2018年11月28日
oracle查询buffer cache中undo大小
摘要： 1.Does undo buffer exists or changes will directly write to undo datafiles?Undo blocks are database blocks, so they will sit in the buffer cache like 阅读全文
posted @ 2018-11-28 21:54 zhjh256 阅读(248) 评论(0) 推荐(0) 编辑
oracle group by placement可能导致错误结果的bug
摘要： Last week I’ve mentioned on Twitter that we ran into wrong result bug. We found workaround quickly but I’ve decided to spend some time to reproduce er 阅读全文
posted @ 2018-11-28 21:17 zhjh256 阅读(266) 评论(0) 推荐(0) 编辑