Block dump from cache:
Dump of buffer cache at level 4 for tsn=7 rdba=29360257
Block dump from disk:
buffer tsn: 7 rdba: 0x01c00081 (7/129)
scn: 0x0000.0082b04b seq: 0x03 flg: 0x04 tail: 0xb04b2103
frmt: 0x02 chkval: 0xcf4e type: 0x21=SECOND LEVEL BITMAP BLOCK --L2
Hex dump of block: st=0, typ_found=1
Dump of memory from 0xB6B43600 to 0xB6B45600
B6B43600 0000A221 01C00081 0082B04B 04030000 [!.......K.......] 0000A221中21与type: 0x21= 对应
Repeat 496 times
B6B455F0 00000000 00000000 00000000 B04B2103 [.............!K.]
Dump of Second Level Bitmap Block
number: 12 nfree: 12 ffree: 0 pdba: 0x01c00082 --父DBA，也就是L3的地址-130号块， number: 12 --L1的总数，nfree: 12--空闲的L1个数，
Inc #: 0 Objd: 23199
opcode:1
xid:
L1 Ranges :--多个L1时，按L1 DBA顺序插入///// 插入数据时：再根据PID进行HASH，得到一个随机值，根据此值选择L2中的L1--受高水位影响的
--------------------------------------------------------
0x01c00080 Free: 5 Inst: 1 ---128号块，Free: 5标记L1中可用空间状态
0x01c00090 Free: 5 Inst: 1 --144号块，Free: 0 FULL状态
0x01c000a0 Free: 5 Inst: 1
0x01c000b0 Free: 5 Inst: 1
0x01c000c0 Free: 5 Inst: 1
0x01c000d0 Free: 5 Inst: 1
0x01c000e0 Free: 5 Inst: 1
0x01c000f0 Free: 5 Inst: 1
0x01c00100 Free: 5 Inst: 1
0x01c00101 Free: 5 Inst: 1
0x01c00180 Free: 5 Inst: 1
0x01c00181 Free: 5 Inst: 1
--------------------------------------------------------
End dump data blocks tsn: 7 file#: 7 minblk 129 maxblk 129
#####################################
DUMP L3块--根据L2中的 L1 Ranges的找到 第一个L1块的DBA
BYS@ bys3>alter system dump datafile 7 block 128;System altered.
BYS@ bys3>select value from v$diag_info where name like 'De%';
VALUE
----------------------------------------------------------------------------------------------------
/u01/diag/rdbms/bys3/bys3/trace/bys3_ora_5162.trc
@@@@@@@@@@@@@@@
Block dump from cache:
Dump of buffer cache at level 4 for tsn=7 rdba=29360256
Block dump from disk:
buffer tsn: 7 rdba: 0x01c00080 (7/128)
scn: 0x0000.0082afe2 seq: 0x01 flg: 0x04 tail: 0xafe22001
frmt: 0x02 chkval: 0x9d2d type: 0x20=FIRST LEVEL BITMAP BLOCK
Hex dump of block: st=0, typ_found=1
Dump of memory from 0xB6CBD600 to 0xB6CBF600
B6CBD600 0000A220 01C00080 0082AFE2 04010000 [ ...............] 0000A220的20，表示：type: 0x20=FIRST LEVEL BITMAP BLOCK
B6CBD610 00009D2D 00000000 00000000 00000000 [-...............]
B6CBD620 00000000 00000000 00000000 00000000 [................]
Repeat 1 times
Repeat 8 times
B6CBD780 00000000 00000000 00000000 55551511 [..............UU]
B6CBD790 00000000 00000000 00000000 00000000 [................]
Repeat 485 times
B6CBF5F0 00000000 00000000 00000000 AFE22001 [............. ..]
Dump of First Level Bitmap Block
--------------------------------
nbits : 4 nranges: 2 parent dba: 0x01c00081 poffset: 0 --parent dba: 上一级DBA，L2的地址——129号块
unformatted: 8 total: 16 first useful block: 3
owning instance : 1
instance ownership changed at 01/22/2014 11:22:40
Last successful Search 01/22/2014 11:22:40
Freeness Status: nf1 0 nf2 0 nf3 0 nf4 5
Extent Map Block Offset: 4294967295
First free datablock : 3
Bitmap block lock opcode 0
Locker xid: : 0x0000.000.00000000
Dealloc scn: 3.0
Flag: 0x00000001 (-/-/-/-/-/HWM)
Inc #: 0 Objd: 23199
HWM Flag: HWM Set
Highwater:: 0x01c00088 ext#: 0 blk#: 8 ext size: 8 高水位在 0x01c00088 136号块，下一个区的第一个块
#blocks in seg. hdr's freelists: 0
#blocks below: 5
ma