Answer / su

-Oracle is a database, you can store data(RDBMS, since it
follows more than 8 rule out of 12 proposed by E F Codd).
-Made up of memory structures and back ground processes.
-Memory structure - SGA (system global area) and PGA
(Process Global Area)
-Background Process are Database writer (DBWR) which
actually writes to the physical files (Data files), Log
Writer (LGWR) which writes to the physical log files
(important to get the database in consistent state if there
is a crash)
-Combination of memory structure and backgroung processes
gives us oracle instances , which is instrumental in
helping us work with the oracle database

:)

When the procedures or packagess become invalidate

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