Consistent read in a distributed database environment

Details Consistent read in a distributed database environment Consistent read in a distributed database environment

G - Physics

06

F

G06F 17/30 (2006.01)

Patent

CA 2447692

Techniques are provided for determining which data item version to supply to a query. According to the techniques, the determination is made by associating a new field, which indicates the time a data item version was current, with each data item version; associating a new field with each query, which indicates the last change that the query must see made by the transaction to which the query belongs; and determining which data item version to use to answer the query based, in part, on a comparison between the values of the two new fields.

L'invention concerne des techniques permettant de déterminer la version d'article de données à fournir à une demande. En fonction de ces techniques, cette détermination s'effectue par association d'un nouveau champ, indiquant le moment où une version d'article de données a été courante, à chaque version d'article de données; par association d'un nouveau champ à une demande indiquant la dernière modification visible par la demande effectuée par la transaction à laquelle ladite demande appartient; et par détermination de la version d'article de données à utiliser pour répondre partiellement à cette demande en fonction d'une comparaison entre les valeurs des deux nouveaux champs.

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