Different sub-divisions of the SGA
Sample from svrmgrl SHOW SGA:
Total System Global Area 23460696 bytes
Fixed Size 72536 bytes
Variable Size 22900736 bytes
Database Buffers 409600 bytes
Redo Buffers 77824 bytes
Total System Global Area
-Total in bytes of all the sub-divisions that makes up the SGA.
-Contains general information about the state of the database and the instance,
which the background processes need to access. No user data is stored here.
This area is usually less than 100k in size.
-This section is influenced by the following init.ora parameters
See 'Approximationg size of the SGA' section for version specific information.
-Holds copies of data blocks read from datafiles.
size = db_block_buffers * block size
-A circular buffer in the SGA that holds information about changes made to
the database. Enforced mininum is set to 4 times the maximum database block
size for the host operating system.
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