128 results about "Virtual database" patented technology

A computer system includes an SSD as swap space for a database management system that comprises a primary database engine and at least one clone database engine. A queued database transaction is sent to the clone database engine for pre-processing while the primary database engine is processing a current database transaction and if data needed to process the queued database transaction is not currently cached in the computer system, the clone database engine fetches the data and caches it into a buffer accessible by the primary database engine. When the primary database engine is ready to process the queued database transaction, it will be able to access the needed data without accessing the SSD, thereby avoiding delays resulting from accessing the SSD.

The invention relates to an access and integration method of an isomerous database for modal multiplexing under the gridding condition. In the method, first, a virtual database for the modal multiplexing is used to describe various database resources and provide an overall uniform view of the isomerous database resource; then, through the resource register way, the resource provider confirms the mapping relation between the database mode of the isomerous database and the database mode of the virtual database, through inquiring about a mapping method, an inquiry request based on the virtual database is converted into an inquiry request based on the real database resource, the service of the virtual database is used to provide a uniform interface for accessing the isomerous database to the resource user; finally, under the gridding condition of including the isomerous database resource, the whole course from the register to the use of the database resource is realized, the integrated course of the isomerous database resource is finished through a gridding application service result, thereby ensuring that the developer of the gridding application service can make use of the service interface of the virtual database to obtain the integrated information from the isomerous database resource. The invention has good practicability, the resource provider can finish most register work automatically only by using a client program; the resource user can obtain the needed isomerous database resource through the uniform interface of the virtual database without needing to concern the geographic distribution, the database mode, the semantic information, etc. of the real database resource.