https://qooah.com/2016/01/29/%e4%b8%ad%e5%9c%8b%e7%a7%bb%e5%8b%95%e8%ab%8b%e8%8c%b6%e6%b0%b4%e5%8a%a9%e7%90%86%e9%83%bd%e8%a6%81%e8%ad%98-unix%e3%80%81linux%e3%80%81oracle-rdbms-%e5%8f%8a-ivr-system-%e6%9c%ac%e7%b6%b2%e8%80%81/