行锁定，具有到表锁的升级。
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.
如果知道独占访问不会导致问题，那么就应该尽量使用表锁。
If you know that exclusive access will not cause problems, by all means use table locking.
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