| 摘要 |
A method for determining access to a data table store includes determining static properties of data sources during query design, loading the static properties into an unavailability table, at query execution evaluating dynamic properties of the data sources and updating the unavailability table, evaluating a preference expression by a table dispatcher component using session context information from the availability table, determining if a preferred table is available at query execution, and if available indicating to access the preferred table, else applying unavailability rules to obtain repair actions. The preference expression including a user-defined preference between an original table and its replica and user-defined repair actions, where a selection is made at query execution between an original data table and a replicated data table based on the unavailability rules. A non-transitory computer readable medium and a system for implementing the method are also disclosed. |
