Ioannis Theoharis <[EMAIL PROTECTED]> writes: > My question is whether the way, in wich postgresql do this task, is a > transitive closure on table 'pg_inherits' or there is a better approach > implemented (like numbering scheme techniques etc.) ?
It's a transitive closure, and not a very bright one at that; see find_all_inheritors(), find_inheritance_children(), and particularly the comments to the latter. However, we've not heard reports indicating that this is a serious bottleneck in any real-world situation, so no one has spent time to improve it. (I'd expect the per-table planning costs to vastly outweigh the cost of finding those tables, anyway.) regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org