Fastest way to iterate through large table using JDBC

Question

I\'m trying to create a java program to cleanup and merge rows in my table. The table is large, about 500k rows and my current solution is running very slowly. The first thi

Answer 1

One thing that helped me was Statement.setFetchSize(Integer.MIN_VALUE). I got this idea from Jason's blog. This cut down execution time by more than half. Memory consumed went down dramatically (as only one row is read at a time.)

This trick doesn't work for PreparedStatement, though.