Oracle Server Architecture

• There are two tiers in oracle client tier and server tier.
• Client tierconsist of two components they are

1. User
2. Processes

• Server tierhas three components they are.

1. Server Process that execute SQL
2. The Instance
3. The Database itself

• Each user will interact with -> user process.
• Each user process interact with -> a server process
• Each sever process interact with -> instance and database
• User& server makeup as a session launched on demand of user
• Instance & memory structure are launched by DB Admin
• User processit can be any client-side softwarecapable of connecting to oracle server process. Eg:- SQL*Plus & SQL Developer.
• RAC– Real Application Cluster it provide more flexibility performance& zero down time, It can ability to add dynamically more instance running on more node to DB.

                                                              Oracle Server Architecture

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