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What is a memory database? Is sqlite a memory database? On this mode, does it support persistence data to a local file?
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Sqlite Database commonly used to persist the data in most Android applications. Sqlite file is created in your package folder. Sqlite data is persisted after application close and even phone switch off.
SQLite is an offline database that is locally stored in the user's device and we do not have to create any connection to connect to this database.
An SQLite database is limited in size to 281 terabytes (248 bytes, 256 tibibytes). And even if it could handle larger databases, SQLite stores the entire database in a single disk file and many filesystems limit the maximum size of files to something less than this.
To accomplish many of the activities offered by modern mobile phones, such as tracking contacts, events, and tasks, the operating system and applications must be adept at storing and keeping track of large quantities of data.
An in-memory database supports all operations and database access syntax, but doesn't actually persist; it's just data structures in memory. This makes it fast, and great for developer experimentation and (relatively small amounts of) temporary data, but isn't suited to anything where you want the data to persist (it's persisting the data that really costs, yet that's the #1 reason for using a database) or where the overall dataset is larger than you can comfortably fit in your available physical memory.
SQLite databases are created coupled to a particular file, or to the pseudo-file “:memory:” which is used when you're wanting an in-memory database. You can't change the location of a database while it is open, and an in-memory database is disposed when you close its connection; the only way to persist it is to use queries to pull data out of it and write it to somewhere else (e.g., an on-disk database, or some kind of dump file).
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