Updating catalog statistics, which emphasizes the importance of collecting and maintaining up-to-date database statistics, the lack of which is often the source of many of the performance problems.
更新目录统计信息，这部分强调收集和维护最新数据库统计信息的重要性，缺少这项工作常常是导致许多性能问题的源头所在。
Instead we opt to design for the lack of transactions and build in failure modes that allow the client to succeed even in the event of database availability issues.
相反，我们选择缺少事务的设计，并加入失效模式，失效模式可以使客户端甚至在发生数据库可用性问题的时候也能继续进行。
Now for the other big difference between the ZODB and a relational database: ZODB objects completely lack any schema specification.
下面讨论一下ZODB和关系数据库之间的其他主要区别：ZODB对象完全缺乏任何模式规范。
Yet experience (including experience with database designs) shows that you need to balance strictness with what, for lack of a better word, I call clarity.
但是经验(包括数据库设计经验)表明，需要在严格性和明确性(因为没有更好的词，暂时用这个词)之间取得平衡。
Another problem is lack of transactions support in Lucene, making saving the domain model into the database and the search engine problematic.
另外一个问题是缺少对Lucene的事务控制，把领域模型数据存储到数据库和搜索引擎是有问题的。
Another issue, and one that Brightkite has no control over, is the lack of a unified places database, as TechCrunch mentioned earlier this morning.
另外一个Brightkite没有解决的问题是没有一个统一的位置数据库，就是TechCrunch今天早晨提到的那种。
Existing security solutions, such as intrusion detection systems (IDSes), lack the knowledge of database protocols and structures required to detect inappropriate activities.
入侵探测系统(IDSes)等现有的安全解决方案不了解探测不正当活动所需的数据库协议和结构。
The lack of a database-level security model makes it difficult to fully leverage ZEO storage servers as clients have more or less unfettered access to the database and must therefore be trusted.
缺乏数据库级别的安全模型使得充分利用ZEO存储服务器变得非常困难，因为客户端或多或少地拥有对数据库的自由访问，因此客户端必须受信任。
The problem, from his point of view, was a lack of mathematical rigor in defining the data model (some database models had no rigor whatsoever).
在他看来，该问题是因为在定义数据模型时缺乏数学严谨性(一些数据库模型没有任何严谨性)。
The web application framework that I have built using PHP does not use stored procedures, database triggers or foreign key constraints, yet it does not suffer from any lack of functionality.
我使用php构建的web开发框架不使用存储过程，触发器和外键，然而不会感到缺乏功能特性的痛苦。
Existing broadcasting scheduling algorithm in the mobile database environment is a certain lack of practicality.
现有的广播调度算法在移动数据库环境中缺乏一定的实用性。
Due to the lack of stable schema in semistructured database, it is hard for users to obtain a clear view of the structure and employ efficient queries.
半结构化数据库没有固定的库模式，用户对其结构难以产生清晰的认识，从而无法有效地查询所需的内容。
When there are a great many of items and transactions in the database, frequent-pattern growth algorithm needs more additional computer memory, which may cause the lack of memory.
当数据库中的项目数目较大且事务数量巨大时，频繁模式增长算法内存开销很大，可能导致内存空间不足的现象。
Functions that update the database should expect their parameters to lack SQL slash escaping when passed.
升级数据库的函数尽量减少参数应该盼望参数在传递过程中减少丢失。
RDBMS in general is completely different from its lack of database triggers and stored procedures.
与一般的RDBMS完全不同，它缺乏数据库触发和预存程序。
Functions of most domestic DRS systems are not perfectly developed at present. Some DRS systems have no real-time module, lack of well-developed FAQ database or short of expert-dispatched.
目前国内大多数数字参考咨询服务系统的功能还不尽完善，有些系统没有实时咨询模块，有些系统则缺乏完整的常见问题库或没有专家调度。
An important feature of the algorithm is that it can infer the network physical topology correctly on the lack of the integrality of the forwarding database of switches.
算法的主要特点是在交换机地址转发表不完整的情况下，有效地实现正确的拓扑推理。
At present, the online database system, but poor universality, lack of openness, only management courses and certain specific topic.
目前，国内外网上试题库系统较多，但是通用性差，缺乏开放性，只能管理特定课程和特定题型。
At present, the online database system, but poor universality, lack of openness, only management courses and certain specific topic.
目前，国内外网上试题库系统较多，但是通用性差，缺乏开放性，只能管理特定课程和特定题型。
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