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We ve reached the last piece of the architecture puzzle. We ve investigated the database and the set of physical files that constitute a database. In covering the memory used by Oracle, we ve looked at one half of an instance. The last remaining architectural issue to cover is the set of processes that constitute the other half of the instance. Each process in Oracle will perform a particular task or set of tasks, and each will have internal memory (PGA memory) allocated by it to perform its job. An Oracle instance has three broad classes of processes: Server processes: These perform work based on a client s request. We have already looked at dedicated and shared servers to some degree. These are the server processes. Background processes: These are the processes that start up with the database and perform various maintenance tasks, such as writing blocks to disk, maintaining the online redo log, cleaning up aborted processes, maintaining Automatic Workload Repository (AWR) and so on. Slave processes: These are similar to background processes, but they are processes that perform extra work on behalf of either a background or a server process. java android qr code scanner Reading QR codes in Java - YouTube
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