select
executions,
disk_reads,
buffer_gets,
round((buffer_gets - disk_reads) / buffer_gets, 2) hit_radio,
round(disk_reads / executions, 2) reads_per_run,
sql_text
from v$sqlarea
where executions > 0 and buffer_gets > 0 and (buffer_gets - disk_reads) / buffer_gets < 0.8
order by 2 desc;
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