Introducing HypoPG, hypothetical indexes for PostgreSQL

“DALIBO is proud to present the first release of HypoPG, an extension that adds hypothetical indexes in PostgreSQL.

An hypothetical index is an index which doesn’t exists on disk. It’s thefore almost instant to create and doesn’t add any IO cost, wether at creation time or at maintenance time. The goal is obviously to check if an index is useful before spending many time, I/O and disk space to create it.

With this extension, you can create hypothetical indexes, and then with EXPLAIN check if PostgreSQL would use them or not…”

http://www.postgresql.org/about/news/1593/

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