每次数据库调用需要一个新会话和事务。
作业对各订单id执行一次数据库查询。
由于有四个订单id，因此作业执行了四次数据库查询。
Since there are four order IDs, the job performs four database queries.
这种方法的结果是只检索一次数据库即可获取这两组信息。
This approach results in only one trip to the database for both sets of information.
增量备份就是对最近一次数据库全备份以来所有修改了的数据进行备份。
Incremental backup is a backup of all of the data that has changed since the last full database backup.
在层次数据库(HDBMS)中，首先是从严格定义的数据节点树开始的。
In a hierarchical database (HDBMS), you begin with a strictly defined tree of data nodes.
一般而言，层次数据库兴起于 60年代，用在当时的大型机数据处理技术方面。
Generally speaking, h ierarchical databases arose in the 1960s, on the mainframe data processing technology of the time.
这些数据库调用会显示在序列图中，并且还会显示每次数据库访问的响应时间。
These database calls are shown in the sequence diagram along with the response time for each database hit.
对于物理记录的处理：层次数据库中所存储的记录是由应用程序来直接操纵的。
Deals with physical records: The records stored in hierarchical databases are manipulated directly by an application.
这个目标在层次数据库中几乎是自动完成的，但在关系数据库中需要做些工作。
This goal is accomplished almost automatically in hierarchical databases, but takes work in relational ones.
希望在下一次数据库环境中出现问题时，您将能够利用此工具迅速解决该问题。
And hopefully, the next time a problem arises in your database environment, you'll be able to take advantage of this tool to resolve the problem quickly.
用GMK算法只需要扫描一次数据库，并且可以快速减小计算量，实现简单。
GMK only scans the database once, thus it can reduce the quantity of calculation rapidly and can be realized easily.
针对单个问题的优化：本质上，层次数据库就通过一条指定的路径来优化数据访问。
Optimized for one problem: By their nature, hierarchical databases optimized access to the data through one specific path.
gnolia一项在线书签服务，上周表示它不能恢复在一次数据库崩溃中损失的用户数据。
Ma.gnolia, an online bookmarking service, said last week it had been unable to recover users' data lost in a corrupted database.
提出一种建立WPI专利文献二次数据库的新方法并对专利文献进行计算机量化分析。
This paper presented a new method for quantitatively analyzing the secondary data - base of WPI.
第三，通过对工程数据库的研究，运用逻辑层次数据库存储图形约束及水工图库的管理。
Third, through the study on project database, use the data stock of logic level to store the figure restraint and management of the water conservancy drawing-library.
关系型数据库已经超越了持久性存储设备的角色，它们还解决了上述层次数据库的两个缺点。
They also address the two shortcomings of hierarchical databases listed above. The major characteristics of relational type databases are.
直到内存组中的值耗尽后，两个优化器才会去访问数据库，上面的例子每5个标识值符访问一次数据库。
Neither optimizer will hit the database until it has exhausted its in-memory group values. The above example hits the database every 5 identifier values.
我执行读取操作的顺序是从web层获取请求(需要执行一次数据库查询)并检查之前在缓存中存储的查询结果。
The sequence I follow when performing reads is to take a request (that requires a database query) from the Web tier and check the cache for previously stored results of that query.
要启用这种备份，可以将TRACKMOD数据库配置参数设置为ON(对这个参数的更改要到下一次数据库活动时才生效)。
To enable this kind of backup, set the TRACKMOD database configuration parameter to on (changing this parameter won't take affect until the next database activation).
研究表明，该方法不仅算法简单、只需扫描一次数据库，而且还具有动态剪枝、不保存中间候选项和节省大量内存空间等优点。
Studies show that the method is not only simple that needs to scan the database only once, but also has the virtues such as dynamic pruning, without saving mid items and save lots of memories.
唯一的问题是新创建的或者最近被移动过的文件也许在下一次数据库更新前不能被正确的找到，而你也没有太多选项来设定搜索的范围。
The only problem is that newly created or moved files may not be found correctly until the next database update, and you don't have many options to choose from for your search.
大多数情况下，就用户而言，他们不关心我们的工作是使用层次数据库、关系数据库、面向对象数据库、平面文件系统，还是魔术来完成。
In most cases, users don't care if their job is accomplished with hierarchical databases, relational databases, object-oriented databases, flat-file systems, or black magic.
每个线程模拟一个用户，该用户连接到数据库并提交一个事务流，而不考虑次数。
Each thread simulates a user that connects to the database and submits a stream of transactions without think times.
这种方法不但能够降低网络开销，而且在EJB内部通过为整个业务功能创建一个事务环境也可以大大地减少对数据库的访问次数。
Not only will this reduce network overhead, but within EJBs, it also critically reduces the number of database calls by creating a single transaction context for the entire business function.
在这个两部分系列的第一期中，我重点介绍了通过将索引添加到DB 2数据库来减少查询次数的优势和缺点。
In the first installment of this two-part column, I focused on the pros and cons of reducing query times by adding indexes to a DB2 database.
数据库连接次数对于应用程序来说是不变的。
The number of database hits is constant for the application.
数据库的统计值持有有关连接次数的信息，并聚合每个单独语句的额外统计值。
The database statistics hold information about connection times and aggregate additional statistics for each individual statement.
也可以在特定时期内调用该工具一定的次数，帮助您了解随着时间的变化数据库中的变动情况。
The utility can also be invoked a specified number of times within a specified period of time, to help you understand changes over time.
也可以在特定时期内调用该工具一定的次数，帮助您了解随着时间的变化数据库中的变动情况。
The utility can also be invoked a specified number of times within a specified period of time, to help you understand changes over time.
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