暂时无法在支持网站上提交享有定期维护的产品表单。 如果您需要我们立即提供帮助，请与技术支持部门联系。 对于由此给您带来的不便，我们深表歉意。
获得即时帮助
完成注册
登录
请求定价
联系销售人员
您已选择一个产品捆绑包。 您能否选择单个产品以便我们更好地满足您的请求。 *
技术支持工程师目前正忙，无法回应您的消息。 如果需要即时服务，请通过我们的服务请求表提交请求。
以下文章可根据您的描述解决您的问题。
Log Sequence Number. This number, which uniquely identifies a point in a database's Log, is used for determining when a page was last modified.
Latch wait events occur when a session needs to acquire a latch that is held by another session. Latches are simple, low-level serialization mechanisms to protect shared SGA data structures and shared code segments from simultaneous session access. They are similar in purpose to locks: latches protect internal memory structures while locks protect data structures. Latch wait events are designed to be very quickly acquired and freed.
The legal agreement that determines how many users can access each Oracle installation. See glossary definitions of Per-Seat Licensing and Per Server Licensing.
Lock wait events occur when a session attempts to acquire a lock that is already held by another session. A session will be blocked until the blocking session releases the lock. Locks are designed to ensure data integrity by limiting simultaneous data access.
Multi-user database locking generally consists of two levels: exclusive locks and share locks. You want to watch out for exclusive locks (that is, TX) as they prohibit resource sharing. For example, the first transaction that exclusively locks a resource is the only one that can alter the resource (except for the DBA) until the exclusive lock is released. Share locks, unlike exclusive locks, allow a resource to be shared.
Most locking issues are application-specific and can be addressed by tuning the concurrency logic in the application.
您可以在附属支持站点上查找适用于戴尔*产品*的在线支持帮助。单击“继续”，转至适用于*产品*的正确支持内容和帮助。
The document was helpful.
选择评级
I easily found the information I needed.
© 2024 Quest Software Inc. ALL RIGHTS RESERVED. 使用条款 隐私 Cookie Preference Center
Quest Software门户不再支持IE 8、9和10，建议将您的浏览器升级到最新版本的Internet Explorer或Chrome。
要升级到IE 11，请单击此处
要升级到Chrome，请单击此处
如果继续使用IE 8、9和10，您将无法充分利用我们所有出色的自助服务功能。
