Research And Implementation Of CD-ROM Storage System Based On Blu-ray Storage

The widespread use of various Internet applications has led to a rapid increase in the amount of data in an exponential form.According to the forecast,by 2020,the total amount of data in the world will be 45 times as much as the current amount of data.The data that is often accessed is only 20%,but the cold data that is rarely used accounts for about 80%.The Blu-ray disc is used to store cold data that is not frequently modified.Due to the large storage,the cold data is likely to be accessed.Blu-ray disc query is very slow,how to improve the query speed will be the focus of thesis.This thesis will improve the query speed from two aspects,one is at the database level,researchers can optimize the database to improve query speed.The other is from the cache level,researchers can improve the cache replacement algorithm to implement query speed.The main contents of this thesis are as follows:Firstly,this thesis studies the model of the cache replacement algorithm and analyzes the effect of the VDL cache model on the overall system performance and several important factors in the cache model.through the study on the effect of traditional cache replacement algorithm and performance parameters,and in consideration of characteristics of the Blu-ray disc and the disk array,the thesis proposes a new algorithm based on the classifications of documents and the most recently unused algorithm for Blu-ray disc(TypeAndDisk-LRU).LRU has the characteristics of easy implementation and low cost,but it may cause cache pollution.This algorithm has improved the traditional algorithm,which not only has the advantages of fast speed and high efficiency,but also has the advantages of the disk array and the Blu-ray disc.It also alleviates the problem of cache pollution.Compared with the traditional algorithm,the improved algorithm is more efficient.Next,this thesis studies the three main factors that affect the efficiency of database query and designs the technical scheme to solve these problems including optimize the database connection pool,optimize the index and optimize the SQL statement for the factors that affect the query efficiency.The three optimization schemes are implemented.After adopting the database optimization method,the efficiency of data query is obviously improved.Finally,according to the above analysis and combined with the advantages of Blu-ray disc including long service time,large capacity and fast query,we convert the disk array into Blu-ray disc and realize a disc storage system.This system mainly completes the file query,upload,download,share and other functions.After the replacement algorithm and database optimization,the system's query data efficiency has been greatly improved.