Oracle 网上一些实用脚本归纳

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;

9 等待最多的用户

SELECT s.SID,
s.username,
SUM (a.wait_time + a.time_waited) total_wait_time
FROM v$active_session_history a, v$session s
WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE
GROUP BY s.SID, s.username
ORDER BY total_wait_time DESC;

10 等待最多的SQL

SELECT a.program,
a.session_id,
a.user_id,
d.username,
s.sql_text,
SUM (a.wait_time + a.time_waited) total_wait_time
FROM v$active_session_history a, v$sqlarea s, dba_users d
WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE
AND a.sql_id = s.sql_id
AND a.user_id = d.user_id
GROUP BY a.program, a.session_id, a.user_id, s.sql_text, d.username;

11 查看消耗资源最多的SQL

SELECT hash_value,
executions,
buffer_gets,
disk_reads,
parse
d21f
_calls
FROM V$SQLAREA
WHERE buffer_gets > 10000000 OR disk_reads > 1000000
ORDER BY buffer_gets + 100 * disk_reads DESC;

12 查看某条SQL语句的资源消耗

SELECT hash_value,
buffer_gets,
disk_reads,
executions,
parse_calls
FROM V$SQLAREA
WHERE hash_Value = 228801498
AND address = hextoraw('CBD8E4B0');

13 查询会话执行的实际SQL

SELECT a.SID,
a.username,
s.sql_text
FROM v$session a, v$sqltext s
WHERE a.sql_address = s.address
AND a.sql_hash_value = s.hash_value
AND a.status = 'ACTIVE'
ORDER BY a.username, a.SID, s.piece;

14 显示正在等待锁的所有会话

SELECT * FROM DBA_WAITERS;

15 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;

16 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;

17 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;

18 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;

19 查询数据库最大连接数

select value from v$parameter where name = 'processes';