NOTE: fedora 17 x86_64, 7.2.2 can not be compiled in the env, I choose 8.4.0 because I think old version is easier to understand than newer version!
I want to study pg's external sort (in tuplesort.c )through 8.4.0's source code, and use ddd to do it, according to usingddd-postgres 's description:
In the backend mode, you don’t create a separate postmaster process and don’t use psql at all. Instead, you start up postgres from the
command line and directly interact with it.
and after starting postgres in ddd, a backend interactive interface works as doc's Figure 5, and I found version 7.2.2's source postgres'c has backend interactive interface, but my version is 8.4.0, which seemly has not backend interactive interface, so I want to ask
(1) whether I must use another method to debug relative external sort code (in tuplesort.c ), as some post said that I can execute "psql, select select pg_backend_pid(), and gdb pid" , any advice will be appreciated!
