前言：
当前大家对“oracle查看cpu消耗”都比较关注，兄弟们都需要学习一些“oracle查看cpu消耗”的相关内容。那么小编在网络上网罗了一些有关“oracle查看cpu消耗””的相关知识，希望我们能喜欢，各位老铁们快快来学习一下吧！在Oracle中，如何查找最近1分钟内，最消耗CPU的SQL语句及会话信息？
答案如下所示：
可以根据V$ACTIVE_SESSION_HISTORY视图来获取，如下所示：
① 查找最近一分钟内，最消耗CPU的SQL语句：
SELECT ASH.INST_ID,
ASH.SQL_ID,
(SELECT VS.SQL_TEXT
FROM GV$SQLAREA VS
WHERE VS.SQL_ID = ASH.SQL_ID
AND ASH.INST_ID = VS.INST_ID) SQL_TEXT,
ASH.SQL_CHILD_NUMBER,
ASH.SQL_OPNAME,
ASH.SESSION_INFO,
COUNTS,
PCTLOAD * 100 || '%' PCTLOAD
FROM (SELECT ASH.INST_ID,
ASH.SQL_ID,
ASH.SQL_CHILD_NUMBER,
ASH.SQL_OPNAME,
(ASH.MODULE || '--' || ASH.ACTION || '--' || ASH.PROGRAM || '--' ||
ASH.MACHINE || '--' || ASH.CLIENT_ID || '--' ||
ASH.SESSION_TYPE) SESSION_INFO,
COUNT(*) COUNTS,
ROUND(COUNT(*) / SUM(COUNT(*)) OVER(), 2) PCTLOAD,
DENSE_RANK() OVER(ORDER BY COUNT(*) DESC) RANK_ORDER
FROM GV$ACTIVE_SESSION_HISTORY ASH
WHERE ASH.SESSION_TYPE <> 'BACKGROUND'
AND ASH.SESSION_STATE = 'ON CPU'
AND SAMPLE_TIME > SYSDATE - 1 / (24 * 60)
GROUP BY ASH.INST_ID,
ASH.SQL_ID,
ASH.SQL_CHILD_NUMBER,
ASH.SQL_OPNAME,
(ASH.MODULE || '--' || ASH.ACTION || '--' || ASH.PROGRAM || '--' ||
ASH.MACHINE || '--' || ASH.CLIENT_ID || '--' ||
ASH.SESSION_TYPE)) ASH
WHERE RANK_ORDER <= 10
ORDER BY COUNTS DESC;
② 查找最近一分钟内，最消耗CPU的会话：
SELECT SESSION_ID,
COUNT(*)
FROM V$ACTIVE_SESSION_HISTORY V
WHERE V.SESSION_STATE = 'ON CPU'
AND V.SAMPLE_TIME > SYSDATE - 10/ (24 * 60)
GROUP BY SESSION_ID
ORDER BY COUNT(*) DESC;
③ 查找最近一分钟内，最消耗I/O的SQL语句：
SELECT ASH.INST_ID,
ASH.SQL_ID,
(SELECT VS.SQL_TEXT
FROM GV$SQLAREA VS
WHERE VS.SQL_ID = ASH.SQL_ID
AND ASH.INST_ID = VS.INST_ID) SQL_TEXT,
ASH.SQL_CHILD_NUMBER,
ASH.SQL_OPNAME,
ASH.SESSION_INFO,
COUNTS,
PCTLOAD * 100 || '%' PCTLOAD
FROM (SELECT ASH.INST_ID,
ASH.SQL_ID,
ASH.SQL_CHILD_NUMBER,
ASH.SQL_OPNAME,
(ASH.MODULE || '--' || ASH.ACTION || '--' || ASH.PROGRAM || '--' ||
ASH.MACHINE || '--' || ASH.CLIENT_ID || '--' ||
ASH.SESSION_TYPE) SESSION_INFO,
COUNT(*) COUNTS,
ROUND(COUNT(*) / SUM(COUNT(*)) OVER(), 2) PCTLOAD,
DENSE_RANK() OVER(ORDER BY COUNT(*) DESC) RANK_ORDER
FROM GV$ACTIVE_SESSION_HISTORY ASH
WHERE ASH.SESSION_TYPE <> 'BACKGROUND'
AND ASH.SESSION_STATE = 'WAITING'
AND ASH.SAMPLE_TIME > SYSDATE - 1 / (24 * 60)
AND ASH.WAIT_CLASS = 'USER I/O'
GROUP BY ASH.INST_ID,
ASH.SQL_ID,
ASH.SQL_CHILD_NUMBER,
ASH.SQL_OPNAME,
(ASH.MODULE || '--' || ASH.ACTION || '--' || ASH.PROGRAM || '--' ||
ASH.MACHINE || '--' || ASH.CLIENT_ID || '--' ||
ASH.SESSION_TYPE)) ASH
WHERE RANK_ORDER <= 10
ORDER BY COUNTS DESC;
④ 查找最近一分钟内，最消耗资源的SQL语句：
SELECT ASH.INST_ID,
ASH.SQL_ID,
(SELECT VS.SQL_TEXT
FROM GV$SQLAREA VS
WHERE VS.SQL_ID = ASH.SQL_ID
AND ASH.INST_ID = VS.INST_ID) SQL_TEXT,
ASH.SQL_CHILD_NUMBER,
ASH.SQL_OPNAME,
ASH.SESSION_INFO,
COUNTS,
PCTLOAD * 100 || '%' PCTLOAD
FROM (SELECT ASH.INST_ID,
ASH.SQL_ID,
ASH.SQL_CHILD_NUMBER,
ASH.SQL_OPNAME,
(ASH.MODULE || '--' || ASH.ACTION || '--' || ASH.PROGRAM || '--' ||
ASH.MACHINE || '--' || ASH.CLIENT_ID || '--' ||
ASH.SESSION_TYPE) SESSION_INFO,
COUNT(*) COUNTS,
ROUND(COUNT(*) / SUM(COUNT(*)) OVER(), 2) PCTLOAD,
DENSE_RANK() OVER(ORDER BY COUNT(*) DESC) RANK_ORDER
FROM GV$ACTIVE_SESSION_HISTORY ASH
WHERE ASH.SESSION_TYPE <> 'BACKGROUND'
AND ASH.SESSION_STATE = 'WAITING'
AND ASH.SAMPLE_TIME > SYSDATE - 1 / (24 * 60)
AND ASH.WAIT_CLASS = 'USER I/O'
GROUP BY ASH.INST_ID,
ASH.SQL_ID,
ASH.SQL_CHILD_NUMBER,
ASH.SQL_OPNAME,
(ASH.MODULE || '--' || ASH.ACTION || '--' || ASH.PROGRAM || '--' ||
ASH.MACHINE || '--' || ASH.CLIENT_ID || '--' ||
ASH.SESSION_TYPE)) ASH
WHERE RANK_ORDER <= 10
ORDER BY COUNTS DESC;
⑤ 查找最近一分钟内，最消耗资源的会话：
SELECT ASH.SESSION_ID,
ASH.SESSION_SERIAL#,
ASH.USER_ID,
ASH.PROGRAM,
SUM(DECODE(ASH.SESSION_STATE, 'ON CPU', 1, 0)) "CPU",
SUM(DECODE(ASH.SESSION_STATE, 'WAITING', 1, 0)) -
SUM(DECODE(ASH.SESSION_STATE,
'WAITING',
DECODE(ASH.WAIT_CLASS, 'USER I/O', 1, 0),
0)) "WAITING",
SUM(DECODE(ASH.SESSION_STATE,
'WAITING',
DECODE(ASH.WAIT_CLASS, 'USER I/O', 1, 0),
0)) "IO",
SUM(DECODE(ASH.SESSION_STATE, 'ON CPU', 1, 1)) "TOTAL"
FROM V$ACTIVE_SESSION_HISTORY ASH
WHERE ASH.SAMPLE_TIME > SYSDATE - 1 / (24 * 60)
GROUP BY ASH.SESSION_ID, ASH.USER_ID, ASH.SESSION_SERIAL#, ASH.PROGRAM
ORDER BY SUM(DECODE(ASH.SESSION_STATE, 'ON CPU', 1, 1));
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