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  2. Schema migration - Wikipedia

    en.wikipedia.org/wiki/Schema_migration

    Execute a backfill in the database: for all data that was written in the old format, move it over to the new format. Deploy an application change once more that stops reading the old data. Remove the old format data from the schema.

  3. Realm (database) - Wikipedia

    en.wikipedia.org/wiki/Realm_(database)

    Realm is an open source object database management system, initially for mobile operating systems (Android/iOS) [1] but also available for platforms such as Xamarin, [2] React Native, [3] and others, [4] [5] including desktop applications (Windows [6]).

  4. Data migration - Wikipedia

    en.wikipedia.org/wiki/Data_migration

    Migration, which focuses on the digital object itself, is the act of transferring, or rewriting data from an out-of-date medium to a current medium and has for many years been considered the only viable approach to long-term preservation of digital objects. [10] Reproducing brittle newspapers onto microfilm is an example of such migration.

  5. SQL - Wikipedia

    en.wikipedia.org/wiki/SQL

    SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...

  6. Cosmos DB - Wikipedia

    en.wikipedia.org/wiki/Cosmos_DB

    The SQL API lets clients create, update and delete containers and items. Items can be queried with a read-only, JSON-friendly SQL dialect. [8] As Cosmos DB embeds a JavaScript engine, the SQL API also enables: Stored procedures. Functions that bundle an arbitrarily complex set of operations and logic into an ACID-compliant transaction. They are ...

  7. MongoDB - Wikipedia

    en.wikipedia.org/wiki/MongoDB

    MongoDB can be used as a file system, called GridFS, with load-balancing and data-replication features over multiple machines for storing files. This function, called a grid file system, [36] is included with MongoDB drivers. MongoDB exposes functions for file manipulation and content to developers.

  8. Comparison of relational database management systems - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_relational...

    Note (6): Can be implemented using Function-based Indexes in Oracle 8i and higher, but the function needs to be used in the sql for the index to be used. Note (7): A PostgreSQL functional index can be used to reverse the order of a field.

  9. SPARQL - Wikipedia

    en.wikipedia.org/wiki/SPARQL

    SPARQL (pronounced "sparkle", a recursive acronym [2] for SPARQL Protocol and RDF Query Language) is an RDF query language—that is, a semantic query language for databases—able to retrieve and manipulate data stored in Resource Description Framework (RDF) format.