Different two-tier works, the operation of the software on a Client and then send it to continue on the DB server will be accessed directly.Three-tier prevent us to run straight through the DB Server, we must work to prevent the attack or to Hathaway, the DB Server, click the define User should use.? in the database, you will see the system frequently, such as in the Web site, we will not directly, but when we called DB Web server Web server is called DB, we have to know that this User should have rights to do anything to the system.
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