i was going thorw with Automatic Memory Management (AMM) on 11g [ID 443746.1] document.
as per current status, one of my DB which is 11.2.0.2 having below memory setting.
MEMORY_MAX_SIZE=9G
MEMORY_TARGET = 9G
PGA_AGGREGATE_TARGET =7G
SGA_MAX_SIZE = 9G
SGA_TARGET = 0
as per above mentioned document below line from that document is applicable to above my setting.
If PGA_AGGREGATE_TARGET is set and SGA_TARGET is not set, we will still auto-tune both parameters. SGA_TARGET will be initialized to the minimum non-zero value of MEMORY_TARGET - PGA_AGGREGATE_TARGET and SGA_MAX_SIZE and will auto tune its components.
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