SAIO is a PGXN extension module for PostgreSQL that implements join order search with Simulated Annealing.
The purpose of this module is to encourage attempts to build a non-exhaustive join order optimizer better than GEQO.
Current benchmarks show that currently SAIO generates worse results than GEQO - the current non-exhaustive join order optimizer included in PostgreSQL.
- Open source: PostgreSQL License
- Documentation: http://saio.readthedocs.org
To use SAIO, you will need the PostgreSQL development headers. Compile and install with:
$ make
$ sudo make install
After that log in to your PostgreSQL server with a superuser account and issue:
=# LOAD 'saio';
=# SET saio\_threshold TO 10;
By default all queries with number of FROM elements exceeding saio_threshold will be planned using SAIO. To disable it use:
=# SET saio TO 'false';
Beware, if the module has been compiled against a server with assertion
checking enabled, it will run extremely slowly and it will write debugging
information to the /tmp directory.