On 07/16/2013 11:09 PM, soroosh sardari wrote: > > 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? Start with the documentation: http://www.postgresql.org/docs/current/static/internals.html particularly: http://www.postgresql.org/docs/current/static/indexam.html http://www.postgresql.org/docs/current/static/gist.html http://www.postgresql.org/docs/current/static/catalog-pg-index.html http://www.postgresql.org/docs/current/static/catalog-pg-am.html That should give you the ground work to understand the source code a bit better. Then feel free to return with specific questions you don't feel are explained by the documentation or code comments and aren't obvious from the code. -- Craig Ringer http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training & Services
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