A database management system with efficient version control

G - Physics – 06 – F

Patent

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G06F 9/46 (2006.01) G06F 17/30 (2006.01)

Patent

CA 2537411

A two copy versioning scheme is proposed. The scheme provides efficient implementation for a high read load database and eliminates read dependencies. The versioning scheme provides efficient implementation for transactions executing under ANSI READ COMMITTED isolation, and is extensible to serializable isolation. The two-copy versioning scheme is garbage free meaning that all versions of data records are used during execution and is adapted to index scanning operations. A "deferred delete" scheme allows read transactions to complete data deallocation operations. Statements that require "snapshots" are efficiently supported.

L'invention concerne un schéma de versionnage à deux copies. Ledit schéma permet une implémentation efficace d'une base de données à grande charge de lecture et l'élimination de dépendances de lecture. Ledit schéma permet par ailleurs une implémentation efficace de transactions fonctionnant sous isolement <= ANSI READ COMMITTED >= et peut être étendu à un isolement pouvant être mis en série. Ledit schéma de versionnage à deux copies est exempt de déchets, c.-à-d. que toutes les versions d'enregistrements de données sont employées lors de l'exécution, et est adapté à des opérations de balayage d'indices. Un schéma d'effacement différé permet à des transactions de lecture d'achever des opérations de désaffectation de données. Des instructions nécessitant des clichés sont supportées efficacement.

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