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最SQL忧化只了解一点点，蒙对了3个http://www.vaikan.com/what-do-you-know-about-sql-performance/

Oracle sid & service_name tips Oracle Tips by Burleson ConsultingDecember 5, 2011Question: What is the difference between the SID and SERVICE_NAME in my tnsnames.ora file?  Why does Oracle have three parame...