LOCKTIMEOUT指定了应用程序为获取锁所等待的秒数。
LOCKTIMEOUT specifies the number of seconds that an application will wait to obtain a lock.
锁快照包含数据库摘要信息、应用程序信息，当然还有锁信息。
The lock snapshot includes database summary information, application information and, of course, the lock information.
当任何一个应用程序所持有的锁数量达到整个锁列表大小的这个百分比时，对该应用程序所持有的锁进行锁升级。
When the number of locks held by any one application reaches this percentage of the total lock list size, lock escalation occurs for the locks held by that application.
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