The Oracle instance consists of the Oracle processes and shared memory necessary to access information in the database. The instance is made up of the user processes, the Oracle background processes, and the shared memory used by these processes.
The Oracle Memory Structure:
Oracle uses shared memory for several purposes, including caching of data and indexes as well as storing shared program code. This shared memory is broken into various pieces, or memory structures. The basic memory structures associated with Oracle are the System Global Area (SGA) and the Program Global Area (PGA).
The Oracle instance.
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