What are the components of SGA?

SGA is used to store shared information across all database users.It mainly includes Library cache, Data Dictionary cache, Database Buffer Cache, Redo log Buffer cache, Shared Pool.

Library cache - It is used to store Oracle statements.
Data Dictionary Cache - It contains the definition of Database objects and privileges granted to users.
Data Base buffer cache - It holds copies of data blocks which are frequently accessed so that they can be retrieved faster for any future requests.
Redo log buffer cache - It records all changes made to the data files. 

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