Confusion on shared buffer

In some docs i read that shared buffer must be increased based on the maximum dataset size. For my scenario the dataset size is relative small less then a Gb, but database#  handled by a server is nearly 200db per server and average connection# to server will be >500 (approx 5/per each DB). So for this scenario will increase in shared buffer will increase the performance.
FYI: RAM in 8GB

Regards,
Arvind S


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