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Codd, departed from this tradition by insisting that applications should search for data by content, rather than by following links.The relational model employs sets of ledger-style tables, each used for a different type of entity.Interest in a standard began to grow, and Charles Bachman, author of one such product, the Integrated Data Store (IDS), founded the "Database Task Group" within CODASYL, the group responsible for the creation and standardization of COBOL.In 1971, the Database Task Group delivered their standard, which generally became known as the "CODASYL approach", and soon a number of commercial products based on this approach entered the market.Since DBMSs comprise a significant market, computer and storage vendors often take into account DBMS requirements in their own development plans.Databases and DBMSs can be categorized according to the database model(s) that they support (such as relational or XML), the type(s) of computer they run on (from a server cluster to a mobile phone), the query language(s) used to access the database (such as SQL or XQuery), and their internal engineering, which affects performance, scalability, resilience, and security.The next generation of post-relational databases in the late 2000s became known as No SQL databases, introducing fast key-value stores and document-oriented databases.
As computers grew in speed and capability, a number of general-purpose database systems emerged; by the mid-1960s a number of such systems had come into commercial use.
The DBMS software additionally encompasses the core facilities provided to administer the database.
The sum total of the database, the DBMS and the associated applications can be referred to as a "database system".
Only in the mid-1980s did computing hardware become powerful enough to allow the wide deployment of relational systems (DBMSs plus applications).
By the early 1990s, however, relational systems dominated in all large-scale data processing applications, and as of 2018 Object databases were developed in the 1980s to overcome the inconvenience of object-relational impedance mismatch, which led to the coining of the term "post-relational" and also the development of hybrid object-relational databases.RAID is used for recovery of data if any of the disks fail.