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- Write-ahead_logging abstract "In computer science, write-ahead logging (WAL) is a family of techniques for providing atomicity and durability (two of the ACID properties) in database systems.In a system using WAL, all modifications are written to a log before they are applied. Usually both redo and undo information is stored in the log. The purpose of this can be illustrated by an example. Imagine a program that is in the middle of performing some operation when the machine it is running on loses power. Upon restart, that program might well need to know whether the operation it was performing succeeded, half-succeeded, or failed. If a write-ahead log were used, the program could check this log and compare what it was supposed to be doing when it unexpectedly lost power to what was actually done. On the basis of this comparison, the program could decide to undo what it had started, complete what it had started, or keep things as they are.WAL allows updates of a database to be done in-place. Another way to implement atomic updates is with shadow paging, which is not in-place. The main advantage of doing updates in-place is that it reduces the need to modify indexes and block lists.ARIES is a popular algorithm in the WAL family.File systems typically use a variant of WAL for at least file system metadata called journaling.The PostgreSQL database system also uses WAL to provide point-in-time recovery and database replication features.SQLite database also uses WAL.MongoDB uses write-ahead logging to provide consistency and crash safety.Apache HBase uses WAL in order to provide recovery after disaster.".
- Write-ahead_logging wikiPageExternalLink wal.html.
- Write-ahead_logging wikiPageID "244953".
- Write-ahead_logging wikiPageRevisionID "600055644".
- Write-ahead_logging hasPhotoCollection Write-ahead_logging.
- Write-ahead_logging subject Category:Database_algorithms.
- Write-ahead_logging type Abstraction100002137.
- Write-ahead_logging type Act100030358.
- Write-ahead_logging type Activity100407535.
- Write-ahead_logging type Algorithm105847438.
- Write-ahead_logging type DatabaseAlgorithms.
- Write-ahead_logging type Event100029378.
- Write-ahead_logging type Procedure101023820.
- Write-ahead_logging type PsychologicalFeature100023100.
- Write-ahead_logging type Rule105846932.
- Write-ahead_logging type YagoPermanentlyLocatedEntity.
- Write-ahead_logging comment "In computer science, write-ahead logging (WAL) is a family of techniques for providing atomicity and durability (two of the ACID properties) in database systems.In a system using WAL, all modifications are written to a log before they are applied. Usually both redo and undo information is stored in the log. The purpose of this can be illustrated by an example. Imagine a program that is in the middle of performing some operation when the machine it is running on loses power.".
- Write-ahead_logging label "WAL-Prinzip".
- Write-ahead_logging label "Write-ahead logging".
- Write-ahead_logging label "ログ先行書き込み".
- Write-ahead_logging label "预写式日志".
- Write-ahead_logging sameAs WAL-Prinzip.
- Write-ahead_logging sameAs ログ先行書き込み.
- Write-ahead_logging sameAs 로그_선행_기입.
- Write-ahead_logging sameAs m.01kg_v.
- Write-ahead_logging sameAs Q627688.
- Write-ahead_logging sameAs Q627688.
- Write-ahead_logging sameAs Write-ahead_logging.
- Write-ahead_logging wasDerivedFrom Write-ahead_logging?oldid=600055644.
- Write-ahead_logging isPrimaryTopicOf Write-ahead_logging.