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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1个block，block size为8k）
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FIRST LEVEL BITMAP BLOCK |
SECOND LEVEL BITMAP BLOCK |
PAGETABLE SEGMENT HEADER |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
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FIRST LEVEL BITMAP BLOCK |
SECOND LEVEL BITMAP BLOCK |
PAGETABLE SEGMENT HEADER |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
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FIRST LEVEL BITMAP BLOCK |
SECOND LEVEL BITMAP BLOCK |
PAGETABLE SEGMENT HEADER |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
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Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
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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1个block，block size为8k）
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DATA SEGMENT HEADER - UNLIMITED |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
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DATA SEGMENT HEADER - UNLIMITED |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
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DATA SEGMENT HEADER - UNLIMITED |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
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Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
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Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
Data Block |
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