Oracle查询表空间使用情况
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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 asMB
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,考试大论坛
round(total.MB - free.MB, 2) as Used_MB,
round((1 - free.MB / total.MB) * 100, 2) || '%' asUsed_Pct
from (select tablespace_name, sum(bytes) / 1024 / 1024 asMB
from dba_free_space
group by tablespace_name) free,
(select tablespace_name, sum(bytes) / 1024 / 1024 asMB
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,
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: ')||sidsess,
FROM GV$LOCK
WHERE (id1, id2, type) IN
ORDER BY id1, request;
4.监控当前数据库谁在运行什么SQL语句
select osuser, username, sql_text
from
where
5.找使用CPU多的用户session
select a.sid,spid,status,substr(a.program,1,40) prog,a.terminal,osuser,value/60/100 value
from
where
6.查看死锁信息
SELECT (SELECT username
7.具有最高等待的对象
SELECT
GROUP BY o.OWNER,o.object_name, o.object_type, a.event
ORDER BY total_wait_time DESC;
SELECT
GROUP BY o.owner,
ORDER BY total_wait_time DESC;
8.查询当前连接会话数
select s.value,s.sid,a.username
from
v$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
GROUP BY s.SID, s.username
ORDER BY total_wait_time DESC;
10.等待最多的SQL
SELECT
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_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
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;
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