max open cursors exceeded

From: elain he <elainhe_at_hotmail.com>
Date: Mon, 20 Oct 2003 08:39:25 -0800
Message-ID: <F001.005D3C12.20031020083925@fatcity.com>

Hi,
I'm trying to troubleshoot ora-1000 (max cursors exceeded) for an application. When I ran the following query on the SID(192),

select hash_value ,count(*)
from v$open_cursor
where sid=192
group by hash_Value
having count(*) >1;

HASH_VALUE COUNT(*)
---------- ----------

670480087          5
563605149          3
1016653255         10
2005317811          3

hash value: 1016653255 is a simple SQL statement- select sysdate from dual;

the results returned hash_values with counts as high as 10. I understand that even if cursors are closed, they are still cached in server memory and will still show up in v$open_cursor. I do not understand why there are duplicate sql statements in v$open_cursor for the SID. Does that mean that Oracle is not reusing the cursor for whatever reasons and thus opens new ones? If that is true, what could be the reasons that 'select sysdate from dual' could not be reused?

Thanks.

elain

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Author: elain he
  INET: elainhe_at_hotmail.com

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