2-tier architecture
In two-tier client/server architectures, the client interface is usually located in the user's desktop environment and the database management services are in a more powerful server that services many clients. The user system interface environment and the database management server environment split the processing management duties. The database management server contains stored procedures and triggers.
3-tier architecture
The prototypical three-tier architecture has a middle layer comprising a Transaction Processing (TP) monitor. The TP monitor employs a type of message queuing, transaction scheduling, and prioritization service where the client connects to the TP monitor—middle tier—instead of the database server. The transaction is accepted by the monitor, which queues it, and then takes responsibility for completion, thereby freeing up the client.
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