The hang is caused by an exclusive row lock on table EMPLOYEE.
挂起是由表 EMPLOYEE 上一个独占式的行锁导致的。
In the first session, execute the UPDATE statement shown in Listing 16, which places an exclusive lock on the row with department number B01.
在第一个会话中，执行清单16中的update语句，它对部门号为B01的部门行设置独占锁。
The row is formatted in the target page and an X (exclusive) row lock is obtained on it.
在目标页中对该行进行格式化，并获得该行上的一个 X（exclusive，独占的） 行锁。
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