...的物理一致性,在每次修改数据之前,该数据所在的数据页面都将存储在物理日志中,所以物理日志也称为“前镜像”(before images)。逻辑日志用于维护数据库的逻辑一致性,在每次变动数据库时,所有变动情况都将记录在逻辑日志中。
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before-images of modified Data 数据修改以前的映象
Images float before my eyes 万千魅影浮于眼前
Images flort before my eyes 往昔的画面浮现在我眼前
A user-copy table can have the same structure as the source table or it can have a subset of source columns, with or without before images or calculated columns.
User - copy表拥有的结构可以与源表相同,也可以拥有源列的子集,带有或不带有前映像(before image)或计算列。
Some of these images include figures never seen before in France, such as a woman playing a stringed instrument, possibly a character from mythology.
这些图片中有一些包括在法国从未见过的人物,比如一位弹奏弦乐器的女子,可能是神话中的一个人物。
There were images forming in my mind instead of before my eyes.
有画面在我的脑海中而非我眼前形成。
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