breakpoints in eclipse using postgresql

hi,

I am using helios Eclipse for debugging my code in postgresql.

My aim is to know how postgresql uses join algorithms during the join
query, so I started to debug*nodenestloop.c* which is in the Executor
folder.

I gave break points in that file, But whenever I try to debug that file,
the control goes to main.c and never comes back,How do I constraint the
control only to that particular file(nodenestloop.c)

Below are the following fields which I gave in Debug configurations of
Helios Eclipse.

*C/C++ Application - src/backend/postgres* and *project - pgsql*

I followed the steps given in the following link for running the program.

https://wiki.postgresql.org/wiki/Working_with_Eclipse#

I even uncheked the field "*Start on Start up=main*" , but When I do that,
The *step in and Step over*buttons are not activated and the following
problem has popped up.

*Could not save master table to file
'/home/ravi/workspace/.metadata/.plugins/org.eclipse.core.resources/.safetable/org.eclipse.core.resources'.
/home/ravi/workspace/.metadata/.plugins/org.eclipse.core.resources/.safetable/org.eclipse.core.resources
(Permission denied)*

So I started eclipse using sudo, but this time the following error has come
in the console of eclipse.

*"root" execution of the PostgreSQL server is not permitted. The server
must be started under an unprivileged user ID to prevent possible system
security compromise. See the documentation for more information on how to
properly start the server.*

Could any one help me with this.

Thank you