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转自卓玛的博客-关于oracle的日常监控

原创 Linux操作系统 作者:mugen 时间:2019-05-08 16:27:04 0 删除 编辑

http://blog.itpub.net/post/22/281

我觉得很不错,就贴不来了。希望卓玛别介意


http://blog.itpub.net/post/22/281

主要用于监控数据库性能的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(*) "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#;

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) "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);

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 owner='&owner'
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;
--------------------------------------------------------------------------------
spool c:dbname.txt

--LIST DB NAME
SELECT * FROM GLOBAL_NAME;

--LIST TABLESPACES
select tablespace_name,max_extents,pct_increase,status from dba_tablespaces;

--LIST DB DATA FILES
column tablespace_name format A16;
column file_name format A46;
select file_name,round(bytes/(1024*1024),0) total_space,AUTOEXTENSIBLE,INCREMENT_BY*4096/(1024*1024),MAXBYTES/(1024*1024) from dba_data_files order by tablespace_name;


--LIST TABLEASPACE USAGE
select * from( select sum(bytes)/(1024*1024) as "free_space(M)",tablespace_name
from dba_free_space
group by tablespace_name) order by "free_space(M)";

--LIST ROLLBACK SEGMENT
column segment_name format A10;
column tablespace_name format A16;
column status format A10;

select segment_name,
tablespace_name, r.status,
(initial_extent/1024) "InitialExtent(K)",
(next_extent/1024) "NextExtent(K)",
max_extents "max_extents(K)", v.curext "CurExtent(K)"
From dba_rollback_segs r, v$rollstat v
Where r.segment_id = v.usn(+)
order by segment_name ;

--LIST CONTROL FILES
select name "control file name" from v$controlfile;

--LIST LOG FILES
select member "log file name" from v$logfile;

--LIST VERSION OF ORACLE
Select version "oracle version" FROM Product_component_version
Where SUBSTR(PRODUCT,1,6)='Oracle';

--LIST CREATED DATE AND LOG_MODE OF ORACLE
Select Created "db created time", Log_Mode From V$Database;

--LIST SGA SIZE
select sum(value)/(1024*1024) "sga size" from v$sga;

--LIST CUREENT SESSIONS
select count(*) "current user number",username "current username" from v$session group by username;

--LIST DB USERS AND THEIR DEFAULT TABLESPACE
select username,default_tablespace,temporary_tablespace from dba_users;

-- list quata of users

select * from DBA_TS_QUOTAS order by Tablespace_Name, Username;

--LIST REPORT TIME
select sysdate "report time" from dual;

spool off;

---------------------------------------------------------

-- free.sql
--
-- To verify free space in tablespaces
-- Minimum amount of free space
-- document your thresholds:
-- = m

SELECT tablespace_name, sum ( blocks ) as free_blk , trunc ( sum ( bytes ) / (1024*1024) ) as free_m
, max ( bytes ) / (1024) as big_chunk_k, count (*) as num_chunks
FROM dba_free_space
GROUP BY tablespace_name
/

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