Ruby on rails install the oracle driver using gem

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Reference content is as follows: [1] viewing locally installed plug-ins Gem list or Gem list -- local [2] viewing remote available plug-ins Gem list -- romote [3] viewing oracle drivers Gem list -- remote | grep oracle The result is as follows: Activerecord-oracle_enhanced-adapter (1.1.8) [4] installing the oracle driver Gem install activerecord-oracle_enhanced-adapter Display result: Successfully installed activerecord-oracle_enhanced-adapter-1.1.8 1 gem installed Installing ri documentation for activerecord-oracle_enhanced-adapter-1.1.8... Installing RDoc documentation for activerecord-oracle_enhanced-adapter-1.1.8... The installation is successful.