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• Multiversion_concurrency_control abstract "Multiversion concurrency control (MCC or MVCC), is a concurrency control method commonly used by database management systems to provide concurrent access to the database and in programming languages to implement transactional memory.If someone is reading from a database at the same time as someone else is writing to it, it is possible that the reader will see a half-written or inconsistent piece of data. There are several ways of solving this problem, known as concurrency control methods. The simplest way is to make all readers wait until the writer is done, which is known as a lock. This can be very slow, so MVCC takes a different approach: each user connected to the database sees a snapshot of the database at a particular instant in time. Any changes made by a writer will not be seen by other users of the database until the changes have been completed (or, in database terms: until the transaction has been committed.)When an MVCC database needs to update an item of data, it will not overwrite the old data with new data, but instead mark the old data as obsolete and add the newer version elsewhere. Thus there are multiple versions stored, but only one is the latest. This allows readers to access the data that was there when they began reading, even if it was modified or deleted part way through by someone else. It also allows the database to avoid the overhead of filling in holes in memory or disk structures but requires (generally) the system to periodically sweep through and delete the old, obsolete data objects. For a document-oriented database it also allows the system to optimize documents by writing entire documents onto contiguous sections of disk—when updated, the entire document can be re-written rather than bits and pieces cut out or maintained in a linked, non-contiguous database structure.MVCC provides point in time consistent views. Read transactions under MVCC typically use a timestamp or transaction ID to determine what state of the DB to read, and read these versions of the data. This avoids managing locks for read transactions because writes can be isolated by virtue of the old versions being maintained, rather than through a process of locks or mutexes. Writes affect a future version but at the transaction ID that the read is working at, everything is guaranteed to be consistent because the writes are occurring at a later transaction ID.".
• Multiversion_concurrency_control wikiPageExternalLink mdb.
• Multiversion_concurrency_control wikiPageExternalLink hawtdb.fusesource.org.
• Multiversion_concurrency_control wikiPageExternalLink hbase.apache.org.
• Multiversion_concurrency_control wikiPageExternalLink index.
• Multiversion_concurrency_control wikiPageExternalLink nuodb.com.
• Multiversion_concurrency_control wikiPageExternalLink 2101.
• Multiversion_concurrency_control wikiPageExternalLink wikiesw.
• Multiversion_concurrency_control wikiPageExternalLink jvstm.
• Multiversion_concurrency_control wikiPageExternalLink sql-cloud-database-editions.
• Multiversion_concurrency_control wikiPageExternalLink about-pbxt.
• Multiversion_concurrency_control wikiPageExternalLink about-xtradb.
• Multiversion_concurrency_control wikiPageID "218423".
• Multiversion_concurrency_control wikiPageRevisionID "606456677".
• Multiversion_concurrency_control hasPhotoCollection Multiversion_concurrency_control.
• Multiversion_concurrency_control subject Category:Concurrency_control.
• Multiversion_concurrency_control subject Category:Concurrency_control_algorithms.
• Multiversion_concurrency_control subject Category:Transaction_processing.
• Multiversion_concurrency_control type Abstraction100002137.
• Multiversion_concurrency_control type Act100030358.
• Multiversion_concurrency_control type Activity100407535.
• Multiversion_concurrency_control type Algorithm105847438.
• Multiversion_concurrency_control type ConcurrencyControlAlgorithms.
• Multiversion_concurrency_control type Event100029378.
• Multiversion_concurrency_control type Procedure101023820.
• Multiversion_concurrency_control type PsychologicalFeature100023100.
• Multiversion_concurrency_control type Rule105846932.
• Multiversion_concurrency_control type YagoPermanentlyLocatedEntity.
• Multiversion_concurrency_control comment "Multiversion concurrency control (MCC or MVCC), is a concurrency control method commonly used by database management systems to provide concurrent access to the database and in programming languages to implement transactional memory.If someone is reading from a database at the same time as someone else is writing to it, it is possible that the reader will see a half-written or inconsistent piece of data. There are several ways of solving this problem, known as concurrency control methods.".
• Multiversion_concurrency_control label "Controle de concorrência multiversão".
• Multiversion_concurrency_control label "Controllo della concorrenza multiversione".
• Multiversion_concurrency_control label "MVCC".
• Multiversion_concurrency_control label "MultiVersion Concurrency Control".
• Multiversion_concurrency_control label "Multiversion Concurrency Control".
• Multiversion_concurrency_control label "Multiversion Concurrency Control".
• Multiversion_concurrency_control label "Multiversion Concurrency Control".
• Multiversion_concurrency_control label "Multiversion concurrency control".
• Multiversion_concurrency_control label "Multiversion concurrency control".
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• Multiversion_concurrency_control sameAs 다중_버전_동시성_제어.
• Multiversion_concurrency_control sameAs Multiversion_Concurrency_Control.
• Multiversion_concurrency_control sameAs Controle_de_concorrência_multiversão.
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• Multiversion_concurrency_control sameAs Multiversion_concurrency_control.
• Multiversion_concurrency_control wasDerivedFrom Multiversion_concurrency_control?oldid=606456677.
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