您没有访问某些数据库时，这些列会导致该问题。
These columns cause the issue when you do not have access to some databases.
如果将一列添加到正在被访问的表中，DB 2仍然可以在不更改程序代码的情况下操作数据。
If you add a column to the table being accessed, DB2 can still manipulate the data without changing the program code.
首先，我们创建一个基础或者对象模型，从分析需求、访问定义，以及数据提取的列映射开始。
First, we cover creating an infrastructure or an object model that starts with a request, access definition, and column maps for data extraction.
当创建此扩展时，可以在您的表中以列绑定的形式访问结果。
When you create this extension, you can access the result as a column binding in your table.
借助这个特性，数据管理员可以在表的列和行级别控制用户和组的读写访问。
Using this feature, data stewards can control read and write access for users and groups at the table column and row level.
主复制要求所有节点通过访问主节点来获得关于表、列和主键的字典信息。
Master replicates require all nodes to access the master node to obtain the dictionary information about tables, columns, and primary keys.
尽管有些工具可以访问xml列中的数据，但是大部分都不能够将复杂xml格式化为对报告有用的结构。
While some can access data in an XML column, many don't have facilities to format complex XML into a structure that is meaningful for reports.
DB 2UDB通过解析sql语句来确定必须访问哪些表和列，从而完成该操作。
DB2 UDB accomplishes this by parsing the SQL statement to determine which tables and columns must be accessed.
最后，如果可能的话，将SELECT中所有的列包括到索引当中，这样就不需要访问表中的行。
Finally, if possible, include all of the columns in the SELECT in the index, so that there is no need to access the table rows.
这个单值是转换表的定位器，存储过程用它来访问转换表的列。
This single value is a locator to the transition table, which the procedure USES to access the transition table columns.
IDS中的 LBAC实现允许控制谁可以访问一个表中个别行和列中的数据。
The IDS implementation of LBAC allows control over who can access data in individual rows and columns of a table.
最后，值得注意的是，您可以创建专门的xml索引来加快对xml列中的数据的访问。
Finally, it's worth noting that you can create specialized XML indexes to speed access to data stored in XML columns.
例如，某一列被访问的频率超过预期；某个表远远大于预期；某些查询比预期执行得更频繁。
For example, a column is being accessed more frequently than anticipated; a table is much larger than anticipated; certain queries are being performed more frequently.
LBAC特性为控制对各行和各列的读写访问提供了更细的粒度。
The LBAC feature provides for greater granularity for controlling read and write access to individual rows and table columns.
可以在现有的索引中添加列，让查询处理的一部分只访问索引。
You might add a column to an existing index to get index-only access for a portion of the query's processing.
在这些属性中，rows尤其方便，因为您可以使用它来在整个结果集中进行迭代和根据名字访问列数据。
Of these properties, rows is particularly convenient, because you can use it to iterate through the result set and access the column data by name.
AdvancedAccessControlFeature实现了基于标签的访问控制（LBAC），以提供行级和列级保护。
The Advanced Access Control Feature implements label-based access control (LBAC) to offer row-level and column-level protection.
新版本函数将有一个范围有限的散列(scopedhash)，表示只有该函数可以直接访问散列，并且持续到每个调用中，因此将是一个很好的缓存。
The new version will have a scoped hash, meaning only the function can access the hash directly and it is persistent through every call, so it will be a good cache.
更具体地说，ArcExplorer访问具有（已注册）空间列的视图。
More specifically, ArcExplorer accesses a view that has a (registered) spatial column.
我们简要的测试比较了通过客户机和通过联邦连接访问包含1个或多个lob列的DB 2luw表的访问。
Our brief tests compared access to DB2 LUW tables containing one or more LOB columns through both normal client and federated connections.
INDEXESHITREPORT部分有一个TOTALhits列，它表明索引被访问的次数。
The INDEXES HIT REPORT section has a TOTAL HITS column that indicates how many times an index was accessed.
这些编目描述了数据库对象，例如表、列和索引，并包含关于用户所拥有的访问这些对象的访问类型的信息。
The catalog describes the database objects, such as tables, columns, and indexes, and contains information about the types of access that users have to these objects.
在为每个客户添加数据库实例时，或者在每个表中创建一个数据列以验证客户是否访问合适的数据时，这种设计会大大增加表的数量。
This design increases the number of tables significantly over adding a database instance per customer or creating a column in each table to validate whether the customer is accessing the proper data.
如果一个用户试图访问一个受保护的列，而他们的LBAC凭证又不允许他们访问该列，那么这样的访问将失败，用户收到一条错误消息。
If a user tries to access a protected column that their LBAC credentials do not allow them to access, then the access will fail and they will get an error message.
用户可以访问同一列表中的某一特定客户更加详细的视图。
The user could access a more detailed view of a specific customer from that same list.
LBAC让用户定义确切地定义哪些人有对某行和列的写访问权，哪些人又有读访问权。
LBAC lets users decide exactly who has write access and who has read access to individual rows and individual columns.
如果用户出现在禁止访问列表中，或没有列在允许访问列表中，那么就不能授予该用户访问服务器的权限。
If a user is listed in a deny access list or is not listed in an allowed access list, then the user cannot be granted access to the server.
此外，将从第1列开始访问，而不是第0列，这可能是问题的另一个根源——这进一步促使了显式查询的使用。
In addition, columns are accessed starting with 1, not 0, which can be another source for problems — this is further impetus for being explicit.
也可以将经常被访问的数据作为include子句中的列包含在索引中。
Frequently accessed data can also be included within an index as included columns.
逻辑记录：表中的列是通过列名而非记录偏移量来访问的。
Logical records: The columns in a table are accessed through column names, not record offsets.
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