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.
排他锁。除加锁进程外其他进程没有对已加锁文件读写访问权限。
LOCK_EX an exclusive lock. This denies all other processes both read and write access to the file.
在指定的一段时间内，尝试获取指定对象上的排他锁，并自动设置一个值，指示是否获取了该锁。
Attempts, for the specified number of milliseconds, to acquire an exclusive lock on the specified object, and atomically sets a value that indicates whether the lock was taken.
在DB 2 9.7之前，AppB发出的语句会被挂起，因为它要等待释放AppA (writer)的update语句持有的排他锁。
Prior to DB2 9.7, the statement issued by AppB would hang because it would wait for the exclusive lock held by the update statement of AppA (the writer) to be released.
Exclusive并发策略使得当一个bean与一个事务相关联时，WebLogicServer会在缓存的实体e JB实例上放置一个排他锁。
Exclusive concurrency strategy causes WebLogic Server to place an exclusive lock on cached entity EJB instances when the bean is associated with a transaction.
由于JVM的锁语义是悲观和排他的，因此当把协调关系放到Terracotta中实现，我们就能够在集群中提供更多的支持。
While that JVM was pessimistic and exclusive in its locking semantic, we could support so much more out in the cluster where coordination was implemented in Terracotta.
import工具实现这一点的方法是在ALLOWNOACCESS导入操作的开始请求目标表上的一个排他（X）锁。
The import utility accomplishes this by requesting an exclusive (X) lock on the table at the beginning of an ALLOW NO ACCESS import operation.
load工具实现这一点的方法是，请求目标表上的一个超级排他（Z）锁，并在加载操作期间一直持有这个锁（参阅清单4）。
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).
load工具实现这一点的方法是，请求目标表上的一个超级排他（Z）锁，并在加载操作期间一直持有这个锁（参阅清单4）。
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).
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