Id	 Operation           Name    	 Rows  	 Bytes 	TempSpc	 Cost    (%CPU)

 0     SELECT STATEMENT                  1833K	  85M            21993    (6)
 1     SORT GROUP BY                     1833K	  85M    225M	 21993    (6)
 2     TABLE ACCESS FULL     BIG_TABLE   1833K	  85M             2417    (12)