Top SQLs by Disk Read via V$SQLAREA

with base_data as   (   select   v.HASH_VALUE,   disk_reads,   executions,   v.CPU_TIME,   sql_text,   v.FIRST_LOAD_TIME  from v$sqlarea v  order by 2 desc, 3 desc  )  select  sysdate snaptime,  null hash_value,  sum(disk_reads) disk_reads,  sum(executions) executions,  sum(cpu_time)   cpu_time,  '!ALL SQL SUMMARY' SQL_TEXT,  NULL first_load_time  from base_data  union all  select    sysdate,  HASH_VALUE,  disk_reads,  executions,  CPU_TIME,  sql_text,  FIRST_LOAD_TIME from base_data  where rownum <=20