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In order to avoid making expensive system calls, Realm files are rarely shrunk at runtime.Instead, they grow by specific size increments, with new data being written within unused space tracked inside the file.You can do this by setting the Realm works in such a way that the size of a Realm file is always larger than the total size of the objects stored within it.See our documentation on threading for some of the reasons why this architecture enables some of Realm’s great performance, concurrency and safety advantages.You could give each account its own Realm file that will be used as the default Realm by doing the following: The most common location to store writable Realm files is the “Documents” directory on i OS and the “Application Support” directory on mac OS.Please respect Apple’s i OS Data Storage Guidelines, which recommend that if documents that can be regenerated by the app should be stored in the property (and vice-versa).For a detailed discussion about Realms, please read .For example, suppose you have an application where users have to log in to your web backend, and you want to support quickly switching between accounts.

Subsequent accesses to a Realm from the same thread will reuse a cached instance and will always succeed.

In order to handle this, it is necessary to ensure that the file protection attributes applied to both the Realm file itself and its auxiliary files is downgraded to a less strict one that allows file access even when the device is locked, such as .

If you choose to opt out of complete i OS file encryption in this way, we encourage you to use Realm’s own built-in encryption to ensure your data is still properly secured.

For example, if you want to show the users a list of all available ZIP codes.

This is another use case for the In-memory Realms do not save data across app launches, but all other features of Realm will work as expected, including querying, relationships and thread-safety.

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