>    What I would like to know is, if I have changed some ot the modules,
> how can I use GNU gdb to debug the modified codes?

You can run the backend directly from gdb:

 $ gdb postgres
 (set breakpoint)
 > b <routine_to_breakpoint>
 (tell gdb to begin)
 > run -D <path_to_database>
 (enter query at prompt)
  > select xyz from abc...
 (will run until it hits the breakpoint(s))

                   - Thomas

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