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- 1 - Oracle 正常SQL 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$rollname b where a.usn=b.usn; 3.监控表空间的I/O 比例： select df.tablespace_name name,df.file_name "file",f.phyrds pyr,f.phyblkrd pbr,f.phywrts pyw, f.phyblkwrt pbw from v$filestat f,dba_data_files df where f.file#=df.file_id 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.进程监控： select distinct p.spid unix_process, s.terminal, - 2 - 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 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...