－－摘自本站“郭鎮技術BLOG”
查看錶空間的名稱及大小:
SQL> SELECT T.TABLESPACE_NAME, ROUND(SUM(BYTES/(1024 * 1024)), 0) TS_SIZE
FROM DBA_TABLESPACES T, DBA_DATA_FILES D
WHERE T.TABLESPACE_NAME = D.TABLESPACE_NAME
GROUP BY T.TABLESPACE_NAME;
查看錶空間物理文件的名稱及大小:
SQL> SELECT TABLESPACE_NAME,FILE_ID,FILE_NAME,ROUND(BYTES / (1024 * 1024), 0) TOTAL_SPACE
FROM DBA_DATA_FILES
ORDER BY TABLESPACE_NAME;
查看回滾段名稱及大小:
SQL> SELECT SEGMENT_NAME,
TABLESPACE_NAME,
R.STATUS,
(INITIAL_EXTENT / 1024) INITIALEXTENT,
(NEXT_EXTENT / 1024) NEXTEXTENT,
MAX_EXTENTS,
V.CUREXT CUREXTENT
FROM DBA_ROLLBACK_SEGS R, V$ROLLSTAT V
WHERE R.SEGMENT_ID = V.USN(+)
ORDER BY SEGMENT_NAME;
如何查看某個回滾段裏面，跑的什麼事物或者正在執行什麼sql語句:
SQL> SELECT D.SQL_TEXT, A.NAME
FROM V$ROLLNAME A, V$TRANSACTION B, V$SESSION C, V$SQLTEXT D
WHERE A.USN = B.XIDUSN
AND B.ADDR = C.TADDR
AND C.SQL_ADDRESS = D.ADDRESS
AND C.SQL_HASH_VALUE = D.HASH_VALUE
AND A.USN = 1;
(備註：你要看哪個，就把usn=?寫成幾就行了)
查看控制文件:
SQL> SELECT * FROM V$CONTROLFILE;
查看日誌文件:
SQL> COL MEMBER FORMAT A50
SQL>SELECT * FROM V$LOGFILE;
如何查看當前SQL*PLUS用戶的sid和serial#:
SQL>SELECT SID, SERIAL#, STATUS FROM V$SESSION WHERE AUDSID=USERENV('SESSIONID');
如何查看當前數據庫的字符集:
SQL>SELECT USERENV('LANGUAGE') FROM DUAL;
SQL>SELECT USERENV('LANG') FROM DUAL;
怎麼判斷當前正在使用何種SQL優化方式:
用EXPLAIN PLAN產生EXPLAIN PLAN¡檢查PLAN_TABLE中ID=0的POSITION列的值
SQL>SELECT DECODE(NVL(POSITION,-1),-1,'RBO',1,'CBO') FROM PLAN_TABLE WHERE ID=0;
如何查看系統當前最新的SCN號：
SQL>SELECT MAX(KTUXESCNW * POWER(2,32) + KTUXESCNB) FROM X$KTUXE;
在ORACLE中查找TRACE文件的腳本:
SQL>SELECT U_DUMP.VALUE || '/' || INSTANCE.VALUE || '_ORA_' ||
V$PROCESS.SPID || NVL2(V$PROCESS.TRACEID, '_' || V$PROCESS.TRACEID, NULL ) || '.TRC'"TRACE FILE" FROM V$PARAMETER U_DUMP CROSS JOIN V$PARAMETER INSTANCE CROSS JOIN V$PROCESS JOIN V$SESSION ON V$PROCESS.ADDR = V$SESSION.PADDR WHERE U_DUMP.NAME = 'USER_DUMP_DEST' AND
INSTANCE.NAME = 'INSTANCE_NAME' AND V$SESSION.AUDSID=SYS_CONTEXT('USERENV','SESSIONID');
SQL>SELECT D.VALUE || '/ORA_' || P.SPID || '.TRC' TRACE_FILE_NAME
FROM (SELECT P.SPID FROM SYS.V_$MYSTAT M,SYS.V_$SESSION S,
SYS.V_$PROCESS P WHERE M.STATISTIC# = 1 AND
S.SID = M.SID AND P.ADDR = S.PADDR) P,(SELECT VALUE FROM SYS.V_$PARAMETER WHERE NAME ='USER_DUMP_DEST') D;
如何查看客戶端登陸的IP地址:
SQL>SELECT SYS_CONTEXT('USERENV','IP_ADDRESS') FROM DUAL;
如何在生產數據庫中創建一個追蹤客戶端IP地址的觸發器：
SQL>CREATE OR REPLACE TRIGGER ON_LOGON_TRIGGER AFTER LOGON ON DATABASE
BEGIN
DBMS_APPLICATION_INFO.SET_CLIENT_INFO(SYS_CONTEXT('USERENV', 'IP_ADDRESS'));
END;
REM 記錄登陸信息的觸發器
CREATE OR REPLACE TRIGGER LOGON_HISTORY
AFTER LOGON ON DATABASE --WHEN (USER='WACOS') --ONLY FOR USER 'WACOS'
BEGIN
INSERT INTO SESSION_HISTORY SELECT USERNAME,SID,SERIAL#,AUDSID,OSUSER,ACTION,SYSDATE,NULL,SYS_CONTEXT('USERENV','IP_ADDRESS'),TERMINAL,MACHINE,PROGRAM FROM V$SESSION WHERE AUDSID = USERENV('SESSIONID');
END;
查詢當前日期:
SQL> SELECT TO_CHAR(SYSDATE,'YYYY-MM-DD,HH24:MI:SS') FROM DUAL;
查看所有表空間對應的數據文件名：
SQL>SELECT DISTINCT FILE_NAME,TABLESPACE_NAME,AUTOEXTENSIBLE FROM DBA_DATA_FILES;
查看錶空間的使用情況:
SQL>SELECT SUM(BYTES)/(1024*1024) AS FREE_SPACE,TABLESPACE_NAME
FROM DBA_FREE_SPACE GROUP BY TABLESPACE_NAME;
SQL>SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,
(B.BYTES*100)/A.BYTES "% USED",(C.BYTES*100)/A.BYTES "% FREE"
FROM SYS.SM$TS_AVAIL A,SYS.SM$TS_USED B,SYS.SM$TS_FREE C
WHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME AND A.TABLESPACE_NAME=C.TABLESPACE_NAME;
COLUMN TABLESPACE_NAME FORMAT A18;
COLUMN SUM_M FORMAT A12;
COLUMN USED_M FORMAT A12;
COLUMN FREE_M FORMAT A12;
COLUMN PTO_M FORMAT 9.99;
SELECT S.TABLESPACE_NAME,CEIL(SUM(S.BYTES/1024/1024))||'M' SUM_M,CEIL(SUM(S.USEDSPACE/1024/1024))||'M' USED_M,CEIL(SUM(S.FREESPACE/1024/1024))||'M' FREE_M, SUM(S.USEDSPACE)/SUM(S.BYTES) PTUSED FROM (SELECT B.FILE_ID,B.TABLESPACE_NAME,B.BYTES, (B.BYTES-SUM(NVL(A.BYTES,0))) USEDSPACE, SUM(NVL(A.BYTES,0)) FREESPACE,(SUM(NVL(A.BYTES,0))/(B.BYTES)) * 100 FREEPERCENTRATIO FROM SYS.DBA_FREE_SPACE A,SYS.DBA_DATA_FILES B WHERE A.FILE_ID(+)=B.FILE_ID GROUP BY B.FILE_ID,B.TABLESPACE_NAME,B.BYTES ORDER BY B.TABLESPACE_NAME) S GROUP BY S.TABLESPACE_NAME ORDER BY SUM(S.FREESPACE)/SUM(S.BYTES) DESC;
查看數據文件的hwm（可以resize的最小空間）和文件頭大小:
SELECT V1.FILE_NAME,V1.FILE_ID,NUM1 TOTLE_SPACE,NUM3 FREE_SPACE,
NUM1-NUM3 "USED_SPACE(HWM)",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(+);
數據文件大小及頭大小:
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(+);
(運行以上查詢，我們可以如下信息：
Totle_pace:該數據文件的總大小，字節爲單位
Free_space:該數據文件的剩於大小，字節爲單位
Used_space:該數據文件的已用空間，字節爲單位
Data_space:該數據文件中段數據佔用空間，也就是數據空間，字節爲單位
File_Head:該數據文件頭部佔用空間，字節爲單位)
數據庫各個表空間增長情況的檢查：
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"空閒空間(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;
查看各個表空間佔用磁盤情況:
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;
數據庫對象下一擴展與表空間的free擴展值的檢查：
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語句的獲取：
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
SELECT * FROM (SELECT PARSING_USER_ID
EXECUTIONS,SORTS,COMMAND_TYPE,DISK_READS,
SQL_TEXT FROM V$SQLAREA ORDER BY DISK_READS DESC)
WHERE ROWNUM<10 ;
等待時間最多的5個系統等待事件的獲取：
SQL>SELECT * FROM (SELECT * FROM V$SYSTEM_EVENT WHERE EVENT NOT LIKE 'SQL%' ORDER BY TOTAL_WAITS DESC) WHERE ROWNUM<=5;
查看當前等待事件的會話:
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$SESSION_WAIT WHERE EVENT NOT LIKE '%MESSAGE%' AND EVENT NOT LIKE 'SQL*NET%' AND EVENT NOT LIKE '%TIMER%' AND EVENT != 'WAKEUP TIME MANAGER';
找到與所連接的會話有關的當前等待事件：
SELECT SW.SID,S.USERNAME,SW.EVENT,SW.WAIT_TIME,SW.STATE,SW.SECONDS_IN_WAIT SEC_IN_WAIT
FROM V$SESSION S,V$SESSION_WAIT SW WHERE S.USERNAME IS NOT NULL AND SW.SID=S.SID
AND SW.EVENT NOT LIKE '%SQL*NET%' ORDER BY SW.WAIT_TIME DESC;
Oracle所有回滾段狀態的檢查：
SQL>SELECT SEGMENT_NAME,OWNER,TABLESPACE_NAME,INITIAL_EXTENT,NEXT_EXTENT,DBA_ROLLBACK_SEGS.STATUS FROM DBA_ROLLBACK_SEGS,V$DATAFILE WHERE FILE_ID=FILE#;
Oracle回滾段擴展信息的檢查:
COL NAME FORMAT A10
SET LINESIZE 140
SELECT SUBSTR(NAME,1,40) NAME,EXTENTS,RSSIZE,OPTSIZE,AVEACTIVE,EXTENDS,WRAPS,SHRINKS,HWMSIZE
FROM V$ROLLNAME RN,V$ROLLSTAT RS WHERE (RN.USN=RS.USN);
EXTENTS:回滾段中的盤區數量。
Rssize:以字節爲單位的回滾段的尺寸。
optsize：爲optimal參數設定的值。
Aveactive:從回滾段中刪除盤區時釋放的以字節爲單位的平均空間的大小。
Extends:系統爲回滾段增加的盤區的次數。
Shrinks:系統從回滾段中清除盤區（即回滾段收縮）的次數。回滾段每次清除盤區時，系統可能會從這個回滾段中消除一個或多個盤區。
Hwmsize:回滾段尺寸的上限，即回滾段曾經達到的最大尺寸。
(如果回滾段平均尺寸接近OPTIMAL的值，那麼說明OPTIMAL的值設置正確，如果回滾段動態增長次數或收縮次數很高，那麼需要提高OPTIMAL的值)
查看回滾段的使用情況，哪個用戶正在使用回滾段的資源:
SELECT S.USERNAME, U.NAME FROM V$TRANSACTION T,V$ROLLSTAT R,
V$ROLLNAME U,V$SESSION S WHERE S.TADDR=T.ADDR AND
T.XIDUSN=R.USN AND R.USN=U.USN ORDER BY S.USERNAME;
如何查看一下某個shared_server正在忙什麼:
SELECT A.USERNAME,A.MACHINE,A.PROGRAM,A.SID,
A.SERIAL#,A.STATUS,C.PIECE,C.SQL_TEXT
FROM V$SESSION A,V$PROCESS B,V$SQLTEXT C
WHERE B.SPID=13161 AND B.ADDR=A.PADDR
AND A.SQL_ADDRESS=C.ADDRESS(+) ORDER BY C.PIECE;
數據庫共享池性能檢查:
SELECT NAMESPACE,GETS,GETHITRATIO,PINS,PINHITRATIO,RELOADS,INVALIDATIONS FROM V$LIBRARYCACHE WHERE NAMESPACE IN('SQLAREA','TABLE/PROCEDURE','BODY','TRIGGER');
檢查數據重載比率:
SELECT SUM(RELOADS)/SUM(PINS)*100 "RELOAD RATIO" FROM
V$LIBRARYCACHE;
檢查數據字典的命中率:
SELECT 1-SUM(GETMISSES)/SUM(GETS) "DATA DICTIONARY HIT
RATIO" FROM V$ROWCACHE;
(對於library cache, gethitratio和pinhitratio應該大於90%,對於數據重載比率,reload ratio應該小於1%,對於數據字典的命中率,data dictionary hit ratio應該大於85%)
檢查共享內存的剩餘情況:
SELECT REQUEST_MISSES, REQUEST_FAILURES FROM V$SHARED_POOL_RESERVED;
(對於共享內存的剩餘情況, request_misses 和request_failures應該接近0)
數據高速緩衝區性能檢查:
SELECT 1-P.VALUE/(B.VALUE+C.VALUE) "DB BUFFER CACHE HIT RATIO" FROM V$SYSSTAT P,V$SYSSTAT B,V$SYSSTAT C WHERE P.NAME='PHYSICAL READS' AND B.NAME='DB BLOCK GETS' AND C.NAME='CONSISTENT GETS';
檢查buffer pool HIT_RATIO執行
SELECT NAME, (PHYSICAL_READS/(DB_BLOCK_GETS+CONSISTENT_GETS)) "MISS_HIT_RATIO" FROM V$BUFFER_POOL_STATISTICS WHERE (DB_BLOCK_GETS+ CONSISTENT_GETS)> 0;
(正常時db buffer cache hit ratio 應該大於90%,正常時buffer pool MISS_HIT_RATIO 應該小於10%)
數據庫回滾段性能檢查:
檢查Ratio執行
SELECT SUM(WAITS)* 100 /SUM(GETS) "RATIO", SUM(WAITS) "WAITS", SUM(GETS) "GETS" FROM V$ROLLSTAT;
檢查count/value執行:
SELECT CLASS,COUNT FROM V$WAITSTAT WHERE CLASS LIKE '%UNDO%';
SELECT VALUE FROM V$SYSSTAT WHERE NAME='CONSISTENT GETS';
(兩者的value值相除)
檢查average_wait執行:
SELECT EVENT,TOTAL_WAITS,TIME_WAITED,AVERAGE_WAIT FROM V$SYSTEM_EVENT WHERE EVENT LIKE '%UNDO%';
檢查RBS header get ratio執行:
SELECT N.NAME,S.USN,S.WRAPS, DECODE(S.WAITS,0,1,1- S.WAITS/S.GETS)"RBS HEADER GET RATIO" FROM V$ROLLSTAT S,V$ROLLNAME N WHERE S.USN=N.USN;
(正常時Ratio應該小於1%, count/value應該小於0.01%,average_wait最好爲0，該值越小越好,RBS header get ratio應該大於95%)
殺會話的腳本:
SELECT A.SID,B.SPID,A.SERIAL#,A.LOCKWAIT,A.USERNAME,A.OSUSER,A.LOGON_TIME,A.LAST_CALL_ET/3600 LAST_HOUR,A.STATUS, 'ORAKILL '||SID||' '||SPID HOST_COMMAND,'ALTER SYSTEM KILL SESSION '''||A.SID||','||A.SERIAL#||'''' SQL_COMMAND FROM V$SESSION A,V$PROCESS B WHERE A.PADDR=B.ADDR AND SID>6;
查看排序段的性能:
SQL>SELECT NAME, VALUE FROM V$SYSSTAT WHERE NAME IN ('SORTS (MEMORY)', 'SORTS (DISK)');
7、查看數據庫庫對象:
SELECT OWNER, OBJECT_TYPE, STATUS, COUNT(*) COUNT# FROM ALL_OBJECTS GROUP BY OWNER, OBJECT_TYPE, STATUS;
8、查看數據庫的版本:
SELECT * FROM V$VERSION;
9、查看數據庫的創建日期和歸檔方式:
SELECT CREATED, LOG_MODE, LOG_MODE FROM V$DATABASE;
10、捕捉運行很久的SQL:
COLUMN USERNAME FORMAT A12
COLUMN OPNAME FORMAT A16
COLUMN PROGRESS FORMAT A8
SELECT USERNAME,SID,OPNAME,ROUND(SOFAR*100 / TOTALWORK,0) || '%' AS PROGRESS,TIME_REMAINING,SQL_TEXT FROM V$SESSION_LONGOPS , V$SQL WHERE TIME_REMAINING <> 0 AND SQL_ADDRESS=ADDRESS AND SQL_HASH_VALUE = HASH_VALUE;
11、查看數據表的參數信息:
SELECT PARTITION_NAME, HIGH_VALUE, HIGH_VALUE_LENGTH, TABLESPACE_NAME,PCT_FREE, PCT_USED, INI_TRANS, MAX_TRANS, INITIAL_EXTENT,NEXT_EXTENT, MIN_EXTENT, MAX_EXTENT, PCT_INCREASE, FREELISTS,FREELIST_GROUPS, LOGGING, BUFFER_POOL, NUM_ROWS, BLOCKS,EMPTY_BLOCKS, AVG_SPACE, CHAIN_CNT, AVG_ROW_LEN, SAMPLE_SIZE,LAST_ANALYZED FROM DBA_TAB_PARTITIONS
--WHERE TABLE_NAME = :TNAME AND TABLE_OWNER = :TOWNER
ORDER BY PARTITION_POSITION;
12、查看還沒提交的事務:
SELECT * FROM V$LOCKED_OBJECT;
SELECT * FROM V$TRANSACTION;
13、查找object爲哪些進程所用:
SELECT P.SPID,S.SID,S.SERIAL# SERIAL_NUM,S.USERNAME USER_NAME,
A.TYPE OBJECT_TYPE,S.OSUSER OS_USER_NAME,A.OWNER,A.OBJECT OBJECT_NAME,DECODE(SIGN(48 - COMMAND),1,
TO_CHAR(COMMAND), 'ACTION CODE #' || TO_CHAR(COMMAND) ) ACTION,
P.PROGRAM ORACLE_PROCESS,S.TERMINAL TERMINAL,S.PROGRAM PROGRAM,S.STATUS SESSION_STATUS FROM V$SESSION S, V$ACCESS A, V$PROCESS P WHERE S.PADDR = P.ADDR AND S.TYPE = 'USER' AND A.SID = S.SID AND A.OBJECT='SUBSCRIBER_ATTR'ORDER BY S.USERNAME, S.OSUSER;
14、查看回滾段:
SQL>COL NAME FORMAT A10
SQL>SET LINESIZE 100
SQL>SELECT ROWNUM, SYS.DBA_ROLLBACK_SEGS.SEGMENT_NAME NAME, V$ROLLSTAT.EXTENTS EXTENTS, V$ROLLSTAT.RSSIZE SIZE_IN_BYTES, V$ROLLSTAT.XACTS XACTS, V$ROLLSTAT.GETS GETS, V$ROLLSTAT.WAITS WAITS, V$ROLLSTAT.WRITES WRITES, SYS.DBA_ROLLBACK_SEGS.STATUS STATUS FROM V$ROLLSTAT, SYS.DBA_ROLLBACK_SEGS, V$ROLLNAME WHERE V$ROLLNAME.NAME(+) = SYS.DBA_ROLLBACK_SEGS.SEGMENT_NAME AND V$ROLLSTAT.USN (+) = V$ROLLNAME.USN ORDER BY ROWNUM;
15、耗資源的進程(top session):
SELECT S.SCHEMANAME SCHEMA_NAME,DECODE(SIGN(48 - COMMAND), 1, TO_CHAR(COMMAND), 'ACTION CODE #' || TO_CHAR(COMMAND) ) ACTION,STATUS SESSION_STATUS,S.OSUSER OS_USER_NAME,S.SID,P.SPID,S.SERIAL# SERIAL_NUM,NVL(S.USERNAME,'[ORACLE PROCESS]') USER_NAME,S.TERMINAL TERMINAL,S.PROGRAM PROGRAM,ST.VALUE CRITERIA_VALUE FROM V$SESSTAT ST,V$SESSION S,V$PROCESS P WHERE ST.SID = S.SID AND ST.STATISTIC# = TO_NUMBER('38') AND ('ALL'='ALL' OR S.STATUS ='ALL') AND P.ADDR=S.PADDR ORDER BY ST.VALUE DESC,P.SPID ASC,S.USERNAME ASC,S.OSUSER ASC;
根據PID查找相應的語句:
SELECT A.USERNAME, A.MACHINE,A.PROGRAM,A.SID,A.SERIAL#,A.STATUS,C.PIECE,C.SQL_TEXT FROM V$SESSION A,V$PROCESS B,V$SQLTEXT C WHERE B.SPID=SPID AND B.ADDR=A.PADDR AND A.SQL_ADDRESS=C.ADDRESS(+) ORDER BY C.PIECE;
根據SID找ORACLE的某個進程:
SQL> SELECT PRO.SPID FROM V$SESSION SES,V$PROCESS PRO WHERE SES.SID=21 AND SES.PADDR=PRO.ADDR;
監控當前數據庫誰在運行什麼SQL語句:
SQL>SELECT OSUSER, USERNAME, SQL_TEXT FROM V$SESSION A, V$SQLTEXT B
WHERE A.SQL_ADDRESS =B.ADDRESS ORDER BY ADDRESS, PIECE;
如何查看數據庫中某用戶，正在運行什麼SQL語句
SQL>SELECT SQL_TEXT FROM V$SQLTEXT T, V$SESSION S WHERE T.ADDRESS=S.SQL_ADDRESS AND T.HASH_VALUE=S.SQL_HASH_VALUE AND S.MACHINE='XXXXX' OR USERNAME='WACOS';
如何查出前臺正在發出的sql語句:
SQL> SELECT USER_NAME,SQL_TEXT FROM V$OPEN_CURSOR WHERE SID IN(SELECT SID FROM (SELECT SID,SERIAL# FROM V$SESSION WHERE STATUS='ACTIVE'));
查詢當前所執行的SQL語句：
SQL> SELECT PROGRAM ,SQL_ADDRESS FROM V$SESSION WHERE PADDR IN (SELECT ADDR FROM V$PROCESS WHERE SPID=3556);
PROGRAM SQL_ADDRESS
------------------------------------------------ ----------------
SQLPLUS@CTC20 (TNS V1-V3) 000000038FCB1A90
SQL> SELECT SQL_TEXT FROM V$SQLAREA WHERE ADDRESS='000000038FCB1A90';
找出消耗CPU最高的進程對應的SQL語句：
SET LINE 240
SET VERIFY OFF
COLUMN SID FORMAT 999
COLUMN PID FORMAT 999
COLUMN S_# FORMAT 999
COLUMN USERNAME FORMAT A9 HEADING "ORA USER"
COLUMN PROGRAM FORMAT A29
COLUMN SQL FORMAT A60
COLUMN OSNAME FORMAT A9 HEADING "OS USER"
SELECT P.PID PID,S.SID SID,P.SPID SPID,S.USERNAME USERNAME,S.OSUSER OSNAME,P.SERIAL# S_#,P.TERMINAL,P.PROGRAM PROGRAM,P.BACKGROUND,S.STATUS,RTRIM(SUBSTR(A.SQL_TEXT, 1, 80)) SQLFROM V$PROCESS P, V$SESSION S,V$SQLAREA A WHERE P.ADDR = S.PADDR AND S.SQL_ADDRESS = A.ADDRESS (+) AND P.SPID LIKE '%&1%';
ENTER VALUE FOR 1: PID¡（這裏輸入佔用CPU最高的進程對應的PID）
SET TERMOUT OFF
SPOOL MAXCPU.TXT
SELECT '++'||S.USERNAME USERNAME,RTRIM(REPLACE(A.SQL_TEXT,CHR(10),''))||';'FROM V$PROCESS P, V$SESSION S,V$SQLAREA A WHERE P.ADDR = S.PADDR AND S.SQL_ADDRESS = A.ADDRESS (+) AND P.SPID LIKE '%&&1%';
Enter value for 1: PID（這裏輸入佔用CPU最高的進程對應的PID）
spool off(這句放在最後執行)
CPU用率最高的2條SQL語句的獲取
執行：top，通過top獲得CPU佔用率最高的進程的pid。
SQL>SELECT SQL_TEXT,SPID,V$SESSION.PROGRAM,PROCESS FROM V$SQLAREA,V$SESSION,V$PROCESS WHERE V$SQLAREA.ADDRESS=V$SESSION.SQL_ADDRESS AND V$SQLAREA.HASH_VALUE=V$SESSION.SQL_HASH_VALUE AND V$SESSION.PADDR=V$PROCESS.ADDR AND V$PROCESS.SPID IN (PID);
COL MACHINE FORMAT A30
COL PROGRAM FORMAT A40
SET LINE 200
SQL>SELECT SID,SERIAL# ,USERNAME,OSUSER,MACHINE,PROGRAM,PROCESS,TO_CHAR(LOGON_TIME,'YYYY/MM/DD HH24:MI:SS') FROM V$SESSION WHERE PADDR IN(SELECT ADDR FROM V$PROCESS WHERE SPID IN([$SPID]));
SELECT SQL_TEXT FROM V$SQLTEXT_WITH_NEWLINES
WHERE HASH_VALUE=(SELECT SQL_HASH_VALUE FROM V$SESSION WHERE SID=&SID)
ORDER BY PIECE;
16、查看鎖（lock）情況:
SQL>SELECT /*+ RULE */
LS.OSUSER OS_USER_NAME,
LS.USERNAME USER_NAME,
DECODE(LS.TYPE,
'RW','ROW WAIT ENQUEUE LOCK',
'TM','DML ENQUEUE LOCK',
'TX','TRANSACTION ENQUEUE LOCK',
'UL','USER SUPPLIED LOCK') LOCK_TYPE,
O.OBJECT_NAME OBJECT,
DECODE(LS.LMODE,
1,NULL,
2,'ROW SHARE',
3,'ROW EXCLUSIVE',
4,'SHARE',
5,'SHARE ROW EXCLUSIVE',
6,'EXCLUSIVE',
NULL) LOCK_MODE,
O.OWNER,
LS.SID,
LS.SERIAL# SERIAL_NUM,
LS.ID1,
LS.ID2
FROM SYS.DBA_OBJECTS O,
(SELECT S.OSUSER,
S.USERNAME,
L.TYPE,
L.LMODE,
S.SID,
S.SERIAL#,
L.ID1,
L.ID2
FROM V$SESSION S, V$LOCK L
WHERE S.SID = L.SID) LS
WHERE O.OBJECT_ID = LS.ID1
AND O.OWNER <> 'SYS'
ORDER BY O.OWNER, O.OBJECT_NAME;
SQL>SELECT SYS.V_$SESSION.OSUSER,
SYS.V_$SESSION.MACHINE,
V$LOCK.SID,
SYS.V_$SESSION.SERIAL#,
DECODE(V$LOCK.TYPE,
'MR','MEDIA RECOVERY',
'RT','REDO THREAD',
'UN','USER NAME',
'TX','TRANSACTION',
'TM','DML',
'UL','PL/SQL USER LOCK',
'DX','DISTRIBUTED XACTION',
'CF','CONTROL FILE',
'IS','INSTANCE STATE',
'FS','FILE SET',
'IR','INSTANCE RECOVERY',
'ST','DISK SPACE TRANSACTION',
'TS','TEMP SEGMENT',
'IV','LIBRARY CACHE INVALIDA-TION',
'LS','LOG START OR SWITCH',
'RW','ROW WAIT',
'SQ','SEQUENCE NUMBER',
'TE','EXTEND TABLE',
'TT','TEMP TABLE',
'UNKNOWN') LOCKTYPE,
RTRIM(OBJECT_TYPE) || ' ' || RTRIM(OWNER) || '.' || OBJECT_NAME OBJECT_NAME,
DECODE(LMODE,
0,'NONE',
1,'NULL',
2,'ROW-S',
3,'ROW-X',
4,'SHARE',
5,'S/ROW-X',
6,'EXCLUSIVE',
'UNKNOWN') LOCKMODE,
DECODE(REQUEST,
0,'NONE',
1,'NULL',
2,'ROW-S',
3,'ROW-X',
4,'SHARE',
5,'S/ROW-X',
6,'EXCLUSIVE',
'UNKNOWN') REQUESTMODE,
CTIME,
BLOCK B
FROM V$LOCK, ALL_OBJECTS, SYS.V_$SESSION
WHERE V$LOCK.SID > 6
AND SYS.V_$SESSION.SID = V$LOCK.SID
AND V$LOCK.ID1 = ALL_OBJECTS.OBJECT_ID;
以DBA角色, 查看當前數據庫裏鎖的情況可以用如下SQL語句：
COL OWNER FOR A12
COL OBJECT_NAME FOR A16
SELECT B.OWNER,B.OBJECT_NAME,L.SESSION_ID,L.LOCKED_MODE
FROM V$LOCKED_OBJECT L, DBA_OBJECTS B
WHERE B.OBJECT_ID=L.OBJECT_ID;
SQL>SELECT T2.USERNAME,T2.SID,T2.SERIAL#,T2.LOGON_TIME FROM V$LOCKED_OBJECT T1,V$SESSION T2 WHERE T1.SESSION_ID=T2.SID ORDER BY T2.LOGON_TIME;
SQL>SELECT SQL_ADDRESS FROM V$SESSION WHERE SID=;
SQL>SELECT * FROM V$SQLTEXT WHERE ADDRESS=;
SQL>SELECT COMMAND_TYPE,PIECE,SQL_TEXT FROM V$SQLTEXT WHERE ADDRESS=(SELECT SQL_ADDRESS FROM V$SESSION A WHERE SID=18);
SQL>SELECT OBJECT_ID FROM V$LOCKED_OBJECT;
SQL>SELECT OBJECT_NAME,OBJECT_TYPE FROM DBA_OBJECTS WHERE OBJECT_ID='';
如果有長期出現的一列，可能是沒有釋放的鎖。我們可以用下面SQL語句殺掉長期沒有釋放非正常的鎖： SQL>ALTER SYSTEM KILL SESSION 'SID,SERIAL#';
17、查看等待（wait）情況:
SQL>SELECT V$WAITSTAT.CLASS,V$WAITSTAT.COUNT COUNT, SUM(V$SYSSTAT.VALUE) SUM_VALUE FROM V$WAITSTAT,V$SYSSTAT WHERE V$SYSSTAT.NAME IN('DB BLOCK GETS','CONSISTENT GETS') GROUP BY V$WAITSTAT.CLASS,V$WAITSTAT.COUNT;
18、查看sga情況:
SQL>SELECT NAME, BYTES FROM SYS.V_$SGASTAT ORDER BY NAME ASC;
19、查看catched object:
SQL>SELECT OWNER,NAME,DB_LINK,NAMESPACE,TYPE,SHARABLE_MEM,LOADS, EXECUTIONS,LOCKS,PINS,KEPT FROM V$DB_OBJECT_CACHE;
20、查看V$SQLAREA:
SQL>SELECT SQL_TEXT,SHARABLE_MEM,PERSISTENT_MEM,RUNTIME_MEM,SORTS,
VERSION_COUNT,LOADED_VERSIONS,OPEN_VERSIONS,USERS_OPENING,EXECUTIONS,
USERS_EXECUTING,LOADS,FIRST_LOAD_TIME,INVALIDATIONS,PARSE_CALLS,
DISK_READS,BUFFER_GETS,ROWS_PROCESSED FROM V$SQLAREA;
21、查看object分類數量:
SELECT DECODE(O.TYPE#,1,'INDEX',2,'TABLE',3,'CLUSTER',4,'VIEW',5,'SYNONYM',6, 'SEQUENCE','OTHER') OBJECT_TYPE , COUNT(*) QUANTITY FROM SYS.OBJ$ O WHERE O.TYPE# > 1 GROUP BY DECODE(O.TYPE#,1,'INDEX',2,'TABLE',3,'CLUSTER' ,4,'VIEW',5,'SYNONYM',6,'SEQUENCE','OTHER') UNION SELECT 'COLUMN', COUNT(*) FROM SYS.COL$ UNION SELECT 'DB LINK' , COUNT(*) FROM ALL_OBJECTS;
22、有關connection的相關信息:
1）查看有哪些用戶連接
SELECT S.OSUSER OS_USER_NAME,DECODE(SIGN(48 - COMMAND),1,TO_CHAR(COMMAND),
'ACTION CODE #' || TO_CHAR(COMMAND))ACTION,P.PROGRAM ORACLE_PROCESS, STATUS SESSION_STATUS,S.TERMINAL TERMINAL,S.PROGRAM PROGRAM, S.USERNAME USER_NAME,S.FIXED_TABLE_SEQUENCE ACTIVITY_METER,''QUERY,0 MEMORY,0 MAX_MEMORY,0 CPU_USAGE,S.SID,S.SERIAL# SERIAL_NUM FROM V$SESSION S,V$PROCESS P WHERE S.PADDR=P.ADDR AND S.TYPE = 'USER' ORDER BY S.USERNAME, S.OSUSER;
2）根據v.sid查看對應連接的資源佔用等情況
SELECT N.NAME,V.VALUE,N.CLASS,N.STATISTIC# FROM V$STATNAME N,V$SESSTAT V WHERE V.SID=18 AND V.STATISTIC# = N.STATISTIC# ORDER BY N.CLASS, N.STATISTIC#;
3）根據sid查看對應連接正在運行的sql
SELECT /*+ PUSH_SUBQ */ COMMAND_TYPE,SQL_TEXT,SHARABLE_MEM, PERSISTENT_MEM,RUNTIME_MEM,SORTS,VERSION_COUNT,LOADED_VERSIONS,OPEN_VERSIONS,USERS_OPENING,EXECUTIONS, USERS_EXECUTING,LOADS,FIRST_LOAD_TIME,INVALIDATIONS,PARSE_CALLS,DISK_READS,BUFFER_GETS,ROWS_PROCESSED,SYSDATE START_TIME,SYSDATE FINISH_TIME,'>'|| ADDRESS SQL_ADDRESS, 'N' STATUS FROM V$SQLAREA WHERE ADDRESS = (SELECT SQL_ADDRESS FROM V$SESSION WHERE SID=8);
根據pid查看sql語句:
SELECT SQL_TEXT FROM V$SQL WHERE ADDRESS IN (SELECT SQL_ADDRESS FROM V$SESSION WHERE SID IN (SELECT SID FROM V$SESSION WHERE PADDR IN (SELECT ADDR FROM V$PROCESS WHERE SPID=&PID)));
