1. 監(jiān)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;

　　1. 監(jiān)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. 回滾段的爭用情況

　　select name, waits, gets, waits/gets "Ratio"

　　from v$rollstat a, v$rollname b

　　where a.usn = b.usn;

　　3. 監(jiān)控表空間的 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. 監(jiān)控文件系統(tǒng)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.在某個用戶下找所有的索引

　　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. 監(jiān)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. 監(jiān)控 SGA 中字典緩沖區(qū)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. 監(jiān)控 SGA 中共享緩存區(qū)的命中率，應該小于1%

　　select sum(pins) "Total Pins", sum(reloads) "Total Reloads",