数据锁定技术是多用户数据库系统极其重要的技术。
The technology of locking data is most important for the system of multiple users database.
带着这样的思想，我们可以避免在事务处理一开始就锁定数据。
With this kind of thinking, locking the data in the beginning of the transaction can be avoided.
如果使用悲观会话锁定，它通常只用于阻止其他用户进行更新，而不是阻止对锁定数据的读取。
If pessimistic session locking is used, it should generally only be used to block other users from updating; it should not block reads of the locked data.
主动成员上尝试访问故障成员上锁定数据的应用程序将短暂地处于锁定等待状态，默认情况下不会接受任何错误。
Applications on active members trying to access the locked data on the failing member will be briefly in a lock-wait state, and by default will not receive any errors.
当尝试访问出错成员上被锁定的数据时，活跃成员上的应用会暂时处于锁定等待状态，而且默认情况下他们不会收到任何错误。
Applications on active members trying to access the locked data on the failing member are briefly in a lock-wait state, and by default they do not receive any errors.
方式：指定了锁的拥有者所允许的访问类型，以及对锁定数据资源的并发用户许可的访问类型。
Mode: Specifies the type of access allowed for the lock owner as well as the type of access permitted for concurrent users of the locked data resource.
悲观会话锁通常为写入锁，它们允许其他用户读取锁定的数据，除非遇到不能读取的情况。
Pessimistic session locks should generally be write locks; they should let other users read the locked data, unless there is a very strong case to not do so.
这些数据可被“锁定”一段时间，因此使用时需谨慎。
This data can be "locked" for a substantial time period, so should be used judiciously.
但是，这种方法效率不高，无论是从编程时间还是从同时发生多个数据库锁定时数据库的利用率来说。
However, this is not efficient, either in programming time or in utilization of the database if multiple database locks could be held at one time.
对象：标识被锁定的数据资源。
锁定是数据库管理器用来控制多个应用程序并发访问数据库中数据的机制。
Locking is the mechanism that the database manager USES to control concurrent access to data in the database by multiple applications.
在图4中，数据库服务是“中枢”，其中存在某种类型的延迟，如数据库中的锁定争用或网络问题。
Within Figure 4, the database service is a "backbone" and is experiencing some sort of latency, such as lock contention in the database or network issues.
本文概要介绍了DB 2UD b数据移动工具的锁定行为，并概述了运行这些工具时，对数据的并发访问是如何管理的。
This article Outlines the locking behavior of the DB2 UDB data movement utilities, and provides an overview of how concurrent access to data is managed while these utilities are running.
在保持数据完整性的同时，它们控制对后端数据的访问并在内部对当前事务和数据库锁定进行管理。
They control access to the back-end data and internally manage current transactions and database locking while preserving data integrity.
大小：指定要锁定的数据资源部分的物理大小。
Size: Specifies the physical size of the portion of the data resource that is being locked.
而间接产生的数据(比如日志数据)与锁定无关，因此不在任务的范围内。
Data indirectly created as a side effect (e.g., log data) falls outside of this mission, as it isn't particularly relevant to lock-in.
使用手机数据可以帮助锁定广告和对本地服务进行等级划分。
Mining cell phone data could help target ads and rank local services.
数据库访问通常会对被查询的数据进行读锁定，在数据更新后会变成更新锁定。
The normal behaviour of a database access is to get a read lock on the queried data, which gets transformed into an update lock if data is updated.
Walrus现有版本不提供一致数据和对象锁定。
The current version of Walrus offers inconsistent data and no object locking.
POSIX通过 pthread_mutex数据类型提供锁定和同步支持。
POSIX provides locking and synchronization support through the pthread_mutex data type.
隔离级别决定在访问数据时数据是如何锁定的、如何与其他进程隔离的。
An isolation level determines how data is locked or isolated from other processes while the data is being accessed. Following are details about the different isolation levels.
该帐户的数据库记录是锁定的(取决于数据库管理系统，可能锁定多个余额)。
The database record (s) for that account is locked (depending on the database management system, more than just a single balance might be locked).
其结果是：处理数据库锁定与同步的方案非常复杂，若不考虑数据库锁定与同步问题又会失去数据的完整性。
This often results in highly complex schemes to deal with database locking and concurrency, or alternatively, loss of data integrity when these issues are not considered.
当使用支持此功能的联合服务器时，需要对其数据库锁定策略进行仔细分析，以避免对源系统的性能造成负面影响。
When using federation servers that support this functionality, they need to be carefully analyzed on their database locking strategies to avoid negative impact to the performance of source systems.
正如前面提到的那样，EJB组件控制着对后台数据的访问，并管理着当前事务和数据库的内部锁定。
As mentioned previously, the EJB components control the access to the back-end data and manage the current transactions and database locking internally.
当编校服务器连接到ECM服务器上的存储库(数据存储)时，它会锁定存储库。
When the redaction server is connected to the repositories (the data store) on the ECM servers it locks the repositories.
容器将用能被目标数据库接受的最低级锁定来装载数据。
The container will load the data with the weakest lock available for the targeted database.
由于执行上的依赖，数据库中的锁定会影响到整个应用。
Due to execution dependencies, a lock-up in the database could impact the application.
使用专业的数据库解决方案，可以通过数据库引擎来解决锁定和数据损坏的问题。
With a professional database solution, the problems of locking and corruption are resolved by the database engine.
这将导致许多问题，如数据完整性、锁定策略以及数据库人员所熟知的一些问题。
That leads to many issues of data integrity, locking strategies, issues that are well known to database people.
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