page 0:file header
page 1:1st PFS(page free space)
page 2:1st GAM
page 3:1st SGAM
page 4及page 5:unused
page 6:1st DCM(differential changed map)
page 7:1st BCM(bulk changed map),也称为ML mapping page
上述内容恰好占掉数据文件的第一个extent。
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