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- Snapshot_isolation abstract "In databases, and transaction processing (transaction management), snapshot isolation is a guarantee that all reads made in a transaction will see a consistent snapshot of the database (in practice it reads the last committed values that existed at the time it started), and the transaction itself will successfully commit only if no updates it has made conflict with any concurrent updates made since that snapshot.Snapshot isolation has been adopted by several major database management systems, such as SQL Anywhere, InterBase, Firebird, Oracle, PostgreSQL, MongoDB and Microsoft SQL Server (2005 and later). The main reason for its adoption is that it allows better performance than serializability, yet still avoids most of the concurrency anomalies that serializability avoids (but not always all). In practice snapshot isolation is implemented within multiversion concurrency control (MVCC), where generational values of each data item (versions) are maintained: MVCC is a common way to increase concurrency and performance by generating a new version of a database object each time the object is written, and allowing transactions' read operations of several last relevant versions (of each object). Snapshot isolation has also been used to critique the ANSI SQL-92 standard's definition of isolation levels, as it exhibits none of the "anomalies" that the SQL standard prohibited, yet is not serializable (the anomaly-free isolation level defined by ANSI).Snapshot isolation is called "serializable" mode in Oracle and PostgreSQL versions prior to 9.1, which may cause confusion with the "real serializability" mode. There are arguments both for and against this decision; what is clear is that users must be aware of the distinction to avoid possible undesired anomalous behavior in their database system logic.".
- Snapshot_isolation wikiPageID "4615965".
- Snapshot_isolation wikiPageLength "11427".
- Snapshot_isolation wikiPageOutDegree "33".
- Snapshot_isolation wikiPageRevisionID "681328926".
- Snapshot_isolation wikiPageWikiLink ANSI.
- Snapshot_isolation wikiPageWikiLink American_National_Standards_Institute.
- Snapshot_isolation wikiPageWikiLink Borland.
- Snapshot_isolation wikiPageWikiLink Category:Concurrency_control.
- Snapshot_isolation wikiPageWikiLink Category:Databases.
- Snapshot_isolation wikiPageWikiLink Category:Transaction_processing.
- Snapshot_isolation wikiPageWikiLink Database.
- Snapshot_isolation wikiPageWikiLink Database_lock.
- Snapshot_isolation wikiPageWikiLink Database_management_system.
- Snapshot_isolation wikiPageWikiLink Database_normalization.
- Snapshot_isolation wikiPageWikiLink Database_transaction.
- Snapshot_isolation wikiPageWikiLink Firebird_(database_server).
- Snapshot_isolation wikiPageWikiLink InterBase.
- Snapshot_isolation wikiPageWikiLink Isolation_(database_systems).
- Snapshot_isolation wikiPageWikiLink Lock_(database).
- Snapshot_isolation wikiPageWikiLink Microsoft_SQL_Server.
- Snapshot_isolation wikiPageWikiLink MongoDB.
- Snapshot_isolation wikiPageWikiLink Multiversion_concurrency_control.
- Snapshot_isolation wikiPageWikiLink Oracle_Database.
- Snapshot_isolation wikiPageWikiLink Oracle_database.
- Snapshot_isolation wikiPageWikiLink PostgreSQL.
- Snapshot_isolation wikiPageWikiLink SQL.
- Snapshot_isolation wikiPageWikiLink SQL-92.
- Snapshot_isolation wikiPageWikiLink SQL_Anywhere.
- Snapshot_isolation wikiPageWikiLink Serializability.
- Snapshot_isolation wikiPageWikiLink Sql_anywhere.
- Snapshot_isolation wikiPageWikiLink Transaction_processing.
- Snapshot_isolation wikiPageWikiLink Write-write_conflict.
- Snapshot_isolation wikiPageWikiLink Write–write_conflict.
- Snapshot_isolation wikiPageWikiLinkText "Making snapshot isolation serializable".
- Snapshot_isolation wikiPageWikiLinkText "Serializable snapshot isolation".
- Snapshot_isolation wikiPageWikiLinkText "SerializableSI has been analyzed".
- Snapshot_isolation wikiPageWikiLinkText "SerializableSI".
- Snapshot_isolation wikiPageWikiLinkText "Serializable_Snapshot_Isolation".
- Snapshot_isolation wikiPageWikiLinkText "Snapshot isolation".
- Snapshot_isolation wikiPageWikiLinkText "Snapshot isolation#Serializable Snapshot Isolation".
- Snapshot_isolation wikiPageWikiLinkText "snapshot isolation".
- Snapshot_isolation wikiPageWikiLinkText "snapshot".
- Snapshot_isolation hasPhotoCollection Snapshot_isolation.
- Snapshot_isolation wikiPageUsesTemplate Template:Citation_needed.
- Snapshot_isolation subject Category:Concurrency_control.
- Snapshot_isolation subject Category:Databases.
- Snapshot_isolation subject Category:Transaction_processing.
- Snapshot_isolation hypernym Guarantee.
- Snapshot_isolation type Article.
- Snapshot_isolation type Article.
- Snapshot_isolation type Datum.
- Snapshot_isolation comment "In databases, and transaction processing (transaction management), snapshot isolation is a guarantee that all reads made in a transaction will see a consistent snapshot of the database (in practice it reads the last committed values that existed at the time it started), and the transaction itself will successfully commit only if no updates it has made conflict with any concurrent updates made since that snapshot.Snapshot isolation has been adopted by several major database management systems, such as SQL Anywhere, InterBase, Firebird, Oracle, PostgreSQL, MongoDB and Microsoft SQL Server (2005 and later). ".
- Snapshot_isolation label "Snapshot isolation".
- Snapshot_isolation sameAs m.0ccts0.
- Snapshot_isolation sameAs Q7547371.
- Snapshot_isolation sameAs Q7547371.
- Snapshot_isolation wasDerivedFrom Snapshot_isolation?oldid=681328926.
- Snapshot_isolation isPrimaryTopicOf Snapshot_isolation.