分布键必须由关系列组成，它不能引用xml列。
The distribution key must consist of relational columns, and it cannot reference an XML column.
与以前的DB 2版本一样，一定要通过选择分布键跨分区均匀地分布行。
As with earlier releases of DB2, it is important to select a distribution key that evenly distributes rows across partitions.
在使用DPF时，根据表的分布键(这在创建表时定义)的散列值，把表的每一行放在特定的数据库分区中。
With DPF, each row of a given table is placed in a specific database partition based on the hashed value of the table's distribution key, which is defined when the table is created.
通过在频率分布中生成一个值列表，可以使用值列表本身来推断数据的键属性。
By generating a value list in the frequency distribution, the value list by itself can be used to infer key properties of the data.
分区键不应该包括没有将数据均匀分布或具有少数不同值的列。
The partitioning key should not include a column with unevenly distributed data or with a small number of distinct values.
不恰当的分区键可能导致数据分布不均匀。
An inappropriate partitioning key can cause uneven data distribution.
注意：如果您没有看到数据均匀分布在多个节点上，那就说明您没有指定正确的分区键。
Note: If you do not see an even distribution of the data on the multiple nodes, that indicates that you have not identified the correct partitioning key.
同时，工具不会收集某个键的统计数据，例如多列和分布统计数据。
At the same time, the utility does not collect certain key statistics, such as multi-column and distributed statistics.
在DPF环境中，根据CREATEtable语句中指定的分区键，表中的每个行被分布到一个分区上。
In a DPF environment, each table row is distributed to a database partition according to the distribution key specified in the CREATE table statement.
实际的比例取决于事实表中带有下推键的行的分布。
The actual proportion depends on the distribution of rows with the pushed-down keys in the fact table.
线性扩展的键是在分区上均匀分布的数据。
A key to linear scaling out is the uniform distribution of data amongst the partitions.
散列码应该在键空间上提供均匀的值分布，以便分区负载平衡。
The hash code should provide a uniform distribution of values over the key space so that the partitions are evenly balanced.
分区键需要位于高度惟一的一列或一组列上，从而确保数据均匀分布在该表所定义的所有分区上。
The partitioning key needs to be on a column or set of columns that are highly unique thus ensuring that the data will be evenly distributed across all the partitions that the table is defined on.
具有分布不均匀的数据的列和具有少量distinct值的列都不应该被选作分区键。
Columns with unevenly distributed data and columns with a small number of distinct values should not be chosen as a partitioning key.
如果选定一个好的分区键，那么数据会均匀地分布在所有节点，对于大多数情况都是如此，如果不是这样，请进行查询，分区键将惟一地标识包含数据的节点。
If a good partitioning key is chosen, the data will be evenly distributed across the nodes, and for most, if not all, queries, the partitioning key will uniquely identify the node containing the data.
沿着外壳，分布着电源键、拍摄键、USB接口，以及一组极其灵敏的滑动装置，能够移动F2镜头和实现8倍变焦。
Power and shutter buttons, a USB port, and a touch-sensitive strip to move the F2 lens through its 8X zoom range are arranged along the sides.
不幸的是，这种“座曲式”结构的键盘早就被“橡胶圆点”式键盘所取代了。后者的键帽下附有小按棒，按键被摁下时按棒就会触动分布在一层塑料薄膜上的橡胶圆点。
The buckling spring method, unfortunately, has long been replaced by the 'rubber dome,' where little sticks on the underside of the keys press down on rubber domes laid on a plastic underlay.
DATABASEPARTITIONING——按照键散列将数据分布在数据库的多个逻辑节点上(DPF)。
Database PARTITIONING - distributing data by key hash across logical nodes of the database (DPF).
通过对上述两个表的连接键(pdb_id)进行散列处理来分布两个表也能确保给定pdbml文档中所有原子行均能作为本身的PDBML文档存储在相同的数据库分区中。
Distributing both tables by hashing on their join key (pdb_id) also ensures that all atom rows for a given PDBML document are stored in the same database partition as the PDBML document itself.
研究了一类非零键渗透率满足均匀分布的随机多孔介质逾渗模型。
A percolation model of random porous media, with its nonzero bonds obeying the uniform distribution, is researched in this article.
在键的表面上力的分布是非常复杂的。
The distribution of the force on the surfaces of a key is very complicated.
建立了各种分布情况下，每个类金属原子平均所占金属-类金属键数与类金属含量的关系图。
The relation between the average number of metal-metalloid bond around one metalloid atom and the metalloid atom content in various distributions is established.
探讨了解离机理与分子的电荷分布和断裂键的势能曲线之间的关系。
We have also explored the dependence of dissociation mechanism on charge distribution and potential energy curve of broken bond.
而在分子轨道理论里，我要告诉你们的时，我们任为电子分布在整个分子中，它们不仅仅是和，一个原子或者一个键有关。
Whereas in molecular orbital theory, what I'm telling you is instead we understand that the electrons are spread all over the molecule, they're not just associated with a single atom or a single bond.
结合蒙特卡罗模拟出的气隙空间电子平均能量分布，指出了断裂特定共价键所需输入的电压值。
In terms of average energy distribution of air gap with Monte Carlo simulation, the corresponding voltage to dissociate the given covalent bond is indicated.
得到了它们的基态能量，基态自旋多重度，分子轨道组成与能级，电荷分布与键序。
The total energies, spin multiplicities, charge distribution, bond orders, the front molecular orbital compositions and orbital energies have been obtained.
从而提出了基于虚拟二叉键树的分布式索引模型及其构建算法。
Then a model based on virtual binary key tree is put forward and the construction algorithm is given.
第二种构成，需要空间非极性，就是需要极性键的空间对称分布。
The second way to have something that is net nonpolar is to have spatially symmetric disposition of polar bonds.
用半经验的量子化学PM3方法研究了反应物和产物的电子结构，得到了产物的最优构型和电荷键序分布以及反应焓变。
The electronic structure of products and reactants were studied by molecular orbital PM3 method. The reaction enthalpies and optimized configuration for products were obtained.
空间对称的极性键分布，还是会导致整个分子为非极性分子。
Symmetric disposition of polar bonds still results in a nonpolar molecule.
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