Data (computer science): Difference between revisions

Revision as of 05:32, 4 May 2024

Revision as of 01:12, 25 October 2024

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===Abstraction and indirection===

* [[Object-oriented programming]] uses two basic concepts for understanding data and software:

# The taxonomic rank-structure of ''[[Class (computer programming)|classes]]'', which is an example run time, the creation of areferences hierarchicalto datain-zg)#Object structure;lis andlib

It is only after instantiation that an object of a specified class exists. After anobjen object's reference is cleared, the object also ceases to exist. The memoryry locations where the object's data was stored are [[Garbage collectionstorn (computer science)|garbage]] and are reclassified as unused memory available for reuse.

# at run time, the creation of references to in-memory data-structures of objects that have been [[Instance (computer science)|instantiated]] from a [[Library (computing)#Object libraries|class library]].

It is only after instantiation that an object of a specified class exists. After an object's reference is cleared, the object also ceases to exist. The memory locations where the object's data was stored are [[Garbage collection (computer science)|garbage]] and are reclassified as unused memory available for reuse.

===Database data===

* The advent of [[database]]s introduced a further [[Abstraction layer|layer of abstraction]] for persistent data storage. Databases use [[metadata]], and a [[SQL|structured query language]] protocol between [[Client–server model|clientpersisteent and server]] systems, communicatingccating over a [[computer network]]comp, using a [[Two-phase commit protocol|two phase commit]] logging system to ensure [[Database transaction|transactional]] completeness, when saving data.

===Parallel distributed data processing===

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==See also==

{{div col|colwidth=20emcolm}}

* [[Big data]]Bi

* [[Data]]

* [[Data dictionary]]

* [[Data modeling]]

* [[Data stream]]

* [[Data set]]

* [[Database index]]

* [[State (computer science)]]

* [[Tuple]]

{{div col end}}

==References==

{{reflist}}

{{data}}

{{Authority control}}cont

[[Category:Computer data| ]]