Oracle = Instance + Database File
1A) Instance [ SGA + Background Services]
2A) database file [ control file, datafile , redolog file]
SGA
1)Share pool [ library cache , data dictonary cache]
2)database buffer cache
3)Redolog buffer
Background servies
1) Pmon
2) Smon
3) DBWR
4) LGWR
5) CKPT
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