继续更新一次看看，又重复了上面的步骤，
提升了 物理位置
Block header dump: 0x00c007a3
Object id on Block? Y
seg/obj: 0x66b7 csc: 0x00.1891b98 itc: 1 flg: O typ: 1 - DATA
fsl: 0 fnx: 0x0 ver: 0x01
Itl Xid Uba Flag Lck Scn/Fsc
0x01 xid: 0x0006.044.000000f2 uba: 0x00801660.00da.0f --U- 2 fsc 0x0000.01891b99
data_block_dump
===============
tsiz: 0x1fb8
hsiz: 0x28
pbl: 0x0ba76c44
bdba: 0x00c007a3
flag=-----------
ntab=1
nrow=11
frre=7
fsbo=0x28
fseo=0x1de0
avsp=0x1e0a
tosp=0x1e0a
0xe:pti[0] nrow=11 offs=0
0x12:pri[0] offs=0x1efa
0x14:pri[1] offs=0x1f0d
0x16:pri[2] offs=0x1f20
0x18:pri[3] offs=0x1f33
0x1a:pri[4] offs=0x1f46
0x1c:pri[5] offs=0x1f59
0x1e:pri[6] offs=0x1e57 -------发生变化
0x20:pri[7] sfll=-1
0x22:pri[8] offs=0x1f92
0x24:pri[9] offs=0x1fa5
0x26:pri[10] offs=0x1de0 ------ 发生变化
block_row_dump:
tab 0, row 0, @0x1efa
tl: 19 fb: --H-FL-- lb: 0x0 cc: 2
col 0: [ 2] c1 02
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
tab 0, row 1, @0x1f0d
tl: 19 fb: --H-FL-- lb: 0x0 cc: 2
col 0: [ 2] c1 03
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
tab 0, row 2, @0x1f20
tl: 19 fb: --H-FL-- lb: 0x0 cc: 2
col 0: [ 2] c1 04
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
tab 0, row 3, @0x1f33
tl: 19 fb: --H-FL-- lb: 0x0 cc: 2
col 0: [ 2] c1 05
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
tab 0, row 4, @0x1f46
tl: 19 fb: --H-FL-- lb: 0x0 cc: 2
col 0: [ 2] c1 06
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
tab 0, row 5, @0x1f59
tl: 19 fb: --H-FL-- lb: 0x0 cc: 2
col 0: [ 2] c1 07
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
tab 0, row 6, @0x1e57
tl: 119 fb: --H-FL-- lb: 0x1 cc: 2
col 0: [ 2] c1 14
col 1: [112] ---------------数据长度大大增加
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71
tab 0, row 8, @0x1f92
tl: 19 fb: --H-FL-- lb: 0x0 cc: 2
col 0: [ 2] c1 0a
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
tab 0, row 9, @0x1fa5
tl: 19 fb: --H-FL-- lb: 0x0 cc: 2
col 0: [ 2] c1 0b
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
tab 0, row 10, @0x1de0
tl: 119 fb: --H-FL-- lb: 0x1 cc: 2
col 0: [ 2] c1 14
col 1: [112] ---------------数据长度大大增加
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71
end_of_block_dump
End dump data blocks tsn: 2 file#: 3 minblk 1955 maxblk 1955
SQL> alter table tn add ( c varchar2(30));
Table altered.
SQL> alter system dump datafile 3 block 1955;
System altered.
给表增加一个字段，我们发现数据没有变化
Block header dump: 0x00c007a3
Object id on Block? Y
seg/obj: 0x66b7 csc: 0x00.1891b98 itc: 1 flg: O typ: 1 - DATA
fsl: 0 fnx: 0x0 ver: 0x01
Itl Xid Uba Flag Lck Scn/Fsc
0x01 xid: 0x0006.044.000000f2 uba: 0x00801660.00da.0f --U- 2 fsc 0x0000.01891b99
data_block_dump
===============
tsiz: 0x1fb8
hsiz: 0x28
pbl: 0x0ba76c44
bdba: 0x00c007a3
flag=-----------
ntab=1
nrow=11
frre=7
fsbo=0x28
fseo=0x1de0
avsp=0x1e0a
tosp=0x1e0a
0xe:pti[0] nrow=11 offs=0
0x12:pri[0] offs=0x1efa
0x14:pri[1] offs=0x1f0d
0x16:pri[2] offs=0x1f20
0x18:pri[3] offs=0x1f33
0x1a:pri[4] offs=0x1f46
0x1c:pri[5] offs=0x1f59
0x1e:pri[6] offs=0x1e57
0x20:pri[7] sfll=-1
0x22:pri[8] offs=0x1f92
0x24:pri[9] offs=0x1fa5
0x26:pri[10] offs=0x1de0
block_row_dump:
tab 0, row 0, @0x1efa
tl: 19 fb: --H-FL-- lb: 0x0 cc: 2
col 0: [ 2] c1 02
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
tab 0, row 1, @0x1f0d
tl: 19 fb: --H-FL-- lb: 0x0 cc: 2
col 0: [ 2] c1 03
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
tab 0, row 2, @0x1f20
tl: 19 fb: --H-FL-- lb: 0x0 cc: 2
col 0: [ 2] c1 04
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
tab 0, row 3, @0x1f33
tl: 19 fb: --H-FL-- lb: 0x0 cc: 2
col 0: [ 2] c1 05
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
tab 0, row 4, @0x1f46
tl: 19 fb: --H-FL-- lb: 0x0 cc: 2
col 0: [ 2] c1 06
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
tab 0, row 5, @0x1f59
tl: 19 fb: --H-FL-- lb: 0x0 cc: 2
col 0: [ 2] c1 07
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
tab 0, row 6, @0x1e57
tl: 119 fb: --H-FL-- lb: 0x1 cc: 2
col 0: [ 2] c1 14
col 1: [112]
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71
tab 0, row 8, @0x1f92
tl: 19 fb: --H-FL-- lb: 0x0 cc: 2
col 0: [ 2] c1 0a
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
tab 0, row 9, @0x1fa5
tl: 19 fb: --H-FL-- lb: 0x0 cc: 2
col 0: [ 2] c1 0b
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
tab 0, row 10, @0x1de0
tl: 119 fb: --H-FL-- lb: 0x1 cc: 2
col 0: [ 2] c1 14
col 1: [112]
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71
end_of_block_dump
End dump data blocks tsn: 2 file#: 3 minblk 1955 maxblk 1955
SQL> update tn set c = 'p';
10 rows updated.
SQL> commit;
Commit complete.
SQL> alter system dump datafile 3 block 1955;
System altered.
更新增加的字段，我们发现所有的行都被提升了物理位置
Block header dump: 0x00c007a3
Object id on Block? Y
seg/obj: 0x66b7 csc: 0x00.1891b9c itc: 1 flg: O typ: 1 - DATA
fsl: 0 fnx: 0x0 ver: 0x01
Itl Xid Uba Flag Lck Scn/Fsc
0x01 xid: 0x0001.00a.000000e8 uba: 0x00803494.0147.11 --U- 10 fsc 0x0000.01891b9e
data_block_dump
===============
tsiz: 0x1fb8
hsiz: 0x28
pbl: 0x0ba76c44
bdba: 0x00c007a3
flag=-----------
ntab=1
nrow=11
frre=7
fsbo=0x28
fseo=0x1c46
avsp=0x1df6
tosp=0x1df6
0xe:pti[0] nrow=11 offs=0
0x12:pri[0] offs=0x1dcb ---------所有行的物理位置都发生了变化,因为原来的位置装不下多出来的数据了
0x14:pri[1] offs=0x1db6
0x16:pri[2] offs=0x1da1
0x18:pri[3] offs=0x1d8c
0x1a:pri[4] offs=0x1d77
0x1c:pri[5] offs=0x1d62
0x1e:pri[6] offs=0x1ce9
0x20:pri[7] sfll=-1
0x22:pri[8] offs=0x1cd4
0x24:pri[9] offs=0x1cbf
0x26:pri[10] offs=0x1c46
block_row_dump:
tab 0, row 0, @0x1dcb
tl: 21 fb: --H-FL-- lb: 0x1 cc: 3
col 0: [ 2] c1 02
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
col 2: [ 1] 70
tab 0, row 1, @0x1db6
tl: 21 fb: --H-FL-- lb: 0x1 cc: 3
col 0: [ 2] c1 03
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
col 2: [ 1] 70
tab 0, row 2, @0x1da1
tl: 21 fb: --H-FL-- lb: 0x1 cc: 3
col 0: [ 2] c1 04
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
col 2: [ 1] 70
tab 0, row 3, @0x1d8c
tl: 21 fb: --H-FL-- lb: 0x1 cc: 3
col 0: [ 2] c1 05
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
col 2: [ 1] 70
tab 0, row 4, @0x1d77
tl: 21 fb: --H-FL-- lb: 0x1 cc: 3
col 0: [ 2] c1 06
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
col 2: [ 1] 70
tab 0, row 5, @0x1d62
tl: 21 fb: --H-FL-- lb: 0x1 cc: 3
col 0: [ 2] c1 07
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
col 2: [ 1] 70
tab 0, row 6, @0x1ce9
tl: 121 fb: --H-FL-- lb: 0x1 cc: 3
col 0: [ 2] c1 14
col 1: [112]
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71
col 2: [ 1] 70
tab 0, row 8, @0x1cd4
tl: 21 fb: --H-FL-- lb: 0x1 cc: 3
col 0: [ 2] c1 0a
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
col 2: [ 1] 70
tab 0, row 9, @0x1cbf
tl: 21 fb: --H-FL-- lb: 0x1 cc: 3
col 0: [ 2] c1 0b
col 1: [12] 77 77 77 65 65 65 72 72 72 74 74 74
col 2: [ 1] 70
tab 0, row 10, @0x1c46
tl: 121 fb: --H-FL-- lb: 0x1 cc: 3
col 0: [ 2] c1 14
col 1: [112]
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71 71
71 71 71 71 71 71 71 71 71 71 71 71
col 2: [ 1] 70
end_of_block_dump
End dump data blocks tsn: 2 file#: 3 minblk 1955 maxblk 1955
right">（出处：清风软件下载学院）
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