Oracle運維常用SQL

oracle處理資料緩慢，系統相應緩慢，除了排查**、網路，資料庫也不可忽視，下面一些語句可以篩查需要進行調優的sql、oracle設定等。

select *

from (select sa.sql_text,
sa.sql_fulltext,
sa.executions "執行次數",
round(sa.elapsed_time / 1000000, 2) "總執行時間",
round(sa.elapsed_time / 1000000 / sa.executions, 2) "平均執行時間",
sa.command_type,
sa.parsing_user_id "使用者id",
u.username "使用者名稱",
s.executions "執行次數",
s.parsing_user_id "使用者名稱",
rank() over(order by executions desc) exec_rank
from v$sql s
left join all_users u
on u.user_id = s.parsing_user_id) t
where exec_rank <= 100;

select table_name,total_phys_io

from ( select owner||'.'||object_name as table_name,
sum(value) as total_phys_io
from v$segment_statistics
where owner!='sys' and object_type='table'
and statistic_name in ('physical reads','physical reads direct',
'physical writes','physical writes direct')
group by owner||'.'||object_name
order by total_phys_io desc)
where rownum <=10;

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.elapsed_time desc) elapsed_rank
from v$sql v) a
where elapsed_rank <= 10;

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;

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;

1.查詢被鎖的表：

select b.owner,b.object_name,a.session_id,a.locked_mode
from v$locked_object a,dba_objects b
where b.object_id = a.object_id
2.查詢鎖表的程序
select b.username,b.sid,b.serial#,logon_time
from v$locked_object a,v$session b
where a.session_id = b.sid order by b.logon_time
3.kill程序
alter system kill session 'sid,serial#';
4.原被鎖的oracle使用者提示「已斷開連線，請重新登入"，解鎖完成。

記錄部分常用sql，持續更新。希望對各位讀者有所幫助。

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