关闭12C部分参数

转自https://dbanote.github.io/2017/04/18/oracle/%E9%82%A3%E4%BA%9B12c%E4%B8%AD%E6%83%B9%E7%A5%B8%E7%9A%84%E7%89%B9%E6%80%A7%E5%85%B3%E9%97%AD%E5%88%97%E8%A1%A8/git alter system set "_optimizer_aggr_grou

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