This event controls the concurrency between clients of the library cache. It acquires a lock on the object handle so that either:
One client can prevent other clients from accessing the same object
The client can maintain a dependency for a long time which does not allow another client to change the object
This lock is also obtained to locate an object in the library cache.
| 欢迎光临 重庆思庄Oracle、Redhat认证学习论坛 (http://bbs.cqsztech.com/) | Powered by Discuz! X3.2 |