Oracle 性能慢排查脚本

查看总消耗时间最多的前100条SQL语句

select * from ( select v.sql_id,v.child_number,
v.sql_text,last_load_time,v.PARSING_USER_ID,
ROUND(v.ELAPSED_TIME / 1000000 / (CASE
 WHEN (EXECUTIONS = 0 OR NVL(EXECUTIONS, 1 ) = 1) THEN 1
 ELSE EXECUTIONS
 END),
 2) "执行时间'S'",
 v.SQL_FULLTEXT,v.cpu_time,v.disk_reads,
rank() over(order by v.elapsed_time desc) elapsed_rank
from v$sql v ) a
where elapsed_rank <= 100 and last_load_time > to_char(sysdate - 1/24, 'YYYY-MM-DD/HH:MI:SS') order by "执行时间'S'" desc

查询最近一小时内最慢的SQL

select executions, cpu_time/1e6 as cpu_sec, elapsed_time/1e6 as elapsed_sec, round(elapsed_time/sqrt(executions)) as important, v.* 
from v$sql v where executions > 10 and last_load_time > to_char(sysdate - 1/24, 'YYYY-MM-DD/HH:MI:SS') 
order by important desc

查看CPU消耗时间最多的前10条SQL语句

select * from 
( select v.sql_id,v.child_number,v.sql_text,v.elapsed_time,v.cpu_time,v.disk_reads,rank() over(order by v.cpu_time desc) elapsed_rank from v$sql v ) a
where elapsed_rank <= 10 

查看消耗磁盘读取最多的前10条SQL语句

select * from 
( select v.sql_id,v.child_number,v.sql_text,v.elapsed_time,v.cpu_time,v.disk_reads,rank() over(order by v.disk_reads desc) elapsed_rank from v$sql v ) a
where elapsed_rank <= 10