EnterpriseDB announced the results of the survey they did a few months ago at OSCON. Now, take the results with a grain of salt as it was done by EnterpriseDB. EnterpriseDB is based on Postgres so there is a vested interest in making Postgres sound good. Results can be skewed depending on how the survey is worded, what options are available as answers and who the respondents are.
The results summary is available for free.
Some key facts:
500 respondents. The download page says "500 corporate IT leaders". Or maybe, 500 open source developers. ;-)
Only 9% of respondents indicated that they preferred commercial solutions over open source solutions. I would guess that a majority of those responding …
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