Last Level 1 BMB: 0x01000101
Last Level II BMB: 0x010000a9
Last Level III BMB: 0x00000000
Map Header:: next 0x00000000 #extents: 17 obj#: 22989 flag: 0x10000000
Inc # 0
Extent Map
-----------------------------------------------------------------
0x010000a8 length: 8 --第一个区的起始地址是0x010000a8，四号文件，168号块。
0x010000b0 length: 8 --第二个区的起始地址是0x010000b0，4号文件176号块，与高水位的对应
0x010000b8 length: 8
0x010000c0 length: 8
0x010000c8 length: 8
0x010000d0 length: 8
0x010000d8 length: 8
0x010000e0 length: 8
0x010000e8 length: 8
0x010000f0 length: 8
0x010001a8 length: 8
0x010001b0 length: 8
0x010001b8 length: 8
0x010001c0 length: 8
0x010001c8 length: 8
0x010001d0 length: 8
0x01000100 length: 128
Auxillary Map
--------------------------------------------------------
Extent 0 : L1 dba: 0x010000a8 Data dba: 0x010000ab ---这里从L1 DBA可以看到，这一个L1管理了0和1号区。
Extent 1 : L1 dba: 0x010000a8 Data dba: 0x010000b0
Extent 2 : L1 dba: 0x010000b8 Data dba: 0x010000b9
Extent 3 : L1 dba: 0x010000b8 Data dba: 0x010000c0
Extent 4 : L1 dba: 0x010000c8 Data dba: 0x010000c9
Extent 5 : L1 dba: 0x010000c8 Data dba: 0x010000d0
Extent 6 : L1 dba: 0x010000d8 Data dba: 0x010000d9
Extent 7 : L1 dba: 0x010000d8 Data dba: 0x010000e0
Extent 8 : L1 dba: 0x010000e8 Data dba: 0x010000e9
Extent 9 : L1 dba: 0x010000e8 Data dba: 0x010000f0
Extent 10 : L1 dba: 0x010001a8 Data dba: 0x010001a9
Extent 11 : L1 dba: 0x010001a8 Data dba: 0x010001b0
Extent 12 : L1 dba: 0x010001b8 Data dba: 0x010001b9
Extent 13 : L1 dba: 0x010001b8 Data dba: 0x010001c0
Extent 14 : L1 dba: 0x010001c8 Data dba: 0x010001c9
Extent 15 : L1 dba: 0x010001c8 Data dba: 0x010001d0
--------------------------------------------------------
Second Level Bitmap block DBAs
--------------------------------------------------------
DBA 1: 0x010000a9
##############################################
DUMP 第一个L1--也是高水位内的惟一一个L1
BYS@ bys3>alter system dump datafile 4 block 168;System altered.
BYS@ bys3>select value from v$diag_info where name like 'De%';
VALUE
----------------------------------------------------------------------------------------------------
/u01/diag/rdbms/bys3/bys3/trace/bys3_ora_27244.trc
###############DUMP信息如下：
Dump of First Level Bitmap Block
--------------------------------
nbits : 4 nranges: 2 parent dba: 0x010000a9 poffset: 0
unformatted: 8 total: 16 first useful block: 3
owning instance : 1
instance ownership changed at 01/25/2014 22:21:43
Last successful Search 01/25/2014 22:21:43
Freeness Status: nf1 0 nf2 0 nf3 0 nf4 5
Extent Map Block Offset: 4294967295
First free datablock : 3
Bitmap block lock opcode 3
Locker xid: : 0x0003.006.00001365
Dealloc scn: 8820451.0
Flag: 0x00000001 (-/-/-/-/-/HWM)
Inc #: 0 Objd: 22989
HWM Flag: HWM Set
Highwater:: 0x010000b0 ext#: 0 blk#: 8 ext size: 8
#blocks in seg. hdr's freelists: 0
#blocks below: 5
mapblk 0x00000000 offset: 0
--------------------------------------------------------
DBA Ranges : ---从这里也能验证这个L1管理了两个区，与段头的 Auxillary Map可以对应。
--------------------------------------------------------
0x010000a8 Length: 8 Offset: 0
0x010000b0 Length: 8 Offset: 8
0:Metadata 1:Metadata 2:Metadata 3:75-100% free
4:75-100% free 5:75-100% free 6:75-100% free 7:75-100% free
8:unformatted 9:unformatted 10:unformatted 11:unformatted
12:unformatted 13:unformatted