BU415 Lecture Notes - Lecture 4: Scalability, Platform As A Service, Software As A Service
Document Summary
Proliferation of data generated by sensors, machines, and humans. Computing architectures: mainframes + terminals: a large digital computer supporting multiple users and multiple peripherals accessed by (cid:858)du(cid:373)b(cid:859) ter(cid:373)i(cid:374)als. Personal computers are full-fledged digital computers can execute instructions + run software applications independently: distributed architecture. 2 very popular client-server designs : 3 tier architecture, peer-to-peer architecture. Computing architectures: cloud computing: applications / computational / storage components = building blocks of it solutions, reside online in the cloud accessed by clients through internet infrastructure. Scalability = flexible allows customers to acquire different services like storage / processing capacity. Software as a service (saas): application runs in the cloud. Platform as a service (paas): when what is being rented from the provider is not a full-fledged application a platform which the client builds its own applications. Infrastructure as a service (iaas): level closest to hardware: client purchases the use of hardware functionality. Computational power, storage capacity, network connectivity: all software are your responsibility.
