APPARATUS AND METHOD FOR EXPANDING A SHARED-NOTHING SYSTEM

The invention relates to a system and a method. The method comprises a device used for forming a data redistribution schedule in response to deletion of a second node added to data storage including a first node. The data redistribution schedule stores a plurality of parameters used for redistributing a group of data stored in a source list to a target list, wherein the source list is associated with the first node and the target list is associated with the second node. The parameters include a first parameter for indicating the priority for redistribution of the group of data in the source list in the target list and a parallelism parameter indicating the quantity of source lists redistributed at the same time. The device redistributes a group of data in one source list to a target list according to parameters stored in the data redistribution schedule based on the priority and the parallelism in response to the deletion of the second node added to the data storage. Each of the first node and the second node