11G版本
BBED> print kcvfh
struct kcvfh, 860 bytes @0
struct kcvfhbfh, 20 bytes @0
ub1 type_kcbh @0 0x0b
ub1 frmt_kcbh @1 0xa2
ub1 spare1_kcbh @2 0x00
ub1 spare2_kcbh @3 0x00
ub4 rdba_kcbh @4 0x0dc00001 --这四个字节表示块地址即RDBA
ub4 bas_kcbh @8 0x00000000 --这4个字节表示块的scn低4位
ub2 wrp_kcbh @12 0x0000 --这4个字节表示块的scn高4位
ub1 seq_kcbh @14 0x01
ub1 flg_kcbh @15 0x04 (KCBHFCKV) 这个字节是块的flg 1 = virgin block 2 = last change to the block was for a cleanout operation
4 = checksum value is set 8 = temporary data
这是一个可以组合的值 也就是说有为 6 的时候是
ub2 chkval_kcbh @16 0xd675 --块的校验值
ub2 spare3_kcbh @18 0x0000
struct kcvfhhdr, 76 bytes @20
ub4 kccfhswv @20 0x00000000
ub4 kccfhcvn @24 0x0b200000
ub4 kccfhdbi @28 0xff6cdb51 --0028――0031 4个字节存储DBID
text kccfhdbn[0] @32 D --这个8个bytes存放的是数据库名的ascii码表示
text kccfhdbn[1] @33 B
text kccfhdbn[2] @34 S
text kccfhdbn[3] @35 E
text kccfhdbn[4] @36 R
text kccfhdbn[5] @37 V
text kccfhdbn[6] @38 E
text kccfhdbn[7] @39 R
ub4 kccfhcsq @40 0x002105b0 --这4个字节存放的是Control Seq
ub4 kccfhfsz @44 0x0015b048 --这四个字节存放的是文件当前所包含的块数
s_blkz kccfhbsz @48 0x00 --这四个字节存放的是文件的块大小
ub2 kccfhfno @52 0x0037 --这两个字节存放的是文件号
ub2 kccfhtyp @54 0x0003 --这两个字节存放的是文件的类型，03表示为数据文件,06表示为undo文件
ub4 kccfhacid @56 0x00000000
ub4 kccfhcks @60 0x00000000
text kccfhtag[0] @64
text kccfhtag[1] @65
text kccfhtag[2] @66
text kccfhtag[3] @67
text kccfhtag[4] @68
text kccfhtag[5] @69
text kccfhtag[6] @70
text kccfhtag[7] @71
text kccfhtag[8] @72
text kccfhtag[9] @73
text kccfhtag[10] @74
text kccfhtag[11] @75
text kccfhtag[12] @76
text kccfhtag[13] @77
text kccfhtag[14] @78
text kccfhtag[15] @79
text kccfhtag[16] @80
text kccfhtag[17] @81
text kccfhtag[18] @82
text kccfhtag[19] @83
text kccfhtag[20] @84
text kccfhtag[21] @85
text kccfhtag[22] @86
text kccfhtag[23] @87
text kccfhtag[24] @88
text kccfhtag[25] @89
text kccfhtag[26] @90
text kccfhtag[27] @91
text kccfhtag[28] @92
text kccfhtag[29] @93
text kccfhtag[30] @94
text kccfhtag[31] @95
ub4 kcvfhrdb @96 0x00000000 --root dba
struct kcvfhcrs, 8 bytes @100
ub4 kscnbas @100 0x0d25a596 -- 这4个字节存放的是该文件所属表空间创建时的scn 的低四位 v$datafile.CREATION_CHANGE#
ub2 kscnwrp @104 0x0000
ub4 kcvfhcrt @108 0x2db6e34e
ub4 kcvfhrlc @112 0x2d7c2354 --这四个字节存放的是reset logs count
struct kcvfhrls, 8 bytes @116
ub4 kscnbas @116 0x000e6c20 --这4个字节存放的是reset logs scn，原来在数据文件头中也记录了上次的resetlog的scn
ub2 kscnwrp @120 0x0000
ub4 kcvfhbti @124 0x00000000
struct kcvfhbsc, 8 bytes @128
ub4 kscnbas @128 0x00000000 --这4个字节存放的是Backup taken scn
ub2 kscnwrp @132 0x0000
ub2 kcvfhbth @136 0x0000
ub2 kcvfhsta @138 0x0004 (KCVFHOFZ) --这个字节表示数据文件状态，04应该为正常，00是关闭，01是begin backup
struct kcvfhckp, 36 bytes @484
struct kcvcpscn, 8 bytes @484
ub4 kscnbas @484 0x8940c638 --SCN of last change to the datafile. 低四位
ub2 kscnwrp @488 0x0841 --高四位
ub4 kcvcptim @492 0x2eac2488 --Time of the last change to the datafile
ub2 kcvcpthr @496 0x0001 --这个字节表示应该是写resetlogs的thread号
union u, 12 bytes @500
struct kcvcprba, 12 bytes @500
ub4 kcrbaseq @500 0x000020f2 --这三个字节存放的RBA sequence号码
ub4 kcrbabno @504 0x00000002 --block号
ub2 kcrbabof @508 0x0010 --偏移量
ub1 kcvcpetb[0] @512 0x02
ub1 kcvcpetb[1] @513 0x00
ub1 kcvcpetb[2] @514 0x00
ub1 kcvcpetb[3] @515 0x00
ub1 kcvcpetb[4] @516 0x00
ub1 kcvcpetb[5] @517 0x00
ub1 kcvcpetb[6] @518 0x00
ub1 kcvcpetb[7] @519 0x00
ub4 kcvfhcpc @140 0x00001191 --这四个字节表示数据文件发生checkpoint次数
ub4 kcvfhrts @144 0x00000000
ub4 kcvfhccc @148 0x00001190 --这两个字节表示数据文件ctl cnt Unknown, but is always 1 less than thecheckpoint point count.
struct kcvfhbcp, 36 bytes @152
struct kcvcpscn, 8 bytes @152
ub4 kscnbas @152 0x00000000
ub2 kscnwrp @156 0x0000
ub4 kcvcptim @160 0x00000000
ub2 kcvcpthr @164 0x0000
union u, 12 bytes @168
struct kcvcprba, 12 bytes @168
ub4 kcrbaseq @168 0x00000000
ub4 kcrbabno @172 0x00000000
ub2 kcrbabof @176 0x0000
ub1 kcvcpetb[0] @180 0x00
ub1 kcvcpetb[1] @181 0x00
ub1 kcvcpetb[2] @182 0x00
ub1 kcvcpetb[3] @183 0x00
ub1 kcvcpetb[4] @184 0x00
ub1 kcvcpetb[5] @185 0x00
ub1 kcvcpetb[6] @186 0x00
ub1 kcvcpetb[7] @187 0x00
ub4 kcvfhbhz @312 0x00000000
struct kcvfhxcd, 16 bytes @316
ub4 space_kcvmxcd[0] @316 0x00000000
ub4 space_kcvmxcd[1] @320 0x00000000
ub4 space_kcvmxcd[2] @324 0x00000000
ub4 space_kcvmxcd[3] @328 0x00000000
sword kcvfhtsn @332 23 --这个字节存放的是该文件所属tablespace号
ub2 kcvfhtln @336 0x0008
text kcvfhtnm[0] @338 H --这几个字节存放的是tablespace名的ascii表示。
text kcvfhtnm[1] @339 I
text kcvfhtnm[2] @340 S
text kcvfhtnm[3] @341 _
text kcvfhtnm[4] @342 D
text kcvfhtnm[5] @343 A
text kcvfhtnm[6] @344 T
text kcvfhtnm[7] @345 A
text kcvfhtnm[8] @346
text kcvfhtnm[9] @347
text kcvfhtnm[10] @348
text kcvfhtnm[11] @349
text kcvfhtnm[12] @350
text kcvfhtnm[13] @351
text kcvfhtnm[14] @352
text kcvfhtnm[15] @353
text kcvfhtnm[16] @354
text kcvfhtnm[17] @355
text kcvfhtnm[18] @356
text kcvfhtnm[19] @357
text kcvfhtnm[20] @358
text kcvfhtnm[21] @359
text kcvfhtnm[22] @360
text kcvfhtnm[23] @361
text kcvfhtnm[24] @362
text kcvfhtnm[25] @363
text kcvfhtnm[26] @364
text kcvfhtnm[27] @365
text kcvfhtnm[28] @366
text kcvfhtnm[29] @367
ub4 kcvfhrfn @368 0x00000037
struct kcvfhrfs, 8 bytes @372
ub4 kscnbas @372 0x00000000
ub2 kscnwrp @376 0x0000
ub4 kcvfhrft @380 0x00000000
struct kcvfhafs, 8 bytes @384
ub4 kscnbas @384 0x00000000
ub2 kscnwrp @388 0x0000
ub4 kcvfhbbc @392 0x00000000
ub4 kcvfhncb @396 0x00000000
ub4 kcvfhmcb @400 0x00000000
ub4 kcvfhlcb @404 0x00000000
ub4 kcvfhbcs @408 0x00000000
ub2 kcvfhofb @412 0x0000
ub2 kcvfhnfb @414 0x0000
ub4 kcvfhprc @416 0x296b946b --这四个字节存放的是prev reset logs count
struct kcvfhprs, 8 bytes @420
ub4 kscnbas @420 0x00000001 --这4个字节存放的是prev reset logs scn
ub2 kscnwrp @424 0x0000
struct kcvfhprfs, 8 bytes @428
ub4 kscnbas @428 0x00000000
ub2 kscnwrp @432 0x0000
ub4 kcvfhtrt @444 0x00000000
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