linux的oracle的cpu过高分析

根据linux的oracle进程号查询正在执行的sql

SELECT

sql_text

FROM v$sqltext a

WHERE (a.hash_value, a.address) IN

(SELECT DECODE(sql_hash_value, 0, prev_hash_value, sql_hash_value),

DECODE(sql_hash_value, 0, prev_sql_addr, sql_address)

FROM v$session b

WHERE b.paddr =

(SELECT addr FROM v$process c WHERE c.spid = '&pid'))

ORDER BY piece ASC

获取耗时的前10条sql

select *

from (select v.sql_id,

v.child_number,

v.sql_fulltext,

v.elapsed_time,

v.cpu_time,

v.disk_reads,

rank() over(order by v.elapsed_time desc) elapsed_rank

from v$sql v) a

where elapsed_rank <= 10

ORDER BY cpu_time desc;

sql执行计划

EXPLAIN PLAN FOR select questionid,mark from zeanswerdetail where username=:1 and paperid =:2 and questionid=:3 and answerid=:4 ;

select * from table(DBMS_XPLAN.DISPLAY);