is really big, and it also depends on the frequency of using Apple's own app. If you use memos and photos as frequently as I do Then it would be huge, huge, There is a way to see how much space the system occupies in the ios, which can be cleared by resetting all configurations. After clearing, you can close and close this learning from the app for comparison.
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Poster Jun 3, 2025@ Anonymous4051 Brother, are you Android?
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Poster Jun 3, 2025@ Anonymous3722 Yes, it cannot be deleted, it can only be cleaned up by clearing all configurations and settings. This occupancy displays the occupancy in the System category
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Poster Jun 3, 2025In the evening, I will add some foreign post urls here. Regarding this space, I will also add a few foreign community posts on the mac side.
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Anonymous1693 Jun 3, 2025I store a lot of things in my mobile phone, resulting in only about 5G capacity left in the system all year round. WeChat often pops up prompts that the capacity is insufficient, and you can't continue to use it without clearing it. For this reason, I frequently delete a lot of episodes that I didn't watch after downloading. The strange thing is that the remaining capacity has changed to less than 5G in less than a day after each deletion. I don't know what is occupying frequently.
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Anonymous2765 Jun 3, 2025Many options I can't really find with 16pro. For example, in the search menu, only the three buttons [Recent Searches], [Show Related Content], and [Help apple Improve Search] are displayed here, but the [Disable Spotlight/Siri Suggestion] described by the original poster is not found.
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Anonymous898 Jun 3, 2025There are too many apps, and I can't close them with one click. It's so tired to click them one by one... https://i.imgur.com/NIvxivj.png
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Poster Jun 3, 2025@ Anonymous8449 https://discussions.apple.com/thread/253811686 What this post mentions is what I am talking about, the data stored by binary biomeagent. This/private/var/mobile/Library/Biome/folder in the post is up to 113GB
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Anonymous8696 Jun 3, 2025@ Anonymous2765 Maybe it's because they're not using a mobile phone from the Bank of China, and my 16pro didn't find those options.
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Poster Jun 3, 2025https://www.msab.com/blog/hidden-gems-in-apple-ios-digital-forensics/ Here is an article explaining these logs, https://news.ycombinator.com/item? id = 42897041 There is also a mention here about the space occupied by this log.
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Poster Jun 3, 2025@ Anonymous8696 Find siri Find siri bottom siri app access
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Anonymous4677 Jun 3, 2025Looked at my Biome catalog under IOS 16.5 trolls, 5.3 GB, so 10 GB + is entirely possible
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Anonymous8962 Jun 4, 2025@ Anonymous1693 Troll or jailbreak arrange it as soon as possible, the capable directory is as follows. v2ex.com/t/1130855