LMT & ASSM資料檔案塊分配圖示

gaopengtttt發表於2012-02-01
 

根據dump的結果,在word裡面畫了一個非常簡單的示意圖,每個資料檔案最前面的8個塊,是LMT用於管理extent分配的。
更詳細的文件可以參考itpub電子雜誌internal專刊中piner關於LMT和ASSM的文章。

資料檔案(
LMT+ASSM)(每格為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


資料檔案(
LMT)(每格為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

來自 “ ITPUB部落格 ” ,連結:http://blog.itpub.net/7728585/viewspace-715429/,如需轉載,請註明出處,否則將追究法律責任。

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