PGCon 2010

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Reconciling and comparing databases redux

Deploying and testing triggers and functions in multiple databases

The Millburn Corporation is a hedge fund which uses complex data-driven trading models based on the daily prices of various commodities, currencies and other inputs. As part of our application development process, we use independent staging and development instances of our production database to let us have a smoother and less mistake-prone deployment of new models and price streams.

Last year, I presented a talk at PgCon 2009 that examined in broad detail how we make heavy use of different schemas to compare and reconcile data between our different environments. In this talk, I'll examine in detail our attempt to solve a problem we face in our database environment: how to test complex triggers and functions before they're deployed; and how to reconcile and track changes in these functions as they move from our development to our staging and production environments. Specifically, I'll describe how we make use of subversion, pg_dump and pgTAP to roll trigger and function changes to our development environment nightly; and how we test the integrity of the functions and trigger functions on our staging and production environments nightly using pgTAP.

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