On Tue, Jul 16, 2013 at 7:00 PM, David Johnston <pol...@yahoo.com> wrote:
> David Johnston wrote > > > > soroosh sardari wrote > >> Hi > >> > >> I want to know how an index is created and used. > >> actually if you can show to me a simple start point, it would be great. > >> > >> Regards, > >> Soroosh Sardari > > In the documentation there is a table of contents and listed on that > table > > is a section named "Indexes". > > > > David J. > > Since you posted this to hacker you may mean you wish to know how to > program > them as oppose to use them in SQL. I have no clue to this regard. If you > did mean "use in SQL" then the documentation is your friend and you also > should not have posted this question to -hackers but to -general instead; > probably should have posted there anyway to begin with and been more clear > as to what you mean by "created and used". > > David J. > > > > > -- > View this message in context: > http://postgresql.1045698.n5.nabble.com/A-general-Q-about-index-tp5763912p5763928.html > Sent from the PostgreSQL - hackers mailing list archive at Nabble.com. > > > -- > Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-hackers > Actually I mean the index in the source code, I want to know how index is used in the backend for execution of some query. sorry my question is a bit ambiguous, I start to read "src/backend/access/index/genam.c", and I think maybe this file is not good way to start. let me write a bunch of question to illustrate my point, -How create an index for a table with specified field -How index is stored in a page -what module is responsible to fetch and swap out index pages -Is there a kind of abstract class for all variant of index?
