Research On Technologies Of Rapid Accessing Big Data In Data Vault Of PDM System

There are lots of big data in Data Vault of PDM system such as two and three dimensional CAD graphics,technical documents,scaning images and photos etc.It's a key problem for PDM to access these data quickly.In order to secure some important data,the DBA will put some large-scale important drawings into the database. It will need high computer resource but the efficiency is very low when the traditional DBMS saving these data,this will affect the total efficiency of PDM system directly.so it's necessary to optimize the accessing process.In this way,not only we can use the advantage of DBMS,but also avoid the problem of heterogeneous data source and storage synchronization etc.After comparing and analyzing the ways of saving BLOB, the research of this paper is based on the aspects of database adjustability,selection of interfaces and design of application program etc.the main contents are as follows:(1)Ways of saving big data in file system and database system in PDM data vault,and introduce the advantages and disadvantages of each other.(2)Methods of accessing BLOB data and the adjustability of database.(3)Compare and analyse the visiting interface technology in the accessing of BLOB data.(4)Use of split and merge,data compression and memory mapping etc. in the application program.This subject aims at the trait of BLOB saving,through the adjustability and optimized methods to improve the efficiency of big data accessing in PDM data vault.