AWR Memory Advisors

I have the following memory advisors from the AWR; I would like to know how to interpret these results?
PGA Memory Advisory:
"PGA Target Est (MB)","Size Factr","W/A MB Processed","Estd Extra    W/A MB Read/   Written to Disk ","Estd PGA Cache Hit %","Estd PGA Overalloc Count","Estd Time"
"138","0.99","90,700.12","11,521.57","84.00","214","788.090,200"
"326","0.15","90,700.12","18,015.29","86.00","94","937,669,120"

Hi,
These table function in a 'what-if' manner.
If you would increase the shared_pool size with a factor 2 then what would happen to the e.g. the number of physical reads.
Your output looks a bit strange to me however. It's either a very perfectly tuned system, or one that has no resources left.
In our 11g db the SGA_TARGET_ADVICE looks e.g. like below. It has more deviation between the several size factor values:
ESTD_DB_TIME ESTD_DB_TIME_FACTOR ESTD_PHYSICAL_READS   SGA_SIZE SGA_SIZE_FACTOR
     8988151                   1           789178493      13312               1
    11408661              1.2693          1282888558       4992            .375
    10053248              1.1185          1006360414       6656              .5
     9700014              1.0792           936518118       8320            .625
     9304536              1.0352           855311651       9984             .75
     9099608              1.0124           812301423      11648            .875
     8937822               .9944           781286708      14976           1.125
     8886590               .9887           769527949      16640            1.25
     8834460               .9829           758163778      18304           1.375
     8762557               .9749           745536922      19968             1.5
     8583693                .955           702132127      21632           1.625
     8568413               .9533           702132127      23296            1.75
     8567514               .9532           676483826      24960           1.875
     8567514               .9532           676483826      26624               2HTH
FJFranken

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