LMT & ASSM数据文件块分配图示

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根据dump的结果,在word里面画了一个非常简单的示意图,每个数据文件最前面的8个块,是LMT用于管理extent分配的。
更详细的文档可以参考itpub电子杂志internal专刊中piner关于LMT和ASSM的文章。

数据文件(
LMT+ASSM)(每格为1blockblock size8k

 

 

 

 

 

 

 

 

 

FIRST LEVEL BITMAP BLOCK

SECOND LEVEL BITMAP BLOCK

PAGETABLE SEGMENT HEADER

Data Block

Data Block

Data Block

Data Block

Data Block

FIRST LEVEL BITMAP BLOCK

SECOND LEVEL BITMAP BLOCK

PAGETABLE SEGMENT HEADER

Data Block

Data Block

Data Block

Data Block

Data Block

FIRST LEVEL BITMAP BLOCK

SECOND LEVEL BITMAP BLOCK

PAGETABLE SEGMENT HEADER

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

FIRST LEVEL BITMAP BLOCK

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block


数据文件(
LMT)(每格为1blockblock size8k

 

 

 

 

 

 

 

 

 

DATA SEGMENT HEADER - UNLIMITED

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

DATA SEGMENT HEADER - UNLIMITED

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

DATA SEGMENT HEADER - UNLIMITED

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

Data Block

 

 

 

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