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Difference between the sga_target and sga_max_size

Last Modified: 2012-05-12

  I will appreciate to know about this two parameters :

     - The difference of each one.
     - What they do each one.
     - If i have set sga_target to 2 G and sga_max_size to 8 G, what is really the memory allocated by the SGA ?
     - Does it matter to increase the sga_max_size but not to increase the sga_target ?
     - I need to increse both parameters to have a better performance ?

Thanks  for the help.
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