speeding up tests with Postgres

speeding up tests with Postgres


Dear Lazyweb,

Im developing a site using Django and Postgres. How can I get my tests to run a lot faster?

Answer: tell Postgres to use a tablespace in RAM. Selects, updates, and inserts will run at fast RAM speed vs slow disk speed.

Caveat: this doesnt work for writes. Postgres is designed to keep data reliable at all times. Any INSERT/UPDATE/DELETE gets written to a "write-ahead log" (WAL), so that if the database crashed itll restore the data.  Since this is on a disk no matter what the tablespace, the above trick doesnt work without defeating the WAL.

Answer2: use UNLOGGED tables, TBD.

Reference:

Unlogged table performance in postgresql 9.1: (2011) "unlogged tables have shown an increase of output by 13~17%"; includes performance-oriented Postgres settings.

WAITING FOR 9.1 � UNLOGGED TABLES (2011): "thats really fast"

wal_buffers performance by Robert Haas (2012): pretty graphs

download file now

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