Research and implementation of database security mechanism

Database technology is becoming the foundation and core of computer technology.The data in the database will be suffered a lot of attack,in order to protect the safety of the data;database provides all levels of authentication mechanism,to prevent the user from illegal loading;provides the server role,database roles and permissions to restrict user login operation;provides data encryption,even if the user gets data also need to decrypt that data can be read correctly.Trigger is also can be used as an auxiliary means to protect data security.