open_cursors is not a sum for the total number of users, but rather the 
maximum number of cursors an individual user can have open at any one time

v$open_cursor

SQL> desc v$open_cursor
Name                            Null?    Type
------------------------------- -------- ----
SADDR                                    RAW(4)
SID                                      NUMBER
USER_NAME                                VARCHAR2(30)
ADDRESS                                  RAW(4)
HASH_VALUE                               NUMBER
SQL_TEXT                                 VARCHAR2(60)

>From: Szecsy Tamas <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
>Subject: The number of used cursors?
>Date: Mon, 23 Jul 2001 05:55:24 -0800
>
>Hi,
>
>I would like to know the the number of used cursors at any given time. Is
>there a select statement that does this for me?  I would like to decide if
>the growing number of concurent users for a given database has reached the
>point where the maximum open cursor init ora parameter got to be increased.
>
>Thank you in advance.
>
>Tamas Szecsy
>--
>Please see the official ORACLE-L FAQ: http://www.orafaq.com
>--
>Author: Szecsy Tamas
>   INET: [EMAIL PROTECTED]
>
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