What is the performance impact of non-unique indexes in pandas?
熊猫的非唯一索引对性能有什么影响?。
If the MQT happens to have a key, unique indexes should be created to reflect the fact.
如果MQT具有一个键，那么应该创建惟一的索引以反映这一事实。
Like RDBMS indexes, you can create compound indexes using multiple attributes, and unique indexes, which ensure that duplicate values are not allowed.
与RDBMS索引相似，可以使用多个属性创建复合索引，也可创建唯一索引，确保不存在重复的值。
Oracle Learning Resources, including the ROWID of the concept, the concept of indexing, unique indexes, composite indexes, bitmap indexes and function-based indexes.
Oracle学习参考，包括ROWID的概念、索引的概念、唯一索引、组合索引、位图索引和 基于函数的索引等。
These lexicons can be implemented from special indexes, which in turn can require unique element names.
这些词典可以从特殊的索引实现，而索引又需要唯一元素名称。
For indexes that are not unique, the number of index keys is less than the number of records.
对于那些不是唯一的索引，索引键的数量要少于记录的数量。
Creation of indexes, unique or otherwise, helps read the data from MQTs in an efficient manner, resulting in better performance.
索引的创建，惟一或不惟一，都有助于以不同的方式从MQT读取数据，导致更好的性能。
Databases pose separate, unique challenges; so, if possible, your indexes and redo logs should also reside on separate physical disks.
数据库具有独特的困难；如果可能，索引和重做日志也应该位于不同的物理磁盘。
Databases pose separate, unique challenges so, if possible, your indexes and redo logs should also reside on separate physical disks.
数据库提出了不同的、独特的要求，如果可能，您的索引和重做日志也应该位于不同的物理磁盘。
Index options like UNIQUE and CLUSTER, and access methods like B-Tree, R-Tree and user-defined access methods can apply to both functional and non-functional indexes.
诸如unique和CLUSTER等索引选项，以及B -Tree、r -Tree等访问方法和用户定义的访问方法，可以同时应用于函数索引和非函数索引。
How do we now find out how unique our indexes are?
现在，我们如何查明索引是不是惟一的呢？
There are two types of Primary Indexes - unique Primary Index (UPI) and Non-unique Primary Index (NUPI).
有两种主索引—惟一主索引(upi)与非惟一主索引(NUPI)。
You can also drop primary keys, indexes, and unique constraints from the update script.
您也可以从更新指令码置放主索引键、索引和唯一的条件约束。
Displays a list of all of the names of columns in this database that have unique single-column indexes.
显示此数据库中具有唯一单列索引的所有列的名称列表。
Use this dialog box to create or modify indexes, primary keys, and unique keys.
使用此对话框可以创建或修改索引、主键和唯一键。
Indexes are not just for the primary keys or the unique keys.
索引并不只是为了主键或者唯一键。
The wine obtained was featured by bright transparency and unique flavor of Pachyrhizus. With all the indexes up to the national standards, the wine is suitable for expanded production.
酿造出的凉薯果酒清亮透明，具有独特的凉薯香味，各项指标均符合国家标准，适合扩大生产。
The wine obtained was featured by bright transparency and unique flavor of Pachyrhizus. With all the indexes up to the national standards, the wine is suitable for expanded production.
酿造出的凉薯果酒清亮透明，具有独特的凉薯香味，各项指标均符合国家标准，适合扩大生产。
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