在指定对象上获取排他锁。
在指定的毫秒数内尝试获取指定对象上的排他锁。
Attempts, for the specified number of milliseconds, to acquire an exclusive lock on the specified object.
这说明,在创建或删除函数索引时,执行索引的表中始终持有一个排他锁。
This means that an exclusive lock is always placed on the indexed table while a functional index is being created or dropped.
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