Oracle 10g 数据文件的第一个数据块结构

时间：2022-03-08 13:23:36

一.数据文件的第一个数据块结构kcvfh

BBED> set file 1

        FILE#           1

BBED> set block 1

        BLOCK#          1

--查看第一个数据块的整体结构

BBED> map /v

 File: /u01/app/oracle/oradata/ORCL/datafile/o1_mf_system_bc7ld3sf_.dbf (1)

 Block: 1                                     Dba:0x00400001

------------------------------------------------------------

 Data File Header

 struct kcvfh, 676 bytes                    @0

    struct kcvfhbfh, 20 bytes               @0

    struct kcvfhhdr, 76 bytes               @20

    ub4 kcvfhrdb                            @96

    struct kcvfhcrs, 8 bytes                @100

    ub4 kcvfhcrt                            @108

    ub4 kcvfhrlc                            @112

    struct kcvfhrls, 8 bytes                @116

    ub4 kcvfhbti                            @124

    struct kcvfhbsc, 8 bytes                @128

    ub2 kcvfhbth                            @136

    ub2 kcvfhsta                            @138

    struct kcvfhckp, 36 bytes               @484

    ub4 kcvfhcpc                            @140

    ub4 kcvfhrts                            @144

    ub4 kcvfhccc                            @148

    struct kcvfhbcp, 36 bytes               @152

    ub4 kcvfhbhz                            @312

    struct kcvfhxcd, 16 bytes               @316

    word kcvfhtsn                           @332

    ub2 kcvfhtln                            @336

    text kcvfhtnm[30]                       @338

    ub4 kcvfhrfn                            @368

    struct kcvfhrfs, 8 bytes                @372

    ub4 kcvfhrft                            @380

    struct kcvfhafs, 8 bytes                @384

    ub4 kcvfhbbc                            @392

    ub4 kcvfhncb                            @396

    ub4 kcvfhmcb                            @400

    ub4 kcvfhlcb                            @404

    ub4 kcvfhbcs                            @408

    ub2 kcvfhofb                            @412

    ub2 kcvfhnfb                            @414

    ub4 kcvfhprc                            @416

    struct kcvfhprs, 8 bytes                @420

    struct kcvfhprfs, 8 bytes               @428

    ub4 kcvfhtrt                            @444     

 ub4 tailchk                                @8188    

BBED>
--print结构 kcvfh

BBED> print kcvfh

struct kcvfh, 676 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        0x00400001

      ub4 bas_kcbh                          @8        0x00000000

      ub2 wrp_kcbh                          @12       0x0000

      ub1 seq_kcbh                          @14       0x01

      ub1 flg_kcbh                          @15       0x04 (KCBHFCKV)

      ub2 chkval_kcbh                       @16       0xd5f6

      ub2 spare3_kcbh                       @18       0x0000

   struct kcvfhhdr, 76 bytes                @20

      ub4 kccfhswv                          @20       0x00000000

      ub4 kccfhcvn                          @24       0x0a200100

      ub4 kccfhdbi                          @28       0x533ddaa4

      text kccfhdbn[0]                      @32      O

      text kccfhdbn[1]                      @33      R

      text kccfhdbn[2]                      @34      C

      text kccfhdbn[3]                      @35      L

      text kccfhdbn[4]                      @36

      text kccfhdbn[5]                      @37

      text kccfhdbn[6]                      @38

      text kccfhdbn[7]                      @39

      ub4 kccfhcsq                          @40       0x0000022d

      ub4 kccfhfsz                          @44       0x0000f000

      s_blkz kccfhbsz                       @48       0x00

      ub2 kccfhfno                          @52       0x0001

      ub2 kccfhtyp                          @54       0x0003

      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       0x00400179

   struct kcvfhcrs, 8 bytes                 @100

      ub4 kscnbas                           @100      0x00000005

      ub2 kscnwrp                           @104      0x0000

   ub4 kcvfhcrt                             @108      0x33c88f35

   ub4 kcvfhrlc                             @112      0x33cecf37

   struct kcvfhrls, 8 bytes                 @116

      ub4 kscnbas                           @116      0x00073e32

      ub2 kscnwrp                           @120      0x0000

   ub4 kcvfhbti                             @124      0x00000000

   struct kcvfhbsc, 8 bytes                 @128

      ub4 kscnbas                           @128      0x00000000

      ub2 kscnwrp                           @132      0x0000

   ub2 kcvfhbth                             @136      0x0000

   ub2 kcvfhsta                             @138      0x2004 (KCVFHOFZ)

   struct kcvfhckp, 36 bytes                @484

      struct kcvcpscn, 8 bytes              @484

         ub4 kscnbas                        @484      0x00073e33

         ub2 kscnwrp                        @488      0x0000

      ub4 kcvcptim                          @492      0x33cecf3e

      ub2 kcvcpthr                          @496      0x0001

      union u, 12 bytes                     @500

         struct kcvcprba, 12 bytes          @500

            ub4 kcrbaseq                    @500      0x00000001

            ub4 kcrbabno                    @504      0x00000002

            ub2 kcrbabof                    @508      0x0010

      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      0x00000043

   ub4 kcvfhrts                             @144      0x33cecf1e

   ub4 kcvfhccc                             @148      0x00000042

   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

   word kcvfhtsn                            @332      0

   ub2 kcvfhtln                             @336      0x0006

   text kcvfhtnm[0]                         @338     S

   text kcvfhtnm[1]                         @339     Y

   text kcvfhtnm[2]                         @340     S

   text kcvfhtnm[3]                         @341     T

   text kcvfhtnm[4]                         @342     E

   text kcvfhtnm[5]                         @343     M

   text kcvfhtnm[6]                         @344

   text kcvfhtnm[7]                         @345

   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      0x00000001

   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      0x000a

   ub2 kcvfhnfb                             @414      0x000a

   ub4 kcvfhprc                             @416      0x33ce5d9c

   struct kcvfhprs, 8 bytes                 @420

      ub4 kscnbas                           @420      0x0006ca36

      ub2 kscnwrp                           @424      0x0000

   struct kcvfhprfs, 8 bytes                @428

      ub4 kscnbas                           @428      0x00000000

      ub2 kscnwrp                           @432      0x0000

   ub4 kcvfhtrt                             @444      0x00000000

BBED>

注，print出的值可能是不完整的，如果想查看详细的值，最好用dump

二.数据字典X$KCVFH

　　X$KCVFH（参考dbsnake博客）的值与kcvfh是相对应的

序号

Column Name

Description

1

ADDR RAW(4)

ADDRESS

2

INDX NUMBER

INDEX

3

INST_ID NUMBER

INSTANCE ID

4

HXFIL NUMBER

FILE#，Datafile number (from control file)

5

HXONS NUMBER

ONLINE | OFFLINE (from control file),HXONS为 0表示 ‘OFFLINE’,为其他值表示 ‘ONLINE’

6

HXSTS VARCHAR2(16)

  

7

HXERR NUMBER

ERROR，decode(HXERR, 0, NULL, 1,’FILE MISSING’,2,’OFFLINE NORMAL’, 3,’NOT VERIFIED’, 4,’FILE NOT FOUND’,5,’CANNOT OPEN FILE’, 6,’CANNOT READ HEADER’, 7,’CORRUPT HEADER’,8,’WRONG FILE TYPE’, 9,’WRONG DATABASE’, 10,’WRONG FILE NUMBER’,11,’WRONG FILE CREATE’, 12,’WRONG FILE CREATE’, 16,’DELAYED OPEN’,14, ‘WRONG RESETLOGS’, 15,’OLD CONTROLFILE’, ‘UNKNOWN ERROR’)

8

HXVER NUMBER

FORMAT，Indicates the format for the header block. The possible values are 6, 7, 8, or 0. 6  - indicates Oracle Version 6；7 – indicates Oracle Version 7；8 – indicates Oracle Version 8；0  - indicates the format could not be determined (for example, the header could not be read)

9

FHSWV NUMBER

  

10

FHCVN NUMBER

Compatibility Vsn

11

FHDBI NUMBER

DBID

12

FHDBN VARCHAR2(9)

DB NAME

13

FHCSQ NUMBER

controlfile sequence number

14

FHFSZ NUMBER

BLOCKS, Current datafile size in blocks

15

FHBSZ NUMBER

datafile block size

16

FHFNO NUMBER

Tablespace datafile number

17

FHTYP NUMBER

Type:

1 control file

2 redo log file

3 vanilla db file; that is, normal data, index, and undo blocks

4 backup control file

5 backup piece

6 temporary db file

18

FHRDB NUMBER

Root dba: This field only occurs in data file #1, and is the location of blocks required during bootstrapping the data dictionary (bootstrap$)

19

FHCRS VARCHAR2(16)

CREATION_CHANGE#，Datafile creation change#

20

FHCRT VARCHAR2(20)

CREATION_TIME，Datafile creation timestamp

21

FHRLC VARCHAR2(20)

RESETLOGS_TIME, Resetlogs timestamp

22

FHRLC_I NUMBER

reset logs count

23

FHRLS VARCHAR2(16)

RESETLOGS_CHANGE#, Resetlogs change#

24

FHPRC VARCHAR2(20)

prev reset logs timestamp

25

FHPRC_I NUMBER

prev reset logs count

26

FHPRS VARCHAR2(16)

prev reset logs SCN

27

FHBTI VARCHAR2(20)

Time the backup started, Updated when executing BEGIN BACKUP on the tablespace. RMAN does not update this field.

28

FHBSC VARCHAR2(16)

System change number when backup started, Updated when executing BEGIN BACKUP on the tablespace. RMAN does not update this field.

29

FHBTH NUMBER

Thread when when backup started, Updated when executing BEGIN BACKUP on the tablespace. RMAN does not update this field.

30

FHSTA NUMBER

The value for the column X$KCVFH.FHSTA (file header status) for an open database with an online datafiles in versions prior to version 10 were all 4, indicating an online fuzzy status.  With version 10 of Oracle the first system tablespace datafile will have a different status of 8196 if the datafile is online and the database is open and not in backup mode. In Oracle , the X$KCVFH.FHSTA column will show 8196 for system data file if COMPATIBLE is set to 10.0.0.0 or higher.  The value of 8196 is a value of 0×04, as in previous releases, plus an AND’d value of 0×2000 (8192) for internal uses. If COMPATIBLE is set to 9.2.0 (lowest possible value for Oracle ), the FHSTA column for system datafile will have a value of 4.   In Oracle, the COMPATIBLE value is irreversible if advanced to a higher value. So the value of 8196 for the fhsta (status) column for the first system tablespace datafile is normal.

31

FHSCN VARCHAR2(16)

CHECKPOINT_CHANGE#, Datafile checkpoint change#, Updated on every checkpoint, but not when in Hot backup state (not online backups). This must remain untouched when you are in hot backup mode, because you might get checkpoints between the BEGIN BACKUP and when you actually start the copying process.

32

FHTIM VARCHAR2(20)

CHECKPOINT_TIME, Datafile checkpoint timestamp

33

FHTHR NUMBER

THREAD#

34

FHRBA_SEQ NUMBER

SEQUENCE，即Redo log sequence number

35

FHRBA_BNO NUMBER

Block number，即the redo log file block number

36

FHRBA_BOF NUMBER

Byte offset，the byte offset into the block at which the redo record starts

37

FHETB RAW(132)

enable threads byte，这个我不确定，是猜的。

38

FHCPC NUMBER

CHECKPOINT_COUNT, Datafile checkpoint count

39

FHRTS VARCHAR2(20)

Recoverd timestamp

40

FHCCC NUMBER

Controlfile Checkpoint Count: Saved copy of the control file record of the checkpoint count. Helps detect old control files.

41

FHBCP_SCN VARCHAR2(16)

Backup Checkpoint SCN: Updated with the checkpoint done while file in Hot backup

42

FHBCP_TIM VARCHAR2(20)

Backup Checkpoint TIME: Updated with the checkpoint done while file in Hot backup

43

FHBCP_THR NUMBER

Backup Checkpoint Thread: Updated with the checkpoint done while file in Hot backup

44

FHBCP_RBA_SEQ NUMBER

Backup Checkpoint Sequence, 即Redo log sequence number: Updated with the checkpoint done while file in Hot backup

45

FHBCP_RBA_BNO NUMBER

the redo log file block number, Updated with the checkpoint done while file in Hot backup

46

FHBCP_RBA_BOF NUMBER

Byte offset，the byte offset into the block at which the redo record starts, Updated with the checkpoint done while file in Hot backup

47

FHBCP_ETB RAW(132)

enable threads byte，这个我不确定，是猜的

48

FHBHZ NUMBER

begin hot backup file size

49

FHXCD RAW(16)

External cache id: Used to ensure that concurrent instances access data through consistent external cache

50

FHTSN NUMBER

TS#，Tablespace number

51

FHTNM VARCHAR2(30)

TABLESPACE_NAME, Tablespace name

52

FHRFN NUMBER

RFILE#, Tablespace relative datafile number

53

FHAFS VARCHAR2(16)

absolute fuzzy scn, 即Minimum PITR SCN

54

FHRFS VARCHAR2(16)

The SCN at which the recovery of this file will be complete (no longer fuzzy). Both above fuzzy SCNs must be zero unless a fuzzy flag is set, and must be greater than the checkpoint SCN

55

FHRFT VARCHAR2(20)

The time at which the recovery of this file will be complete (no longer fuzzy).

56

HXIFZ NUMBER

File is fuzzy (YES | NO)，decode(hxifz, 0,’NO’, 1,’YES’, NULL)

57

HXNRCV NUMBER

File needs media recovery (YES | NO)，decode(hxnrcv, 0,’NO’, 1,’YES’,NULL)

58

HXFNM VARCHAR2(513)

NAME, Datafile name

59

FHPOFB NUMBER

  

60

FHPNFB NUMBER

  

61

FHPRE10 NUMBER

  

62

FHFIRSTUNRECSCN VARCHAR2(16)

UNRECOVERABLE_CHANGE#, Last unrecoverable change number made to this datafile. If the database is in ARCHIVELOG mode, then this column is updated when an unrecoverable operation completes. If the database is not in ARCHIVELOG mode, this column does not get updated.

63

FHFIRSTUNRECTIME VARCHAR2(20)

UNRECOVERABLE_TIME, Timestamp of the last unrecoverable change. This column is updated only if the database is in ARCHIVELOG mode.

64

HXLMDBA NUMBER

SPACE_HEADER, The amount of space currently being used and the amount that is free, as identified in the space header. decode(hxlmdba, 0, NULL, hxlmdba)

65

HXLMLD_SCN VARCHAR2(16)

LAST_DEALLOC_SCN, Last deallocated SCN

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