通常Web应用程序有页锁和行锁。
该锁是与正在被导出的行相关联的行锁。
That lock is the row lock that is associated with the row being exported.
当获得少量的行锁时，行锁就会自动地逐渐升级为表锁。
After some small number of row locks are obtained, a lock escalation to a table lock will occur automatically.
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