ORA-01000 解决方法

今天我也遇见了ORA-01000这个问题，有个概念一定要记牢，就是show parameter open_cursors这个参数是指每个session，包含递归的cursor能打开的最大游标数，按照session 查看打开游标数，跟open_cursor对比

1. SELECT SID, COUNT(*) FROM V$OPEN_CURSOR GROUP BY SID ORDER BY 2 DESC
   
   按用户查看打开游标的情况

1. SELECT S.USERNAME, O.SID, O.CURSOR_CNT
   
2.   FROM (SELECT SID, COUNT(*) AS CURSOR_CNT FROM V$OPEN_CURSOR GROUP BY SID) O,
3.        V$SESSION S
4.  WHERE S.SID = O.SID
5.    AND S.USERNAME IS NOT NULL ORDER BY 1

按照SQL id打开游标排序

1. SELECT O.*, S.USERNAME
   
2.   FROM (SELECT SQL_ID,
3.                SQL_TEXT,
4.                SID,
5.                COUNT(1) OVER(PARTITION BY SQL_ID) AS CURSOR_CNT
6.           FROM V$OPEN_CURSOR) O,
7.        V$SESSION S
8.  WHERE O.SID = S.SID
9.    AND USERNAME IS NOT NULL ORDER BY 4 DESC

使用比例

1. SELECT 'session_cached_cursors' PARAMETER,
   
2.        LPAD(VALUE, 5) VALUE,
3.        DECODE(VALUE, 0, ' n/a', TO_CHAR(100 * USED / VALUE, '990') || '%') USAGE
4.   FROM (SELECT MAX(S.VALUE) USED
5.           FROM V$STATNAME N, V$SESSTAT S
6.          WHERE N.NAME = 'session cursor cache count'
7.            AND S.STATISTIC# = N.STATISTIC#),
8.        (SELECT VALUE FROM V$PARAMETER WHERE NAME = 'session_cached_cursors')
9. UNION ALL
10. SELECT 'open_cursors',
11.        LPAD(VALUE, 5),
12.        TO_CHAR(100 * USED / VALUE, '990') || '%'
13.   FROM (SELECT MAX(SUM(S.VALUE)) USED
14.           FROM V$STATNAME N, V$SESSTAT S
15.          WHERE N.NAME IN
16.                ('opened cursors current', 'session cursor cache count')
17.            AND S.STATISTIC# = N.STATISTIC#
18.          GROUP BY S.SID),
19.        (SELECT VALUE FROM V$PARAMETER WHERE NAME = 'open_cursors')

session_cached_cursor是与ORA-01000没有什么直接关系，出现ORA-01000你就别想了