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Impact of resetting sga_target

xoxomos
xoxomos asked
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Last Modified: 2014-12-07
We've just made changes to increase memory and implement hugepages.  One of the objectives was to also increase db_cache_size to 26G, but got an error saying there was not enough memory.  We have 64G memory with 42G in sga and 7G in pga.  in our parameter file i have both sga_max and sga_target.  I see someone that got the same error resolved the problem by setting sga_target =0 then alter system set db_cache_size to desired size.  
My question is since the application is up, what's the impact of setting sga_target to 0 while there are users on the system?
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