åºæ¬çã«Railsã§ã¯åä¸ã®DBã使ç¨ããããã«è¨è¨ããã¦ãã¾ããã¨ã¯ããè² è·è»½æ¸ã®ããã ã£ããããããã¯æ§ã ãªãããã¿ã®ããã«è¤æ°ã®DBã«æ¥ç¶ããªããã°ãããªãå ´åããã¾ã«ãã£ããããã¨æãã¾ãããããæ®å¿µãªäºã«éãDBã«åãååã®ãã¼ãã«ããã£ãããã¦ã©ãããã ãã³ã¬ã¨ãªããã¨ãç¡ãã¨ã¯è¨ããªãã§ãããã ActiveRecord ã connection pool ã«å¯¾å¿ããã®ã¯ç¥èã¨ãã¦ã¯ç¥ã£ã¦ãã¾ãããè¤æ°ã®DBã«å®éã«ã¤ãªãã«ãã£ãã°ãã connection ã¯ã©ããªãã®ï¼ã¨çåã«æã£ãã®ã§èª¿ã¹ã¦ã¿ã¾ããã # activerecord-3.0.3/lib/active_record/connection_adapters/abstract/connection_specification.rb 51è¡ç® - 82è¡ç® def self.establish_connectio
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