查詢方法：1、用“select count(*) from v$open_cursor”；2、用“SELECT A.USER_NAME,COUNT(*) FROM V$OPEN_CURSOR A GROUP BY A.USER_NAME”。

本教程操作環境：Windows7系統、Oracle 11g版、Dell G3電腦。

1、查看系統游標數(最大游標數)

select value from v$parameter where name = 'open_cursors';show parameter open_cursors;

2、查看當前打開的游標數目

select count(*) from v$open_cursor;

3、查看游標使用情況

select o.sid, osuser, machine,o.sql_id,o.sql_text,o.cursor_type, count(*) num_curs from v$open_cursor o, v$session s where user_name = 'GLOGOWNER' and o.sid = s.sid group by o.sid, osuser, machine,o.sql_id,o.sql_text,o.cursor_type order by num_curs desc;

4、修改Oracle最大游標數

根據游標占用情況分析訪問數據庫的程序在資源釋放上是否正常,如果程序釋放資源沒有問題，則加大游標數。

alter system set open_cursors=2000 scope=both;

5、各用戶的打開游標總數

SELECT A.USER_NAME, COUNT(*) FROM V$OPEN_CURSOR A GROUP BY A.USER_NAME;

6、查找數據庫各用戶各個終端的緩存游標數

SELECT AA.USERNAME, AA.MACHINE, SUM(AA.VALUE) FROM (SELECT A.VALUE, S.MACHINE, S.USERNAME FROM V$SESSTAT A, V$STATNAME B, V$SESSION S WHERE A.STATISTIC# = B.STATISTIC# AND S.SID = A.SID AND B.NAME = 'session cursor cache count') AA GROUP BY AA.USERNAME, AA.MACHINE ORDER BY AA.USERNAME, AA.MACHINE;

7、查找數據庫各用戶各個終端的打開游標數

SELECT AA.USERNAME, AA.MACHINE, SUM(AA.VALUE) FROM (SELECT A.VALUE, S.MACHINE, S.USERNAME FROM V$SESSTAT A, V$STATNAME B, V$SESSION S WHERE A.STATISTIC# = B.STATISTIC# AND S.SID = A.SID AND B.NAME = 'opened cursors current') AA GROUP BY AA.USERNAME, AA.MACHINE ORDER BY AA.USERNAME, AA.MACHINE;

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