Front Row Only 只有头排
For example, you may want to find all customers in Paris and hope to retrieve rows 1, 4, 5, and 7. However, if you search for the value "Paris," only row 7 is returned.
例如,可能希望找到Paris的所有客户,也就是希望获取第1、4、5和7行。但是,如果搜索值“Paris”,那么只会返回第7行。
In fact, the only row-level locking that remains during INSERT is the next-key locks that are required to protect an INSERT from adding keys to repeatable read scanners.
实际上,在INSERT期间惟一保持的行级锁是next - key锁,这个锁用于使INSERT不会添加键到可重复的读扫描器。
A week later, they were asked to sleep for only four hours every night for two nights in a row.
一周后,他们被要求连续两晚每晚只睡四个小时。
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