Oracle常用sql积累.txt - 墨天轮文档

Oracle常用sql积累.txt

墨天轮

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2021-05-08

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Oracle 查询表空间使用情况

--自己写的查询表空间的使用情况

select a.tablespace_name,

b.data_files as 数据文件个数,

b.total_bytes || 'GB' as "最大空间",

round(b.bytes / 1024 / 1024 / 1024, 4) || 'GB' as 当前分配空间 GB,

round(b.bytes / 1024 / 1024, 4) || 'MB' as 当前分配空间 MB,

(100 - round(a.bytes / b.total_bytes / (1024 * 1024 * 1024), 4) * 100)||'%'

as "未使用%"

from (select tablespace_name, sum(bytes) bytes, sum(blocks) blocks

from dba_free_space

group by tablespace_name) a,

(select tablespace_name,

count(*) as data_files,

round(sum(maxbytes) / 1024 / 1024 / 1024, 4) total_bytes,

sum(bytes) bytes,

sum(blocks) blocks

from dba_data_files

group by tablespace_name) b

where a.tablespace_name = b.tablespace_name

order by a.tablespace_name;

　--查询表空间使用情况

　　SELECT UPPER(F.TABLESPACE_NAME) "表空间名",

　　D.TOT_GROOTTE_MB "表空间大小(M)",

　　D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",

　　TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB *

100,2),'990.99') || '%' "使用比",

　　F.TOTAL_BYTES "空闲空间(M)",

　　F.MAX_BYTES "最大块(M)"

　　FROM (SELECT TABLESPACE_NAME,

　　ROUND(SUM(BYTES) / (1024 * 1024), 2) TOTAL_BYTES,

　　ROUND(MAX(BYTES) / (1024 * 1024), 2) MAX_BYTES

　　FROM SYS.DBA_FREE_SPACE

　　GROUP BY TABLESPACE_NAME) F,

　　(SELECT DD.TABLESPACE_NAME,

　　 ROUND(SUM(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB

　　FROM SYS.DBA_DATA_FILES DD

　　GROUP BY DD.TABLESPACE_NAME) D

　　WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME

　　ORDER BY 1;

　　--查询表空间的 free space

　　select tablespace_name,

　　count(*) as extends,

　　round(sum(bytes) / 1024 / 1024, 2) as MB,

　　sum(blocks) as blocks

　　from dba_free_space

　　group by tablespace_name;

　　--查询表空间的总容量

　　select tablespace_name, sum(bytes) / 1024 / 1024 as MB

　　from dba_data_files

　　group by tablespace_name;

　　--查询表空间使用率

　　select total.tablespace_name,

　　round(total.MB, 2) as Total_MB,

　　round(total.MB - free.MB, 2) as Used_MB,

　　round((1 - free.MB / total.MB) * 100, 2) || '%' as Used_Pct

　　from (select tablespace_name, sum(bytes) / 1024 / 1024 as MB

　　from dba_free_space

　　group by tablespace_name) free,

　　(select tablespace_name, sum(bytes) / 1024 / 1024 as MB

　　from dba_data_files

　　group by tablespace_name) total

　　where free.tablespace_name = total.tablespace_name;

1.查找当前表级锁的 SQL 如下：

select sess.sid,

sess.serial#,

lo.oracle_username,

lo.os_user_name,

ao.object_name,

lo.locked_mode

from v$locked_object lo,

dba_objects ao,

v$session sess

where ao.object_id = lo.object_id and lo.session_id = sess.sid;

2.杀掉锁表进程：

alter system kill session '436,35123';

3.RAC 环境中锁查找：

SELECT inst_id,DECODE(request,0,'Holder: ','Waiter: ')||sid sess,

id1, id2, lmode, request, type,block,ctime

FROM GV$LOCK

WHERE (id1, id2, type) IN

(SELECT id1, id2, type FROM GV$LOCK WHERE request>0)

ORDER BY id1, request;

4.监控当前数据库谁在运行什么 SQL 语句

select osuser, username, sql_text

from v$session a, v$sqltext b

where a.sql_address =b.address order by address, piece;

5.找使用 CPU 多的用户 session

select a.sid,spid,status,substr(a.program,1,40) prog,

a.terminal,osuser,value/60/100 value

from v$session a,v$process b,v$sesstat c

where c.statistic#=12 and

c.sid=a.sid and

a.paddr=b.addr

order by value desc;

6.查看死锁信息

SELECT (SELECT username

FROM v$session

WHERE SID = a.SID) blocker, a.SID, 'is blocking',

(SELECT username

FROM v$session

WHERE SID = b.SID) blockee, b.SID

FROM v$lock a, v$lock b

WHERE a.BLOCK = 1 AND b.request > 0 AND a.id1 = b.id1 AND a.id2 = b.id2;

7.具有最高等待的对象

SELECT o.OWNER,o.object_name, o.object_type, a.event,

SUM (a.wait_time + a.time_waited) total_wait_time

FROM v$active_session_history a, dba_objects o

WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE

AND a.current_obj# = o.object_id

GROUP BY o.OWNER,o.object_name, o.object_type, a.event

ORDER BY total_wait_time DESC;

SELECT a.session_id, s.osuser, s.machine, s.program, o.owner, o.object_name,

o.object_type, a.event,

SUM (a.wait_time + a.time_waited) total_wait_time

FROM v$active_session_history a, dba_objects o, v$session s

WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE

AND a.current_obj# = o.object_id

AND a.session_id = s.SID

GROUP BY o.owner,

o.object_name,

o.object_type,

a.event,

a.session_id,

s.program,

s.machine,

s.osuser

ORDER BY total_wait_time DESC;

8.查询当前连接会话数

select s.value,s.sid,a.username

from

v$sesstat S,v$statname N,v$session A

where

n.statistic#=s.statistic# and

name='session pga memory'

and s.sid=a.sid

order by s.value;

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