Tsinghua University

The Chinese University of Hong Kong

Yeh-Ching Chung

Rui Guo Zhang

Wenguang Chen

Yongwei Wu

Yuan Yu

Lidong Zhang

A terminal, a storage medium, and a database synchronization method thereof are disclosed. The database synchronization method includes reading data from a first database and capturing a dynamic data log in the first database; joining data to a waiting queue read from the first database; determining a dislocation category of the data in the waiting queue, and rearranging the dislocation data in the waiting queue into a first category according to the dynamic data log; and synchronizing the rearranged data to a second database. According to the database synchronization method provided by the present invention caches the data read from the first database to the waiting queue, and dislocation data in the waiting queue is rearranged and then synchronized to the second database, so that a problem of poor data identity after database synchronization is avoided.

Terminal, storage medium, and database synchronization method thereof

Provided are a hybrid distributed file system architecture structure, an applied file storage processing method, a dynamic migration method, and application thereof. The file storage processing method comprises: acquiring storage attributes of a file to be stored, wherein the storage attributes at least include a size of the file; determining, according to a pre-configured storage rule and the attributes of the file to be stored, in which distributed file system the file to be stored is stored; and storing the file to be stored in the determined distributed file system. The method further comprises migrating, according to a predetermined policy, a file that has been stored in a predetermined storage location. The device intelligently selects a file underlying storage policy according to file feature attributes to decide whether to migrate the file and to which file system the file is migrated so as to satisfy usage equalization of different file systems and also minimize performance degradation. By means of experimental comparison, it is concluded that the present disclosure can greatly improve comprehensive file performances such as I/O performance and the usage equalization of the file system.

Hybrid file system architecture, file storage, dynamic migration, and application thereof

The present disclosure provides a method for computing a support of an itemset candidate based on graph structure data, a method for determining a frequent itemset using the same, and a method for determining a frequent itemset based on a prefix tree. The method for computing a support of an itemset candidate based on graph structure data comprises: converting data in a database to graph structure data (S); obtaining an itemset candidate from the database (S); obtaining a connected component corresponding to the itemset candidate in the graph structure data (S); determining the number of vertices included in the connected component (S); and determining the number of vertices as the support of the itemset candidate (S). The method for computing the support of the itemset candidate based on the graph structure data and the method for determining the frequent itemset using the same provided by the embodiments of the present disclosure may avoid spending too much time in obtaining the support of the itemset candidate by scanning the database, which improves efficiency of the algorithm while ensuring effectiveness of the algorithm.

Growing community of inventors

Shenzhen, China

Yeh-Ching Chung