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常用性能监控语句  

2011-03-28 13:43:01|  分类: 常用脚本查询 |  标签: |举报 |字号 订阅

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Oracle常用性能监控SQL语句
--查看表锁
select * from sys.v_$sqlarea where disk_reads>100

--监控事例的等待
select event,sum(decode(wait_Time,0,0,1)) "Prev",
sum(decode(wait_Time,0,1,0)) "Curr",count(*) "Tot"
from v$session_Wait
group by event order by 4

--回滚段的争用情况
select name, waits, gets, waits/gets "Ratio"
from v$rollstat a, v$rollname b
where a.usn = b.usn

--查看前台正在发出的SQL语句
select user_name,sql_text
   from v$open_cursor
   where sid in (select sid from (select sid,serial#,username,program
   from v$session
   where status='ACTIVE'))

--数据表占用空间大小情况
select segment_name,tablespace_name,bytes,blocks
from user_segments
where segment_type='TABLE'
ORDER BY bytes DESC ,blocks DESC

--查看表空间碎片大小
    select tablespace_name,round(sqrt(max(blocks)/sum(blocks))*
           (100/sqrt(sqrt(count(blocks)))),2) FSFI
    from dba_free_space
    group by tablespace_name order by 1
   
--查看表空间占用磁盘情况
     select
             b.file_id                                 文件ID号,
             b.tablespace_name                         表空间名,
             b.bytes                                 字节数,
             (b.bytes-sum(nvl(a.bytes,0)))                 已使用,
             sum(nvl(a.bytes,0))                         剩余空间,
             sum(nvl(a.bytes,0))/(b.bytes)*100         剩余百分比
             from dba_free_space a,dba_data_files b
             where a.file_id=b.file_id
             group by b.tablespace_name,b.file_id,b.bytes
             order by b.file_id

--查看session使用回滚段
SELECT  r.name 回滚段名,
        s.sid,
        s.serial#,
        s.username 用户名,
        t.status,
        t.cr_get,
        t.phy_io,
        t.used_ublk,
        t.noundo,
        substr(s.program, 1, 78) 操作程序
FROM   sys.v_$session s,sys.v_$transaction t,sys.v_$rollname r
WHERE  t.addr = s.taddr and t.xidusn = r.usn
ORDER  BY t.cr_get,t.phy_io

--查看SGA区剩余可用内存
select name,
      sgasize/1024/1024        "Allocated(M)",
      bytes/1024            "自由空间(K)",
      round(bytes/sgasize*100, 2)   "自由空间百分比(%)"
   from   (select sum(bytes) sgasize from sys.v_$sgastat) s, sys.v_$sgastat f
   where  f.name = 'free memory'

--监控表空间I/O比例
select df.tablespace_name name,df.file_name "file",f.phyrds pyr,
       f.phyblkrd pbr,f.phywrts pyw, f.phyblkwrt pbw
from v$filestat f, dba_data_files df
where f.file# = df.file_id
order by df.tablespace_name

--监控SGA命中率
select a.value + b.value "logical_reads",
       c.value "phys_reads",
       round(100 * ((a.value+b.value)-c.value) / (a.value+b.value)) "BUFFER HIT RATIO"
from v$sysstat a, v$sysstat b, v$sysstat c
where a.statistic# = 38 and
      b.statistic# = 39 and
      c.statistic# = 40

--监控 SGA 中字典缓冲区的命中率
select parameter, gets,Getmisses , getmisses/(gets+getmisses)*100 "miss ratio",
(1-(sum(getmisses)/ (sum(gets)+sum(getmisses))))*100 "Hit ratio"
from v$rowcache
where gets+getmisses <>0
group by parameter, gets, getmisses

--监控 SGA 中共享缓存区的命中率,应该小于1%
select sum(pins) "Total Pins", sum(reloads) "Total Reloads",
sum(reloads)/sum(pins) *100 libcache
from v$librarycache

--监控 SGA 中重做日志缓存区的命中率,应该小于1%
SELECT name, gets, misses, immediate_gets, immediate_misses,
Decode(gets,0,0,misses/gets*100) ratio1,
Decode(immediate_gets+immediate_misses,0,0,
immediate_misses/(immediate_gets+immediate_misses)*100) ratio2
FROM v$latch WHERE name IN ('redo allocation', 'redo copy')

--监控内存和硬盘的排序比率,最好使它小于 .10
SELECT name, value
FROM v$sysstat
WHERE name IN ('sorts (memory)', 'sorts (disk)')

--监控字典缓冲区
SELECT SUM(GETS) "DICTIONARY GETS",SUM(GETMISSES) "DICTIONARY CACHE GET MISSES"
FROM V$ROWCACHE

--非系统用户建在SYSTEM表空间中的表
SELECT owner,table_name
FROM DBA_TABLES
WHERE tablespace_name in('SYSTEM','USER_DATA') AND
      owner NOT IN('SYSTEM','SYS','OUTLN', 'ORDSYS','MDSYS','SCOTT', 'HOSTEAC')

--性能最差的SQL
SELECT * FROM ( SELECT PARSING_USER_ID EXECUTIONS,SORTS,COMMAND_TYPE,DISK_READS,sql_text
                FROM v$sqlarea
                ORDER BY disk_reads DESC)
WHERE ROWNUM<100
                            
--读磁盘数超100次的sql
select * from sys.v_$sqlarea where disk_reads>100

--最频繁执行的sql
select * from sys.v_$sqlarea where executions>100

--查询使用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

--当前每个会话使用的对象数
SELECT a.sid,s.terminal,s.program,count(a.sid)
FROM V$ACCESS a,V$SESSION s
WHERE a.owner <> 'SYS'AND s.sid = a.sid
GROUP BY a.sid,s.terminal,s.program
ORDER BY count(a.sid)

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