sql - Exception ORA-08103: object no longer exists on using setfetchsize of Hibernate

Question

I'm using Hibernate. I need to fetch around 1000000 records and it will cause timeout exception. So I'm using setfetchsize for 6000 records, so that it will distribute the operation in multiple transactions each of 6000 records.

It will take around 21 hours to fetch all.

But meanwhile retrieving records if somebody deletes one of the record which was to be fetched then I get ORA-08103: object no longer exists.

Now I want to skip that object which is deleted while retrieving. How can I do this?

Answer 1

Most likely that a cursor is opened based on a global temporary table(GTT), which had been created with ON COMMIT DELETE ROWS option. And the cause of the ORA-08103: object no longer exists error is commit statement that followed right after the delete statement. Here is a simple example:

 SQL> declare
  2    type t_recs is table of number;
  3    l_cur sys_refcursor;    -- our cursor
  4    l_rec t_recs; 
  5  
  6  begin
  7  
  8    -- populating a global temporary table GTT1 with sample data  
  9    insert into GTT1(col)
 10      select level
 11        from dual
 12     connect by level <= 1000;
 13  
 14   open l_cur         -- open a cursor based on data from GTT1
 15    for select col
 16          from GTT1;
 17  
 18    -- here goes delete statement
 19    -- and
 20    commit;  <-- cause of the error. After committing  all data from GTT1 will be
 21              -- deleted and when we try to fetch from the cursor
 22    loop      -- we'll face the ORA-08103 error
 23      fetch l_cur    -- attempt to fetch data which are long gone.
 24       bulk collect into l_rec;
 25      exit when l_cur%notfound;
 26    end loop;
 27  
 28  end;
 29  /


ORA-08103: object no longer exists
ORA-06512: at line 24

Recreation of global temporary table with on commit preserve rows clause will allow to safely fetch data from a cursor that is based on that table without being afraid of facing ORA-08103: error.