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常用管理sql

原创 Linux操作系统 作者:lxq1985 时间:2010-02-22 10:23:02 0 删除 编辑

常用监控SQL

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(*)
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$rollname b where a.usn=b.usn;
3.监控表空间的I/O比例:
select df.tablespace_name name,df.file_name "ile",f.phyrds pyr,f.phyblkrd pbr,f.phywrts pyw,
f.phyblkwrt pbw
from v$filestat f,dba_data_files df
where f.file#=df.file_id
4.监空文件系统的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#
5.在某个用户下找所有的索引:
select user_indexes.table_name, user_indexes.index_name,uniqueness, column_name
from user_ind_columns, user_indexes
where user_ind_columns.index_name = user_indexes.index_name
and user_ind_columns.table_name = user_indexes.table_name
order by user_indexes.table_type, user_indexes.table_name,
user_indexes.index_name, column_position;
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;

9. 显示所有数据库对象的类别和大小

select count(name) num_instances ,type ,sum(source_size) source_size ,
sum(parsed_size) parsed_size ,sum(code_size) code_size ,sum(error_size) error_size,
sum(source_size) +sum(parsed_size) +sum(code_size) +sum(error_size) size_required
from dba_object_size
group by type order by 2;

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)');


12. 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;

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

14. 找ORACLE字符集

select * from sys.props$ where name='NLS_CHARACTERSET';

15. 监控 MTS

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) "ispatcher 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);

17. 表、索引的存储情况检查

select segment_name,sum(bytes),count(*) ext_quan from dba_extents where
tablespace_name='&tablespace_name' and segment_type='TABLE' group by tablespace_name,segment_name;

select segment_name,count(*) from dba_extents where segment_type='INDEX' and wner='&wner'
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;

20.监控log_buffer的使用情况:(值最好小于1%,否则增加log_buffer 的大小)
select rbar.name,rbar.value,re.name,re.value,(rbar.value*100)/re.value||'%' "radio"
from v$sysstat rbar,v$sysstat re
where rbar.name='redo buffer allocation retries'
and re.name='redo entries';


19、查看运行过的SQL语句:

SELECT SQL_TEXT
FROM V$SQL

20.select distinct
       p.spid unix_process,
       s.terminal,
       to_char(s.logon_time,'YYYY/MON/DD HH24:MI') Logon_Time,
       s.username
from v$process p, v$session s
where p.addr=s.paddr order by 2

SQL语句:
表:
  select * from cat;
  select * from tab;
  select table_name from user_tables;
视图:
  select text from user_views where view_name=upper('&view_name');
索引:
  select index_name,table_owner,table_name,tablespace_name,status from user_indexes order by table_name;
触发器:
  select trigger_name,trigger_type,table_owner,table_name,status from user_triggers;
快照:
  select owner,name,master,table_name,last_refresh,next from user_snapshots order by owner,next;
同义词:
  select * from syn;
序列:
  select * from seq;
数据库链路:
  select * from user_db_links;
约束限制:
  select TABLE_NAME,CONSTRAINT_NAME,SEARCH_CONDITION,STATUS
from user_constraints WHERE TABLE_name=upper('&TABLE_Name');
本用户读取其他用户对象的权限:
  select * from user_tab_privs;
本用户所拥有的系统权限:
  select * from user_sys_privs;
用户:
  select * from all_users order by user_id;
表空间剩余自由空间情况:
  select tablespace_name,sum(bytes) 总字节数,max(bytes),count(*) from dba_free_space group by tablespace_name;
数据字典:
  select table_name from dict order by table_name;
锁及资源信息:
  select * from v$lock;不包括DDL锁
数据库字符集:
  select name,value$ from props$ where name='NLS_CHARACTERSET';
inin.ora参数:
  select name,value from v$parameter order by name;
SQL共享池:
  select sql_text from v$sqlarea;
数据库:
  select * from v$database
控制文件:
  select * from V$controlfile;
重做日志文件信息:
  select * from V$logfile;
来自控制文件中的日志文件信息:
  select * from V$log;
来自控制文件中的数据文件信息:
  select * from V$datafile;
NLS参数当前值:
  select * from V$nls_parameters;
ORACLE版本信息:
  select * from v$version;
描述后台进程:
  select * from v$bgprocess;
查看版本信息:
  select * from product_component_version;

来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/13636837/viewspace-627453/,如需转载,请注明出处,否则将追究法律责任。

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