row-level lock 行级锁
These locks could be table level, row level, or lock on index, and so on.
这些锁可以是表级锁、行级锁、索引锁等等。
It returns the most recently committed version of the rows, even if another concurrent session holds an exclusive row-level lock.
即使另一个并发会话持有一个独占式行级锁，它仍然返回最近提交的行。
During an export operation, row-level locking is applied to the exporting table, which means that only one lock is held at a time.
在导出操作期间，行级别锁定应用于导出表(exporting table)，这意味着一次只持有一个锁。
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