Hur löser man ORA-29471 på dbms_sql.open_cursor?

Den enda anledningen (kan inte se en annan just nu) till att din kod höjer ORA-29471 har du redan gjort dbms_sql kan inte användas i din session genom att ange ett ogiltigt markör-ID:

/* dbsm_sql detects invalid cursor ID in this session  */ 
SQL> declare
  2    c_1 number := 5;  -- invalid cursor ID. There is no cursor 
  3    l_res boolean;    -- opened with ID = 5     
  4  begin
  5    l_res := dbms_sql.is_open(c_1);
  6  end;
  7  /
declare
*
ERROR at line 1:
ORA-29471: DBMS_SQL access denied 
ORA-06512: at "SYS.DBMS_SQL", line 1104 
ORA-06512: at line 5 


/* An attempt to execute this simple anonymous PL/SQL block after 
   an invalid cursor ID has already been detected by the dbms_sql 
   in the current session will lead to ORA-29471 error  
*/

SQL> declare
  2    c_2 number;
  3  begin
  4    c_2 := dbms_sql.open_cursor();
  5  end;
  6  /
declare
*
ERROR at line 1:
ORA-29471: DBMS_SQL access denied 
ORA-06512: at "SYS.DBMS_SQL", line 1084 
ORA-06512: at line 4 

Försök att köra den koden i en nyupprättad session .