 
SELECT v1.file_name,v1.file_id, 
num1 totle_space, 
num3 free_space, 
num1-num3 Used_space, 
nvl(num2,0) data_space, 
num1-num3-nvl(num2,0) file_head 
FROM 
(SELECT file_name,file_id,SUM(bytes) num1 FROM Dba_Data_Files GROUP BY file_name,file_id) v1, 
(SELECT file_id,SUM(bytes) num2 FROM dba_extents GROUP BY file_id) v2, 
(SELECT file_id,SUM(BYTES) num3 FROM DBA_FREE_SPACE GROUP BY file_id) v3 
WHERE v1.file_id=v2.file_id(+) 
AND v1.file_id=v3.file_id(+); 

(運(yùn)行以上查詢，我們可以如下信息：

復(fù)制代碼代碼如下:

 
Totle_pace:該數(shù)據(jù)文件的總大小，字節(jié)為單位 
Free_space:該數(shù)據(jù)文件的剩于大小，字節(jié)為單位 
Used_space:該數(shù)據(jù)文件的已用空間，字節(jié)為單位 
Data_space:該數(shù)據(jù)文件中段數(shù)據(jù)占用空間，也就是數(shù)據(jù)空間，字節(jié)為單位 
File_Head:該數(shù)據(jù)文件頭部占用空間，字節(jié)為單位) 

數(shù)據(jù)庫(kù)各個(gè)表空間增長(zhǎng)情況的檢查：

復(fù)制代碼代碼如下:

 
SQL>select A.tablespace_name,(1-(A.total)/B.total)*100 used_percent 
From (select tablespace_name,sum(bytes) total from dba_free_space group by tablespace_name) A,(select tablespace_name,sum(bytes) total from dba_data_files group by tablespace_name) B where A.tablespace_name=B.tablespace_name; 
SQL>SELECT UPPER(F.TABLESPACE_NAME) "表空間名", 
D.TOT_GROOTTE_MB "表空間大小(M)", 
D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空間(M)", TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100, 2), '990.99') "使用比", F.TOTAL_BYTES "空閑空間(M)", 
F.MAX_BYTES "最大塊(M)" FROM (SELECT TABLESPACE_NAME, 
ROUND(SUM(BYTES) / (1024 * 1024), 2) TOTAL_BYTES, 
ROUND(MAX(BYTES) / (1024 * 1024), 2) MAX_BYTES 
FROM SYS.DBA_FREE_SPACE GROUP BY TABLESPACE_NAME) F, 
(SELECT DD.TABLESPACE_NAME,ROUND(SUM(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB FROM SYS.DBA_DATA_FILES DD 
GROUP BY DD.TABLESPACE_NAME) D WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME 
ORDER BY 4 DESC; 

查看各個(gè)表空間占用磁盤情況:

復(fù)制代碼代碼如下:

 
SQL>col tablespace_name format a20; 
SQL>select b.file_id file_ID, 
b.tablespace_name tablespace_name, 
b.bytes Bytes, 
(b.bytes-sum(nvl(a.bytes,0))) used, 
sum(nvl(a.bytes,0)) free, 
sum(nvl(a.bytes,0))/(b.bytes)*100 Percent 
from dba_free_space a,dba_data_files b 
where a.file_id=b.file_id 
group by b.tablespace_name,b.file_id,b.bytes 
order by b.file_id; 

數(shù)據(jù)庫(kù)對(duì)象下一擴(kuò)展與表空間的free擴(kuò)展值的檢查：

復(fù)制代碼代碼如下:

 
SQL>select a.table_name, a.next_extent, a.tablespace_name 
from all_tables a,(select tablespace_name, max(bytes) as big_chunk 
from dba_free_space group by tablespace_name ) f where f.tablespace_name = a.tablespace_name and a.next_extent > f.big_chunk 
union select a.index_name, a.next_extent, a.tablespace_name 
from all_indexes a,(select tablespace_name, max(bytes) as big_chunk 
from dba_free_space group by tablespace_name ) f where f.tablespace_name = a.tablespace_name and a.next_extent > f.big_chunk; 

Disk Read最高的SQL語(yǔ)句的獲?。?

復(fù)制代碼代碼如下:

 
SQL>select sql_text from (select * from v$sqlarea order by disk_reads) 
where rownum<=5; 

查找前十條性能差的sql

復(fù)制代碼代碼如下:

 
SELECT * FROM (SELECT PARSING_USER_ID 
EXECUTIONS,SORTS,COMMAND_TYPE,DISK_READS, 
sql_text FROM v$sqlarea ORDER BY disk_reads DESC) 
WHERE ROWNUM<10 ; 

等待時(shí)間最多的5個(gè)系統(tǒng)等待事件的獲?。?

復(fù)制代碼代碼如下:

 
SQL>select * from (select * from v$system_event where event not like 'SQL%' order by total_waits desc) where rownum<=5; 

查看當(dāng)前等待事件的會(huì)話:

復(fù)制代碼代碼如下:

 
col username format a10 
set line 120 
col EVENT format a30 
select SE.Sid,s.Username,SE.Event,se.Total_Waits,SE.Time_Waited,SE.Average_Wait 
from v$session S,v$session_event SE where S.Username is not null and SE.Sid=S.Sid 
and S.Status='ACTIVE' and SE.Event not like '%SQL*Net%'; 
select sid, event, p1, p2, p3, wait_time, seconds_in_wait, state from v$session_wait where event not like '%message%' and event not like 'SQL*Net%' and event not like '%timer%' and event != 'wakeup time manager'; 

找到與所連接的會(huì)話有關(guān)的當(dāng)前等待事件：

復(fù)制代碼代碼如下:

 
select SW.Sid,S.Username,SW.Event,SW.Wait_Time,SW.State,SW.Seconds_In_Wait SEC_IN_WAIT 
from v$session S,v$session_wait SW where S.Username is not null and SW.Sid=S.Sid 
and SW.event not like '%SQL*Net%' order by SW.Wait_Time Desc; 

Oracle所有回滾段狀態(tài)的檢查：

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