如我所说的，SQL指定了要检索或操作什么数据，但没有指定数据库如何完成这些任务。
As I mentioned, SQL specifies what data to retrieve or manipulate, but does not specify how the database accomplishes these tasks.
在这种情况下，DB 2UDB服务器上的调度程序需要连接到工具目录数据库，以便检索运行任务需要的信息。
In this case, the scheduler on the DB2 UDB server needs to connect to the tools catalog database in order to retrieve any required information about the tasks to be run.
当然，如果任务做了一些有趣的事情，则您可以将此数据保存到数据库并在以后检索它 —这是我将要向我的用户的Twitter转发的。
Of course, if a task does something interesting, you can save that data into the datastore and retrieve it at some later point — which is what I'm going to do with my user's Twitter retweets.
在本例中，函数执行SQL调用从数据库中检索现有任务。
In this case, the function executes a SQL call to retrieve the present tasks from the database.
XML任务：编写应用程序或者web服务，来高效地在DB 2数据库中存储与检索xML数据；考虑XML，而不是关系结构。
XML tasks: Write application programs or web services that efficiently store and retrieve XML data from the DB2 database; consider XML, opposed to relational structures.
操作数据库是为已知的任务和负载设计的，如使用主关键字索引和散列，检索特定的记录，和优化“罐装的”查询。
An operational database is designed and tuned from known tasks and workloads, such as indexing and hashing using primary keys, searching for particular records, and optimizing "canned" queries.
SQL语句通常用于完成一些数据库的操作任务，比如在数据库中更新数据，或者从数据库中检索数据。
SQL statements are usually used to complete some tasks of database operations, such as updating the database data or from the database retrieval of data.
SQL语句通常用于完成一些数据库的操作任务，比如在数据库中更新数据，或者从数据库中检索数据。
SQL statements are usually used to complete some tasks of database operations, such as updating the database data or from the database retrieval of data.
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