The SGA means 'shared global area' or 'system global area' in a Oracle database is the area in memory to facilitate the transfer of information between users.. This is the shared memory that's allocated from the O/S at instance startup. It is SHARED. It holds the most recently requested structural information about the database. The structure is database buffers, dictionary cache, redo log buffer and shared pool area.

The SGA means 'shared global area' or 'system global area' in a Oracle database is the area in memory to facilitate the transfer of information between users.. This is the shared memory that's allocated from the O/S at instance startup. It is SHARED. It holds the most recently requested structural information about the database. The structure is database buffers, dictionary cache, redo log buffer and shared pool area.