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。
2
The load utility accomplishes this by requesting a super exclusive (Z) lock on the table and retaining this lock for the duration of the load operation (see Listing 4).