[bbk2863] 第54集 - Chapter 14-Using Oracle Dasta Storage Structures Efficiently(00)
2013-05-08 19:12
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本章主要就是讲解,Oracle提供了哪些手段让我们的访问速度更快!
Compare and evalate the different storage structuess
Examine different data access methods
Implement different partitionion methods
最最普通的表
集群表(将几个相互关联的表,一起放在一个块里面,读写的时候只进行一次I/O操作即可.)
本质上就是将表和索引合二为一.作为普通的heap表,其表和索引是分开创建的,占用至少两个segment.而IOT表的创建,将表本身和索引进行了融合,表就是索引,索引就是表.
partitioned table是由若干个普通的heap表组成.一般应用于存储较多的数据.
Rows read in groups
SELECT or DML statements
Table size
Row size,row group,and blockd size
Small or large transactions
Using parallel queries to load or for SELECT statements
有的表,可能会read intensive;对于经常读的表,可以通过添加索引的方式,来提高读的速度.
有的表,可能会write intensive;对于经常写的表,可以通过减少索引或者不加索引,减少redo等措施;
Objectives
After completing this lesson,you should be able to do the following:Compare and evalate the different storage structuess
Examine different data access methods
Implement different partitionion methods
Data Storage Structures
最最普通的表
集群表(将几个相互关联的表,一起放在一个块里面,读写的时候只进行一次I/O操作即可.)
本质上就是将表和索引合二为一.作为普通的heap表,其表和索引是分开创建的,占用至少两个segment.而IOT表的创建,将表本身和索引进行了融合,表就是索引,索引就是表.
partitioned table是由若干个普通的heap表组成.一般应用于存储较多的数据.
Selecting Physical Structure
Factors affecting the selection:Rows read in groups
SELECT or DML statements
Table size
Row size,row group,and blockd size
Small or large transactions
Using parallel queries to load or for SELECT statements
有的表,可能会read intensive;对于经常读的表,可以通过添加索引的方式,来提高读的速度.
有的表,可能会write intensive;对于经常写的表,可以通过减少索引或者不加索引,减少redo等措施;
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