• 1. 主键索引: PRIMARY KEY | Primary Key Index | PK Index
• 2. 非主键索引: secondary index
• 3. 组合主键索引: Composite Key Index

更多释义

• 1.系统依据属性的类型决定是否要基于此属性创建非主键索引、是否要保存此非主键索引。
  The system determines whether it needs establishing and reserving the non-primary index by the classification of the attribute.
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• 2.为了更好地解释说明基数估计值的提高，撤销除主键索引外的所有employee表上的现有索引。
  To better illustrate the improvement in cardinality estimation, drop all the existing indexes on the EMPLOYEE table except the primary key index.
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• 3.在分析了用于查找内存数据的非主键索引的特性之后，设计并实现了一个适合于内存数据库的非主键索引机制。
  After analyzing the characteristics of the non-primary index used to search the data in the main memory, a new non-primary index system is designed and implemented which fits to MMDB.
  dict.yoduao.com

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