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這篇文章主要介紹Oracle如何查看已被使用的open_cursors&session_cached_cursors,文中介紹的非常詳細(xì),具有一定的參考價(jià)值,感興趣的小伙伴們一定要看完!
查看當(dāng)前session已使用的最大open cursor數(shù) 和cached cursor數(shù):
SELECT 'session_cached_cursors' PARAMETER,
LPAD (VALUE, 5) VALUE,
DECODE (VALUE, 0, ' n/a', TO_CHAR (100 * USED / VALUE, '990') || '%')
USAGE
FROM (SELECT MAX (S.VALUE) USED
FROM V$STATNAME N, V$SESSTAT S
WHERE N.NAME = 'session cursor cache count'
AND S.STATISTIC# = N.STATISTIC#),
(SELECT VALUE
FROM V$PARAMETER
WHERE NAME = 'session_cached_cursors')
UNION ALL
SELECT 'open_cursors',
LPAD (VALUE, 5),
TO_CHAR (100 * USED / VALUE, '990') || '%'
FROM ( SELECT MAX (SUM (S.VALUE)) USED
FROM V$STATNAME N, V$SESSTAT S
WHERE N.NAME IN ('opened cursors current',
'session cursor cache count')
AND S.STATISTIC# = N.STATISTIC#
GROUP BY S.SID),
(SELECT VALUE
FROM V$PARAMETER
WHERE NAME = 'open_cursors');
注:如果查詢的session open cursor到達(dá)100% client就很可能報(bào)錯(cuò)ORA-01000
查看session open cursor的具體程式、open cursor數(shù)量:
SELECT a.inst_id,
a.sid,
a.USERNAME,
a.SCHEMANAME,
a.OSUSER,
a.machine,
a.TERMINAL,
a.LOGON_TIME,
a.PROGRAM,
a.STATUS,
b.name,
b.used
FROM gv$session a,
(SELECT n.inst_id,
sid,
n.name,
s.VALUE used
FROM gv$statname n, gv$sesstat s
WHERE n.name IN ('opened cursors current',
'session cursor cache count')
AND s.statistic# = n.statistic#
AND n.inst_id = s.inst_id) b
WHERE a.sid = b.sid
AND a.inst_id = b.inst_id
AND b.name <> 'session cursor cache count'
ORDER BY b.used DESC;
查看session open cursor的具體SQL(此方法是聯(lián)合v$open_cursor得出的結(jié)果,可能有不準(zhǔn)確。但session最多open_cursors的SQL一定是在運(yùn)行結(jié)果中)
SELECT distinct a.inst_id,
a.sid,
a.USERNAME,
a.SCHEMANAME,
a.OSUSER,
a.machine,
a.TERMINAL,
a.LOGON_TIME,
a.PROGRAM,
a.STATUS,
b.name,
b.used,c.sql_id
FROM gv$session a,
(SELECT n.inst_id, sid, n.name, s.VALUE used
FROM gv$statname n, gv$sesstat s
WHERE n.name IN
('opened cursors current',
'session cursor cache count')
AND s.statistic# = n.statistic# and n.inst_id=s.inst_id ) b,v$open_cursor c
WHERE a.sid = b.sid and a.inst_id = b.inst_id and a.sid=c.sid and c.CURSOR_TYPE in('OPEN','OPEN-PL/SQL','OPEN-RECURSIVE')
and b.name <> 'session cursor cache count'
order by b.used desc;
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