Which SQL should be tuned first?

I download top expensive SQL from T_Code ST04 as follows:

I want to know which kind of SQL should be observed at the first priority? The most total DiskRead, or most Reads/Exec, or most Execute times, or other?

Tanks for any input.

Execute DskRead Reads/Exec Bufgets Bgets/exec ProCrow Rproc/Exe Bgets/row

2	223,685	111,842.50	212,141	106,070.50	460,029	230,014.50	0.5
11	1215460	110,496.40	1532611	139,328.30	2,218,008	201,637.10	0.7
1	107,113	107,113.00	109,318	109,318.00	173,571	173,571.00	0.6
1	103,473	103,473.00	105,139	105,139.00	8,085	8,085.00	13
3	224,391	74,797.00	302,283	100,761.00	110,393	36,797.70	2.7
7	508,511	72,644.40	1,269,972	181,424.60	32,934	4,704.90	38.6
2	122,956	61,478.00	744,997	372,498.50	30,064	15,032.00	24.8
1	52,177	52,177.00	711,617	711,617.00	746	746	953.9
1	52,075	52,075.00	52,087	52,087.00	2,143	2,143.00	24.3
1	49,097	49,097.00	50,926	50,926.00	266	266	191.5
3	142,033	47,344.30	158,947	52,982.30	943	314.3	168.6

more line........

13,654	12,917	0.9	73,632	5.4	77,776	5.7	0.9
11,684	8,950	0.8	47,286	4	27,577	2.4	1.7
8,532	7,163	0.8	168,497	19.7	40,284	4.7	4.2
269,636	191,984	0.7	6,747,996	25	1,348,179	5	5
11,543	7,616	0.7	221,314	19.2	49,784	4.3	4.4
8,427	5,683	0.7	223,087	26.5	10,789	1.3	20.7
104,827	63,722	0.6	2,100,330	20	524,135	5	4

more lines..... Received on Sun Jun 11 2006 - 03:21:04 CDT