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$system_event2. 查询会话中的事件和等待时间 select sid, event, total_waits,average_wait from v$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$latch WHERE name IN ("redo allocation", "redo copy");17. 监控内存和硬盘的排序比率,最好使它小于 .10 ,增加 sort_area_sizeSELECT name, value FROM v$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$librarycache;后者除以前者 , 此比率小于 1%, 接近 0% 为好select sum(gets) "dictionary gets",sum(getmisses) "dictionary cache get misses"from v$rowcache19. 找 Oracle 字符集 select * from sys.props$ where name="NLS_CHARACTERSET";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 wheretablespace_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;新解Oracle数据库DMP文件IMP时候的字符集不对应问题Oracle包和REF CURSOR相关资讯 Oracle教程
- Oracle中纯数字的varchar2类型和 (07/29/2015 07:20:43)
- Oracle教程:Oracle中查看DBLink密 (07/29/2015 07:16:55)
- [Oracle] SQL*Loader 详细使用教程 (08/11/2013 21:30:36)
| - Oracle教程:Oracle中kill死锁进程 (07/29/2015 07:18:28)
- Oracle教程:ORA-25153 临时表空间 (07/29/2015 07:13:37)
- Oracle教程之管理安全和资源 (04/08/2013 11:39:32)
|
本文评论 查看全部评论 (0)