Data access method and device

The invention discloses a data access method and device, and the method comprises the steps: determining an ith starting time period of an application program when a request end starts the application program for the ith time; when the request end determines that the ith starting time period is smaller than the nth viscous period time threshold value, an access request is generated according to the identifier of the nth to-be-accessed data center, and the access request is sent to the service end; the identifier of the nth to-be-accessed data center and the nth viscous period time threshold value are determined and sent to the request end by the service end when the application program is started for the jth time; the identifier of the nth to-be-accessed data center is used for indicating the service end to distribute the access request to the nth to-be-accessed data center; the nth viscous period time threshold value is determined by the service end according to the synchronous data loss rate of the nth to-b