how much data can I really store with Application.Storage ?

Former Member over 4 years ago

I'm using Application.Storage to store battery data, device is an Instinct 2

I've started with really long names for the keys and now playing around with optimizing it, but I'm confused about how much data I really can store. The docs says its 128KB

Every data point is a float number and if I make the keys also just a number I can store 1366 key-value pairs when running the unit tests, before I ran into Exception: Toybox.Application.Storage.setValue() storage limit exceeded

that are 5464Bytes of real data (every float 32bit) and the same amount of "data" in the keys.

How are the 128KB calculated?

0 waterkip over 4 years ago

values can be 32KB: https://developer.garmin.com/connect-iq/api-docs/Toybox/Application/Storage.html#setValue-instance_function

Values can also be of type Array or Dictionary containing the above listed types, excluding BitmapResource and AnimationResource. There is a limit on the size of the Object Store that can vary between devices. If you reach this limit, the value will not be saved and an exception will be thrown. Also, values are limited to 32 KB in size.

0 jim_m_58 over 4 years ago

One other thing is Application.Storage can be slow as it hits the filesystem each time you do a getValue().

So if you try to read a number of keys at startup, you'll see a noticeable delay on real devices.