Question

I have a cursor returned from Database executes in 31ms (milliseconds) .

But when I use this cursor having more than 1500 rows for fetching rows

  ResultSet rs = (ResultSet)cstm.getObject(6);

  while(rs.next()){
     system.out.println("...");
  }

Just simple transversing through each row of cursor it’s taking more than 40 seconds (40000 ms)

What can be done?

Answer 1

Indeed, by default JDBC use a fetch size of 10.
Thus, if you don’t set a greater value, you’ll call database for next records exactly 150 times …, no need to explain drawbacks of round-trips.

All you have to do is to test performance by setting fetchSize to.. 100 for instance :

statement.setFetchSize(100);

You can play with this number to improve performance according to your environnement.