shell:~/sandboxes$ mysqlslap --query="Select col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,sum(col16) Total From nil_test.tab_MYISAM
Group By col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15" --delimiter=";" --user=root --password=root --iterations=10
Benchmark
	Average number of seconds to run all queries: 0.159 seconds
	Minimum number of seconds to run all queries: 0.000 seconds
	Maximum number of seconds to run all queries: 1.595 seconds
	Number of clients running queries: 1
	Average number of queries per client: 1

shell:~/sandboxes$
shell:~/sandboxes$ mysqlslap --query="Select col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15,sum(col16) Total From nil_test.tab_MYISAM FORCE INDEX (Multi_Col_Index) Group By col1,col2,col3,col4,col5,col6,col7,col8,col9,col10,col11,col12,col13,col14,col15" --delimiter=";" --user=root --password=root --iterations=10Benchmark
	Average number of seconds to run all queries: 0.102 seconds
	Minimum number of seconds to run all queries: 0.000 seconds
	Maximum number of seconds to run all queries: 1.025 seconds
	Number of clients running queries: 1
	Average number of queries per client: 1

shell:~/sandboxes$