因为这个原因,位图索引不适合于OLTP应用。
For this reason, bitmap indexes are not appropriate for many OLTP applications.
那么得先找出这个表有哪些索引,哪些索引是位图索引,怎么查呢?
Mark all index fragments of all bitmap indexes defined on the table UNUSABLE and rebuild them once the operation is complete.
哈希索引亡储模式从要非判续索引数据非否亡反在,树立索引数据的位图索引。
Hash index model is to check the index data and create the bitmap index of the index data.
在利用位图索引求解成员查询时,减少对位图的重复扫描可以有效地提高查询的效率。
When membership queries are evaluated with bitmap indices, the performance can be improved if the number of bitmaps to be scanned is reduced.
位图索引:它适用于不同值的数量是非常少的也大多使用的表,很少更新或不更新所有。
BITMAP Indexes: It is used when the number of distinct values is very less also mostly used on tables that are very less updated or not updated at all.
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。
Oracle Learning Resources, including the ROWID of the concept, the concept of indexing, unique indexes, composite indexes, bitmap indexes and function-based indexes.
数组的索引存储在一个64位的位图中,找到最高优先级的任务是很容易的。
The array indices are stored in a 64-bit bitmap, and finding the highest priority task is very trivial.
表明位图的颜色映射到一个索引的调色板。
Indicates that a bitmap's colors are mapped to an indexed palette.
直接建立维度表与事实表的位图连接索引会产生大量无用的索引项,影响查询效率。
Building bitmap join indexes of dimension tables and fact tables directly may bring a large number of useless index items that affect query efficiency.
该算法引入了线性索引技术和LZC算法标志位图,采用了类似于SPIHT算法的扫描顺序,将待编码流按不同种类进行算术编码。
The algorithm integrates the linear indexing technique and flag map which LZC adopts, USES the scan order which is the same of SPIHT algorithm, sends the coding stream into MQ in code process.
不能使用带有位图类型索引的全局分区。该分区将被设置为默认值。
Cannot have global partition with bitmap type index. The partition will be set to default.
文中提出了一种基于数据仓库和位图连接索引的查询方法。
This paper will optimize the processing of join query based on join index.
文中提出了一种基于数据仓库和位图连接索引的查询方法。
This paper will optimize the processing of join query based on join index.
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