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a dbwr process writes from memory to disk so that once u shutdown ur database every thing that u previously had in ur memory (for faster procesing) in written safely to disk.
what wud be a reader process in oracle doing?....u are the reader who wants to read useful information out of oracle db, once u connect to oracle a server session is created on your behalf that reads data from disk and places it to memory(buffer cache)...so there are as many server processes or reader processes (as u may call them) as # of users that connect to the database or sql.
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