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Editorial Team
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Asked: 2026-06-01T02:00:15+00:00

I have managed objects that have image properties. Since storing large blobs in CoreData

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I have managed objects that have image properties. Since storing large blobs in CoreData is a bad idea, I’m trying to use the built-in CoreData option “Store in External Record File” which you can see in the Data Model Inspector.

Despite enabling this option, I do not see any image data being stored externally. Judging by the size, it seems like they are still being saved in the sqlite file. What is the issue?

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1 Answer

  1. Editorial Team

    If your store type is NSSQLiteStoreType, your attribute is NSBinaryDataAttributeType. You have enabled setAllowsExternalBinaryDataStorage and your object data size is larger then approximately 1MB.

    • Objects that are smaller than 1MB are stored in the sqlite database.
    • Objects that are larger are just a reference to a external file.

    You’ll find the (external) files in a hidden sub-directory at the same location as the persistent store.

    <path>/<database>.sqlite
<path>/<your_database>_SUPPORT/_EXTERNAL_DATA/
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