1. 检测数据库中的事件和等待
select event, total_waits, total_timeouts,time_waited, average_wait
from v$system_event
2. 查询会话中的事件和等待时间
select sid, event, total_waits,average_wait
from v$session_event where sid=10;
3. 查询等待进程
select sid, seq#, event, wait_time, state
from v$session_wait;
4. 监控全局区的性能
select * from v$sgastat;
5. 查询命中率
select gethitratio
from v$librarycache
where namespace = 'sql area';
6. 当前 sql 语句
select sql_text, users_executing,
executions, loads
from v$sqlarea;
7. 查询高速缓存中的命中率
select sum(pins) executions, sum(reloads) cache misses,
sum(reloads)/sum(pins)
from v$librarycache;
8. 查询全局字典中的有效装载次数
select namespace,pins,reloads,invalidations
from v$librarycache;
9. 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;
10. 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$filestat f, dba_data_files df
where f.file# = df.file_id
order by df.tablespace_name;
11. 监控文件系统的 i/o 比例
select substr(a.file#,1,2) #, substr(a.name,1,30) name,
a.status, a.bytes, b.phyrds, b.phywrts
from v$datafile a, v$filestat b
where a.file# = b.file#;
12. 在某个用户下找所有的索引
select user_indexes.table_name, user_indexes.index_name,uniqueness, column_name
from user_ind_columns, user_indexes
where user_ind_columns.index_name = user_indexes.index_name
and user_ind_columns.table_name = user_indexes.table_name
order by user_indexes.table_type, user_indexes.table_name,
user_indexes.index_name, column_position;
13. 监控 sga 中字典缓冲区的命中率
select parameter, gets,getmisses , getmisses/(gets+getmisses)*100 miss ratio,
(1-(sum(getmisses)/ (sum(gets)+sum(getmisses))))*100 hit ratio
from v$rowcache
where gets+getmisses 0
group by parameter, gets, getmisses;
14. 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;
15. 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;
16. 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$latch where name in ('redo allocation', 'redo copy');
17. 监控内存和硬盘的排序比率，最好使它小于 .10 ，增加 sort_area_size
select name, value from v$sysstat where name in ('sorts (memory)', 'sorts (disk)');
18. 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
19. 找 oracle 字符集
select * from sys.props$ where;
20. 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
21. 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);
22. 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;
23 、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;