select * from (select sql_text,sql_id,cpu_time from v$sql order by cpu_time desc) where rownum<=10 order by rownum asc ;
select * from (select sql_text,sql_id,cpu_time from v$sqlarea order by cpu_time desc) where rownum<=10 order by rownum asc ;
这2个语句效果基本一样，一个从v$sql视图查询一个从v$sqlarea视图查询。
列出使用频率最高的5个查询：
select
sql_text,executions
from
(
select
sql_text,executions,
rank() over
(
order
by
executions
desc
) exec_rank
from
v$sql)
where
exec_rank <=5;
消耗磁盘读取最多的sql top5：
select
disk_reads,sql_text
from
(
select
sql_text,disk_reads,
dense_rank() over
(
order
by
disk_reads
desc
) disk_reads_rank
from
v$sql)
where
disk_reads_rank <=5;
找出需要大量缓冲读取（逻辑读）操作的查询：
select
buffer_gets,sql_text
from
(
select
sql_text,buffer_gets,
dense_rank() over
(
order
by
buffer_gets
desc
) buffer_gets_rank
from
v$sql)
where
buffer_gets_rank<=5;