orcale 查询执行sql的效率的sql
SELECT *
FROM v$sqlarea v
WHERE executions > 0
AND buffer_gets > 0
AND (buffer_gets - disk_reads) / buffer_gets < 0.8
ORDER BY v.USER_IO_WAIT_TIME DESC


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 v
WHERE v.PARSING_SCHEMA_NAME = 'JUQI'
AND executions > 0
AND buffer_gets > 0
AND (buffer_gets - disk_reads) / buffer_gets < 0.8
ORDER BY 4 DESC