标签：union all use class man terminal blog pac highlight 最大
本文转自 http://blog.itpub.net/25583515/viewspace-2152997/
查看当前session已使用的最大open cursor数 和cached cursor数：
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：如果查询的session open cursor到达100% client就很可能报错ORA-01000
查看session open cursor的具体程式、open cursor数量：
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$sesstat s
WHERE n.name IN (‘opened cursors current‘,
‘session cursor cache count‘)
AND s.statistic# = n.statistic#
AND n.inst_id = s.inst_id) b
WHERE a.sid = b.sid
AND a.inst_id = b.inst_id
AND b.name <> ‘session cursor cache count‘
ORDER BY b.used DESC;
查看session open cursor的具体SQL(此方法是联合v$open_cursor得出的结果，可能有不准确。但session最多open_cursors的SQL一定是在运行结果中)
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;
Oracle查看 open_cursors 和 session_cached_cursors
标签：union all use class man terminal blog pac highlight 最大
原文地址：https://www.cnblogs.com/zylong-sys/p/12059605.html
