> An another question .. How does the enterprise customers using PostgreSQL can 
> subscribe to official support ?

Please take a look at this URL:
https://www.postgresql.org/support/

Best reagards,
--
Tatsuo Ishii
SRA OSS LLC
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp


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