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VPN technology is the use of the knowledge of cryptography in the open and public network to establish a virtual private network. IPSec VPN and SSL VPN are two kinds of VPN technology and products used in most cases currently. IPSec VPN operates at the network layer, SSL VPN works in secure sockets layer. SSL VPN uses a series of cryptographic techniques, including symmetric encryption, asymmetric encryption, digital signatures, digital certificates, as well as message digest algorithm. This article analyzes the principle of VPN technology and the SSL protocol. I proposed a solution of VPN gateway based on the SSL protocol.

With the increasing amount of data of information system, it is necessary to adjust the performance of oracle database and optimization, in order to meet the demand of long-term use of the information system's data. In this article, based on oracle database performance evaluation and influence factors analysis, we choose a method for better improvement and study of oracle memory structure, and find a way to adjust and optimize the memory allocation, after that apply it to the existing information system. Finally, through the comparison of the oracle database performance change, we come up with the idea that adjust memory allocation can improve database performance of information systems.