List sessions with active transactions:
SELECT s.sid, s.serial#
FROM v$session s
WHERE s.saddr in
(SELECT t.ses_addr
FROM V$transaction t, dba_rollback_segs r
WHERE t.xidusn=r.segment_id
AND r.tablespace_name='RBS');Killing Sessions
Runaway processes can be killed on the UNIX side, or within server manager.
/* Kill a session, specified by the returned sess-id / serial number */
SELECT sid, serial#, username from v$session
ALTER SYSTEM KILL SESSION 'sessid,ser#'
----------------------------------------------
---------------------------------------------
A Simple Monitoring Tool
This tool loops a specified number of times, displaying memory usage along with user process counts for a specific username.
--=================================================
--
-- proc_ora_monitor
--
-- parm1: username to count
-- parm2: number of loops, 5 sec duration
--=================================================
set serveroutput on ;create or replace procedure
proc_ora_monitor ( user1 in varchar, reps1 in integer )
isi number ;
usercount1 number ;
memory1 number ;
date1 varchar(20) ;
msg varchar(99) ;begini := 0 ;while ( i < reps1 )
loop
msg := '=> ' || to_char(SYSDATE, 'HH:MM:SS PM'); select count(1)
into usercount1
from sys.v_$session
where username = user1 ; msg := msg || ', ' || user1 || ': ' || usercount1 ; select round(sum(bytes)/1024/1024 ,2)
into memory1
from sys.v_$sgastat
where pool = 'shared pool' and
name = 'free memory' ; msg := msg || ', free mb = ' || memory1 ; select round(sum(bytes)/1024/1024 ,2)
into memory1
from sys.v_$sgastat
where pool = 'shared pool' and
name = 'processes' ; msg := msg || ', processes mb = ' || memory1 ; dbms_output.put_line(msg) ; dbms_lock.sleep(5) ; i := i + 1 ;
end loop ;end;
/
show errors ;
execute proc_ora_monitor('SILVERUSER',2) ;exit
SELECT s.sid, s.serial#
FROM v$session s
WHERE s.saddr in
(SELECT t.ses_addr
FROM V$transaction t, dba_rollback_segs r
WHERE t.xidusn=r.segment_id
AND r.tablespace_name='RBS');Killing Sessions
Runaway processes can be killed on the UNIX side, or within server manager.
/* Kill a session, specified by the returned sess-id / serial number */
SELECT sid, serial#, username from v$session
ALTER SYSTEM KILL SESSION 'sessid,ser#'
----------------------------------------------
---------------------------------------------
A Simple Monitoring Tool
This tool loops a specified number of times, displaying memory usage along with user process counts for a specific username.
--=================================================
--
-- proc_ora_monitor
--
-- parm1: username to count
-- parm2: number of loops, 5 sec duration
--=================================================
set serveroutput on ;create or replace procedure
proc_ora_monitor ( user1 in varchar, reps1 in integer )
isi number ;
usercount1 number ;
memory1 number ;
date1 varchar(20) ;
msg varchar(99) ;begini := 0 ;while ( i < reps1 )
loop
msg := '=> ' || to_char(SYSDATE, 'HH:MM:SS PM'); select count(1)
into usercount1
from sys.v_$session
where username = user1 ; msg := msg || ', ' || user1 || ': ' || usercount1 ; select round(sum(bytes)/1024/1024 ,2)
into memory1
from sys.v_$sgastat
where pool = 'shared pool' and
name = 'free memory' ; msg := msg || ', free mb = ' || memory1 ; select round(sum(bytes)/1024/1024 ,2)
into memory1
from sys.v_$sgastat
where pool = 'shared pool' and
name = 'processes' ; msg := msg || ', processes mb = ' || memory1 ; dbms_output.put_line(msg) ; dbms_lock.sleep(5) ; i := i + 1 ;
end loop ;end;
/
show errors ;
execute proc_ora_monitor('SILVERUSER',2) ;exit
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----------------------
1. 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$session_Wait
group by event order by 4;
2. 回滚段的争用情况
select name, waits, gets, waits/gets "Ratio"
from v$rollstat a, v$rollname b
where a.usn = b.usn;
3. 监控表空间的 I/O 比例
select df.tablespace_name name,df.file_name "file",f.phyrds pyr,
f.phyblkrd pbr,f.phywrts pyw, f.phyblkwrt pbw
from v$filestat f, dba_data_files df
where f.file# = df.file_id
order by df.tablespace_name;
4. 监控文件系统的 I/O 比例
select substr(a.file#,1,2) "#", substr(a.name,1,30) "Name",
a.status, a.bytes, b.phyrds, b.phywrts
from v$datafile a, v$filestat b
where a.file# = b.file#;
6. 监控 SGA 的命中率
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$sysstat c
where a.statistic# = 38 and b.statistic# = 39
and c.statistic# = 40;
7. 监控 SGA 中字典缓冲区的命中率
select parameter, gets,Getmisses , getmisses/(gets+getmisses)*100 "miss ratio",
(1-(sum(getmisses)/ (sum(gets)+sum(getmisses))))*100 "Hit ratio"
from v$rowcache
where gets+getmisses <>0
group by parameter, gets, getmisses;
8. 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$librarycache;
select sum(pinhits-reloads)/sum(pins) "hit radio",sum(reloads)/sum(pins) "reload percent"
from v$librarycache;
10. 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$latch WHERE name IN ('redo allocation', 'redo copy');
11. 监控内存和硬盘的排序比率,最好使它小于 .10,增加 sort_area_size
SELECT name, value FROM v$sysstat WHERE name IN ('sorts (memory)', 'sorts (disk)');
13. 监控字典缓冲区
SELECT (SUM(PINS - RELOADS)) / SUM(PINS) "LIB CACHE" FROM V$LIBRARYCACHE;
SELECT (SUM(GETS - GETMISSES - USAGE - FIXED)) / SUM(GETS) "ROW CACHE" FROM V$ROWCACHE;
SELECT SUM(PINS) "EXECUTIONS", SUM(RELOADS) "CACHE MISSES WHILE EXECUTING" FROM V$LIBRARYCACHE;
后者除以前者,此比率小于1%,接近0%为好。
SELECT SUM(GETS) "DICTIONARY GETS",SUM(GETMISSES) "DICTIONARY CACHE GET MISSES"
FROM V$ROWCACHE
select busy/(busy+idle) "shared servers busy" from v$dispatcher;
此值大于0.5时,参数需加大
select sum(wait)/sum(totalq) "dispatcher waits" from v$queue where type='dispatcher';
select count(*) from v$dispatcher;
select servers_highwater from v$mts;
servers_highwater接近mts_max_servers时,参数需加大
16. 碎片程度
select tablespace_name,count(tablespace_name) from dba_free_space group by tablespace_name
having count(tablespace_name)>10;
alter tablespace name coalesce;
alter table name deallocate unused;
create or replace view ts_blocks_v as
select tablespace_name,block_id,bytes,blocks,'free space' segment_name from dba_free_space
union all
select tablespace_name,block_id,bytes,blocks,segment_name from dba_extents;
select * from ts_blocks_v;
select tablespace_name,sum(bytes),max(bytes),count(block_id) from dba_free_space
group by tablespace_name;
查看碎片程度高的表
SELECT segment_name table_name , COUNT(*) extents
FROM dba_segments WHERE owner NOT IN ('SYS', 'SYSTEM') GROUP BY segment_name
HAVING COUNT(*) = (SELECT MAX( COUNT(*) ) FROM dba_segments GROUP BY segment_name);18、找使用CPU多的用户session
12是cpu used by this 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;