From e4a0d0b2bd79a0ccd399ee72e0c3a3ef39068009 Mon Sep 17 00:00:00 2001 From: Julien Rouhaud Date: Thu, 2 Mar 2017 23:03:55 +0100 Subject: [PATCH] Define hypothetical indexes in the README --- README.md | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/README.md b/README.md index b6ff2e0..e25edfb 100644 --- a/README.md +++ b/README.md @@ -3,6 +3,14 @@ HypoPG HypoPG is a PostgreSQL extension adding support for hypothetical indexes. +An hypothetical, or virtual, index is an index that doesn't really exists, and +thus doesn't cost CPU, disk or any resource to create. They're useful to know +if specific indexes can increase performance for problematic queries, since +you can know if PostgreSQL will use these indexes or not without having to +spend resources to create them. For more information on this extension usage, +you can see [this blog +post](https://rjuju.github.io/postgresql/2015/07/02/how-about-hypothetical-indexes.html). + This project is sponsored by [Dalibo](http://dalibo.com). Installation