当她还小的时候，她的祖母每天“神奇地”准时为她准备每一顿饭，尽管她连表都不会看。
When she was young, her grandmother "magically" prepared every meal on time for her every day, even though she could not read a clock.
目标表中的任何行都不会被更新或者删除多次。
No row in the target table should be updated or deleted more than once.
当表持有z锁时，任何并发应用程序都不能读取和更新该表中的数据。
When a table holds a Z lock, no concurrent application can read or update data in that table.
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