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- Shadow_paging abstract "In computer science, shadow paging is a technique for providing atomicity and durability (two of the ACID properties) in database systems.A page in this context refers to a unit of physical storage (probably on a hard disk), typically of the order of to bytes.Shadow paging is a copy-on-write technique for avoiding in-place updates of pages. Instead, when a page is to be modified, a shadow page is allocated. Since the shadow page has no references (from other pages on disk), it can be modified liberally, without concern for consistency constraints, etc. When the page is ready to become durable, all pages that referred to the original are updated to refer to the new replacement page instead. Because the page is "activated" only when it is ready, it is atomic.If the referring pages must also be updated via shadow paging, this procedure may recurse many times, becoming quite costly. One solution, employed by the WAFL file system (Write Anywhere File Layout) is to be lazy about making pages durable (i.e. write-behind caching). This increases performance significantly by avoiding many writes on hotspots high up in the referential hierarchy (e.g.: a file system superblock) at the cost of high commit latency.Write ahead logging is a more popular solution that uses in-place updates.[citation needed]Shadow paging is similar to the old master-new master batch processing technique used in mainframe database systems. In these systems, the output of each batch run (possibly a day's work) was written to two separate disks or other form of storage medium. One was kept for backup, and the other was used as the starting point for the next day's work.Shadow paging is also similar to purely functional data structures, in that in-place updates are avoided.".
- Shadow_paging wikiPageExternalLink wp_3002.pdf.
- Shadow_paging wikiPageID "245930".
- Shadow_paging wikiPageRevisionID "591929196".
- Shadow_paging hasPhotoCollection Shadow_paging.
- Shadow_paging subject Category:Computer_file_systems.
- Shadow_paging subject Category:Database_algorithms.
- Shadow_paging type Abstraction100002137.
- Shadow_paging type Act100030358.
- Shadow_paging type Activity100407535.
- Shadow_paging type Algorithm105847438.
- Shadow_paging type Arrangement105726596.
- Shadow_paging type ClassificationSystem105727220.
- Shadow_paging type Cognition100023271.
- Shadow_paging type ComputerFileSystems.
- Shadow_paging type DatabaseAlgorithms.
- Shadow_paging type Event100029378.
- Shadow_paging type FileSystem105732614.
- Shadow_paging type Procedure101023820.
- Shadow_paging type PsychologicalFeature100023100.
- Shadow_paging type Rule105846932.
- Shadow_paging type Structure105726345.
- Shadow_paging type YagoPermanentlyLocatedEntity.
- Shadow_paging comment "In computer science, shadow paging is a technique for providing atomicity and durability (two of the ACID properties) in database systems.A page in this context refers to a unit of physical storage (probably on a hard disk), typically of the order of to bytes.Shadow paging is a copy-on-write technique for avoiding in-place updates of pages. Instead, when a page is to be modified, a shadow page is allocated.".
- Shadow_paging label "Shadow Paging".
- Shadow_paging label "Shadow paging".
- Shadow_paging label "Механизм теневых страниц".
- Shadow_paging label "シャドウページング".
- Shadow_paging sameAs Shadow_Paging.
- Shadow_paging sameAs シャドウページング.
- Shadow_paging sameAs m.01kl9m.
- Shadow_paging sameAs Q1132990.
- Shadow_paging sameAs Q1132990.
- Shadow_paging sameAs Shadow_paging.
- Shadow_paging wasDerivedFrom Shadow_paging?oldid=591929196.
- Shadow_paging isPrimaryTopicOf Shadow_paging.