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Realm Files - Flutter SDK

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  • Realm Files
  • Auxiliary Files

A realm is the core data structure used to organize data in Realm. A realm is a collection of the objects that you use in your application, called Realm objects, as well as additional metadata that describe the objects. To learn how to define a Realm object, see Define a Realm Object Schema.

When you open a realm, you can include configuration that specifies additional details about how to configure the realm file. This includes things like:

  • Pass a file path or in-memory identifier to customize how the realm is stored on device

  • Provide a logged-in user and Sync details to use Sync with the realm

  • Specify the realm use only a subset of your app's classes

  • Whether and when to compact a realm to reduce its file size

  • Pass an encryption key to encrypt a realm

  • Provide a schema version or migration block when making schema changes

Realm stores a binary encoded version of every object and type in a realm in a single .realm file. The file is located at a specific path that you can define when you open the realm. You can open, view, and edit the contents of these files with Realm Studio.

Realm creates additional files for each realm:

  • realm files, suffixed with "realm", e.g. default.realm: contain object data.

  • lock files, suffixed with "lock", e.g. default.realm.lock: keep track of which versions of data in a realm are actively in use. This prevents realm from reclaiming storage space that is still used by a client application.

  • note files, suffixed with "note", e.g. default.realm.note: enable inter-thread and inter-process notifications.

  • management files, suffixed with "management", e.g. default.realm.management: internal state management.

Deleting these files has important implications. For more information about deleting .realm or auxiliary files, see: Delete a Realm.

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