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  2. NoSQL - Wikipedia

    en.wikipedia.org/wiki/NoSQL

    [6] [7] NoSQL databases are increasingly used in big data and real-time web applications. [8] Motivations for this approach include simplicity of design, simpler "horizontal" scaling to clusters of machines (which is a problem for relational databases), [5] finer control over availability, and limiting the object-relational impedance mismatch. [9]

  3. Object–relational impedance mismatch - Wikipedia

    en.wikipedia.org/wiki/Object–relational...

    Object–relational impedance mismatch is a set of difficulties going between data in relational data stores and data in domain-driven object models. Relational Database Management Systems (RDBMS) is the standard method for storing data in a dedicated database, while object-oriented (OO) programming is the default method for business-centric design in programming languages.

  4. Unnormalized form - Wikipedia

    en.wikipedia.org/wiki/Unnormalized_form

    In database normalization, unnormalized form (UNF or 0NF), also known as an unnormalized relation or non-first normal form (N1NF or NF 2), [1] is a database data model (organization of data in a database) which does not meet any of the conditions of database normalization defined by the relational model.

  5. Database normalization - Wikipedia

    en.wikipedia.org/wiki/Database_normalization

    Database normalization is the process of structuring a relational database accordance with a series of so-called normal forms in order to reduce data redundancy and improve data integrity.

  6. CAP theorem - Wikipedia

    en.wikipedia.org/wiki/CAP_theorem

    proceed with the operation and thus provide availability but risk inconsistency. Note this doesn't necessarily mean that system is highly available to its users. [5] CAP theorem Euler diagram. Thus, if there is a network partition, one has to choose between consistency or availability.

  7. First normal form - Wikipedia

    en.wikipedia.org/wiki/First_normal_form

    First normal form (1NF) is a property of a relation in a relational database.A relation is in first normal form if and only if no attribute domain has relations as elements. [1]

  8. Document-oriented database - Wikipedia

    en.wikipedia.org/wiki/Document-oriented_database

    This leads to problems when trying to translate programming objects to and from their associated database rows, a problem known as object-relational impedance mismatch. [4] Document stores more closely, or in some cases directly, map programming objects into the store. These are often marketed using the term NoSQL.

  9. Query optimization - Wikipedia

    en.wikipedia.org/wiki/Query_optimization

    Query optimization is a feature of many relational database management systems and other databases such as NoSQL and graph databases.The query optimizer attempts to determine the most efficient way to execute a given query by considering the possible query plans.