Oracle查看系统运行情况常用SQL
1、查看系统当前连接会话数
select s.value,s.sid,a.username
from
v$sesstat S,v$statname N,v$session A
where
n.statistic#=s.statistic# and
name='session pga memory'
and s.sid=a.sid
order by s.value;
2、等待最多的用户
SELECT s.SID, s.username, SUM (a.wait_time + a.time_waited) total_wait_time
FROM v$active_session_history a, v$session s
WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE
GROUP BY s.SID, s.username
ORDER BY total_wait_time DESC;
3、查看死锁信息
SELECT (SELECT username
FROM v$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$lock b
WHERE a.BLOCK = 1 AND b.request > 0 AND a.id1 = b.id1 AND a.id2 = b.id2;
4、找使用CPU多的用户session
select a.sid,spid,status,substr(a.program,1,40) prog, a.terminal,osuser,value/60/100 value
from v$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;
5、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;
6,查询表空间的使用情况
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;
7、查询表空间总容量
select tablespace_name, sum(bytes) / 1024 / 1024 as MB
from dba_data_files
group by tablespace_name;
8、查看表空间下的所有表
select table_name from all_tables where TABLESPACE_NAME='TS_SJXT' //表空间要大写
9、查看表所在的表空间
select * from user_tables where table_name= 'ORBIT_IMAGE' / /表名要大写
Tag标签:「oracle 会话数 连接 表空间」更新时间:「2021-11-03 10:08:14」阅读次数:「963」