On 9/6/2013 10:35 AM, Harmen de Jong - CoachR Group B.V. wrote:
We ran into an issue where specific queries are geting non linearly slower when 
the total number of tables grows.

If I recall correctly, query planner's behavior is worst-case quadratic in the number of tables participating in the query. This includes tables mentioned directly, and also those pulled in indirectly via views, triggers or foreign keys.

If I may be so bold, I would say that a design that calls for a database with 10,000 tables doesn't feel right to me.
--
Igor Tandetnik

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