Research On Frequency Division Multiple Attribute Retrieval Based On Substation Engineering Design

With the improvement of the digital degree in the substation engineering design,engineering design data is also growing gradually.In the mass data storage system,about 70% of the data query operation is implemented through metadata.Metadata is the description of data attribute information or data content and characteristics,effective metadata management is the base of improving the performance of the query and retrieval in engineering storage system.The storage and distribution of metadata through the whole life cycle in engineering design is not reasonable,lacking of regulation mechanism,and the problem of low retrieval efficiency,in order to solve the abovementioned problem,a new frequency division multiple attribute retrieval algorithm based on metadata management is proposed.During the whole life cycle of the substation project,the frequency and time points of the metadata which are accessed dynamic changes,The commonly used metadata management such as subtree partitioning method,hash method and static frequency index algorithm can not effectively solve the problem of the irrational distribution in metadata storage and the low retrieval efficiency.The metadata intelligent frequency division mechanism is designed,and the hierarchical storage management for metadata is implemented,metadata attribute set divide in high access frequency and low access frequency,in order to realize the intelligent migration between different attribute metadata,the intelligent frequency dividing mechanism is established basing on the change of the frequency time point of the metadata;At the same time,after the processing of metadata,construct retrieval algorithm based on characteristic of different layer dimension data attribute set,and a multi attribute search algorithm is constructed for a set of metadata attributes with high access frequency,and construct a consistent hash index algorithm for metadata attribute set with low access frequency,for the purpose of improving the efficiency of the design in the substation design data storage system.Finally,the frequency division multiple attribute search algorithm is adopted and testing its performance in the design of the substation project.Then conduct the comparison and analysis using the subtree partitioning method,hash method and static frequency index method of metadata management algorithm.Experimental results show that the reasonable storage and distribution of metadata information can be realized using frequency division multi attribute retrieval algorithm based on substation engineering design,and it can reduce the needed time for searching,the access speed and performance of engineering design data can be improved effectively.