Infs2608 Notes

Now this is coming back due to cloud computing  something like this. File-Server o File-server is connected to several workstations across a network. Database resides on file-server. o Difference is the stations are not dumb terminals but actually have the database applications (e.g. Oracle DBMS) on the individual machines. Only the data is stored on the file service. o DBMS and applications run on each workstation. o Disadvantages include: Significant network  traffic. Copy of DBMS on each  workstation. Concurrency, recovery  and integrity control more complex E.g. Which DBMS is responsible for it? Need to physical store copies of DMBS on each of the application Need a lot of network power. o

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Traditional Two-Tier Client-Server 

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Client (tier 1) manages user interface and runs applications. Server (tier 2) holds database and DBMS. Advantages include: o wider access to existing databases; o increased performance; o possible reduction in hardware costs; o reduction in communication costs; o Increased consistency.