Data remains in the performance database forever unless you delete it manually.
只要不手动删除这些数据，它们就会永远保留在性能数据库中。
To disable Performance Expert Server from collecting data, connect to the performance database and issue one of the following commands
要想禁止PerformanceExpert服务器收集数据，应该连接性能数据库，然后执行以下命令之一
Asphalt pavement performance database and rich text maintenance strategy information database are employed by reasoning mechanism.
基于关系数据库建立了沥青路面使用性能数据库，采用图文格式建立了养护维修知识库；
If you use the long-term history, start a DB2 statement event monitor to collect SQL event monitor data and to store the collected data in the performance database of the performance Expert server.
如果使用长期历史，可以启动db2语句事件监视器来收集SQL事件监视器数据，并把收集的数据存储到PerformanceExpert服务器的性能数据库中。
How do you then profile your system and database performance?
那么您又该如何配置系统和数据库性能呢？
In this trial, we compare the performance of database vendors.
在这个实验中，我们比较了数据库通道的性能。
Performance of database calls, when compared to in-memory operations, is very slow.
与内存中的操作相比较，数据库调用的性能是非常低的。
This improves the performance of the database server.
它改进了数据库服务器的性能。
The size (number of pages) of each primary log has a direct bearing on database performance.
每个主日志的大小(页数量)对数据库性能有直接影响。
The purpose of the buffer pool is to improve database system performance.
缓冲池的用途是为了提高数据库系统的性能。
Another configuration parameter that dramatically affects performance is the database buffer pool size.
另一个极大影响性能的配置参数是数据库缓冲池大小。
This makes DB2 queries use table scans instead of index scans and degrades database performance.
这使得DB 2查询使用表扫描代替索引扫描，并降低了数据库的性能。
Besides the buffer pool, sort is another significant factor that impacts the database performance.
除了缓冲池，排序是影响数据库性能的另一重要因素。
Your database administrator should also review the performance of all aspects of the database.
您的数据库管理员也应该分析数据库的各方面的性能。
By taking advantage of these features, you can manage data more effectively, while delivering optimum database performance.
通过利用这些特性，可以改善数据管理效果，同时提供最优数据库性能。
The scope of this article is database design performance.
本文的范围是数据库设计性能。
Compared to other memory buffers, buffer pools have the most significant impact on database performance.
与其他内存缓冲区相比，缓冲池对数据库性能的影响最为显著。
To ensure optimal database performance, it is necessary to ensure that the database is fully optimized.
为了确保最优的数据库性能，需要确保数据库得到了全部的优化。
Buffer pool contention can be a significant factor in database performance.
缓冲池竞争可以成为数据库性能中的重要因素。
Overwriting free space has an adverse affect on database performance.
覆盖自由空间对数据库性能有负面影响。
To ensure optimal performance of the database engines.
确保数据库引擎的最优性能。
Search online to find a vast number of articles and books dedicated to database performance.
可通过在线搜索查找有关数据库性能的各种文章和书籍）。
However, this will also degrade database performance.
然而，这种方式也会降低数据库性能。
Another important factor that affects SQL statement performance is database statistics.
影响sql语句性能的另一个重要因素是数据库统计。
Other times, you may decide to limit your complexity, and attack database performance instead.
而在其他的一些时候，您可能会决定牺牲数据库性能，以减少复杂性。
Your overall database performance is limited by the bandwidth of your busiest disks.
总体数据库性能受到最繁忙的磁盘的带宽的限制。
Finally, you'll see how you can profile your queries to optimize the performance of your database.
最后，您将了解如何对查询进行分析以优化数据库的性能。
Using a single connection to a database makes optimal database performance difficult to obtain.
如果只使用一个数据库连接，则很难获得最优的数据库性能。
It minimizes the amount of database connections, thus improving overall database performance and throughput.
减少数据库连接的数量，提高了数据库的整体性能和吞吐量。
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