How to view the external cursor opened in a session

Hi all
Is there a way to display a cursor open external in a session? Suppose if I want to check if there is a public and open cursor that has been defined in a package, how can I do? I try to play with v$ open_cursor, but I can't make sense.

Best regards
Val

Valerie Debonair wrote:
I want to test a lifetime of a cursor in a session. I don't want to interrogate another session but the same session where the open cursor.

This probably more experimentation rather than useful in the real world. Suppose I have a package that sets a public cursor (as defined in the package spec) but for reasons of bad programming practice, the cursor is not closed and remains in session until the end view of v$ open_cursor can you tell me if an open cursor exists in the session?

How do you know if this open cursor has been consumed (not more data), or not? It might be half an hour old, but still perfectly valid (if using the snapshot has not expired).

I wouldn't say a cursor that was opened for x times a problem. The problem is to have multiple copies of the same open cursor - like which indicates a cursor leak.

Anyway, you can watch the view V$ OPEN_CURSORS performance virtual - but in my test below, that time is is filled not doing a calculation of time would not work. You can continue this and dig deeper into the data dictionary (and the behavior of the Oracle) to determine if your needs can be met.

SQL> --// package defines a static session PL/SQL cursor
SQL> create or replace package FooLib as
  2
  3          cursor c is select object_name from user_objects;
  4
  5  end;
  6  /

Package created.

SQL>  --// open the cursor
SQL> begin
  2          open fooLib.c;
  3  end;
  4  /

PL/SQL procedure successfully completed.

SQL> --// do at least one fetch making sure that the cursor has been "touched"
SQL> declare
  2          s       varchar2(30);
  3  begin
  4          fetch fooLib.c into s;
  5          DBMS_OUTPUT.put_line( s );
  6  end;
  7  /
SYSLIB

PL/SQL procedure successfully completed.

SQL>
SQL> --// the data in v$open_cursor for the PL/SQL cursors we have opened in our session
SQL> select
  2          c.sid,
  3          c.user_name,
  4          c.cursor_type,
  5          c.last_sql_active_time,
  6          t.sql_text
  7  from       v$sqltext t,
  8          v$open_cursor c
  9  where      c.address = t.address
 10  and        c.hash_value =  t.hash_value
 11  and        c.sid = (select sid from v$session where audsid =SYS_CONTEXT('userenv','sessionid') )
 12  and        c.cursor_type = 'OPEN-PL/SQL';

       SID USER_NAME  CURSOR_TYPE          LAST_SQL_ACTIVE_TIME SQL_TEXT
---------- ---------- -------------------- -------------------- ----------------------------------------------------------------
        25 BILLY      OPEN-PL/SQL                               SELECT OBJECT_NAME FROM USER_OBJECTS

SQL>
SQL>
SQL> begin
  2          close fooLib.c;
  3  end;
  4  /

PL/SQL procedure successfully completed.

SQL>
SQL>  --// cursor should now be gone as it was closed
SQL> select
  2          c.sid,
  3          c.user_name,
  4          c.cursor_type,
  5          c.last_sql_active_time,
  6          t.sql_text
  7  from       v$sqltext t,
  8          v$open_cursor c
  9  where      c.address = t.address
 10  and        c.hash_value =  t.hash_value
 11  and        c.sid = (select sid from v$session where audsid =SYS_CONTEXT('userenv','sessionid') )
 12  and        c.cursor_type = 'OPEN-PL/SQL';

no rows selected

SQL>

Tags: Database

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