It consists of
one or more data files.
one or
more control files.
two or more redo log files.
The Database contains
multiple users/schemas
one or more rollback segments
one or more tablespaces
Data
dictionary tables
User objects
(table,indexes,views etc.,)
The server that access the database consists of
SGA (Database buffer, Dictionary Cache Buffers, Redo log
buffers, Shared SQL pool)
SMON (System
MONito)
PMON
(Process MONitor)
LGWR
(LoG Write)
DBWR (Data
Base Write)
ARCH
(ARCHiver)
CKPT (Check Point)
RECO
Dispatcher
User Process
with associated PGS