如何通过dba_hist_active_sess_history分析历史数据库性能问题
原文地址:https://blogs.oracle.com/Database4CN/entry/%E5%A6%82%E4%BD%95%E9%80%9A%E8%BF%87dba_hist_active_sess_history%E5%88%86%E6%9E%90%E5%8E%86%E5%8F%B2%E6%95%B0%E6%8D%AE%E5%BA%93%E6%80%A7%E8%83%BD%E9%97%