Oracle Controlfile控制文件中记录的信息片段sections

初学Oracle的朋友肯定对Controlfile控制文件中到底记录了何种的信息记录而感到好奇，实际上我们可以通过一个视图v$controlfile_record_section来了解控制文件的信息片段：  

SQL> select type, record_size, records_total from v$controlfile_record_section;

TYPE                         RECORD_SIZE RECORDS_TOTAL
---------------------------- ----------- -------------
DATABASE                             316             1
CKPT PROGRESS                       8180            35
REDO THREAD                          256            32
REDO LOG                              72           192
DATAFILE                             520          1024
FILENAME                             524          4674
TABLESPACE                            68          1024
TEMPORARY FILENAME                    56          1024
RMAN CONFIGURATION                  1108            50
LOG HISTORY                           56           292
OFFLINE RANGE                        200          1063
ARCHIVED LOG                         584           136
BACKUP SET                            40          1227
BACKUP PIECE                         736          1000
BACKUP DATAFILE                      200          1063
BACKUP REDOLOG                        76           430
DATAFILE COPY                        736          1000
BACKUP CORRUPTION                     44          1115
COPY CORRUPTION                       40          1227
DELETED OBJECT                        20           818
PROXY COPY                           928          1004
BACKUP SPFILE                        124           131
DATABASE INCARNATION                  56           292
FLASHBACK LOG                         84          2048
RECOVERY DESTINATION                 180             1
INSTANCE SPACE RESERVATION            28          1055
REMOVABLE RECOVERY FILES              32          1000
RMAN STATUS                          116           141
THREAD INSTANCE NAME MAPPING          80            32
MTTR                                 100            32
DATAFILE HISTORY                     568            57
STANDBY DATABASE MATRIX              400            31
GUARANTEED RESTORE POINT             212          2048
RESTORE POINT                        212          2083
DATABASE BLOCK CORRUPTION             80          8384
ACM OPERATION                        104            64
FOREIGN ARCHIVED LOG                 604          1002

 v$controlfile_record_section 的数据实际来源于X$KCCRS内部表

v$controlfile_record_section 视图的定义 

select inst_id,
       decode(indx,
              0,
              'DATABASE',
              1,
              'CKPT PROGRESS',
              2,
              'REDO THREAD',
              3,
              'REDO LOG',
              4,
              'DATAFILE',
              5,
              'FILENAME',
              6,
              'TABLESPACE',
              7,
              'TEMPORARY FILENAME',
              8,
              'RMAN CONFIGURATION',
              9,
              'LOG HISTORY',
              10,
              'OFFLINE RANGE',
              11,
              'ARCHIVED LOG',
              12,
              'BACKUP SET',
              13,
              'BACKUP PIECE',
              14,
              'BACKUP DATAFILE',
              15,
              'BACKUP REDOLOG',
              16,
              'DATAFILE COPY',
              17,
              'BACKUP CORRUPTION',
              18,
              'COPY CORRUPTION',
              19,
              'DELETED OBJECT',
              20,
              'PROXY COPY',
              21,
              'BACKUP SPFILE',
              23,
              'DATABASE INCARNATION',
              24,
              'FLASHBACK LOG',
              25,
              'RECOVERY DESTINATION',
              26,
              'INSTANCE SPACE RESERVATION',
              27,
              'REMOVABLE RECOVERY FILES',
              28,
              'RMAN STATUS',
              29,
              'THREAD INSTANCE NAME MAPPING',
              30,
              'MTTR',
              31,
              'DATAFILE HISTORY',
              32,
              'STANDBY DATABASE MATRIX',
              33,
              'GUARANTEED RESTORE POINT',
              34,
              'RESTORE POINT',
              35,
              'DATABASE BLOCK CORRUPTION',
              36,
              'ACM OPERATION',
              37,
              'FOREIGN ARCHIVED LOG',
              'UNKNOWN'),
       rsrsz,
       rsnum,
       rsnus,
       rsiol,
       rsilw,
       rsrlw
  from x$kccrs
 where indx not in (22)

  下表罗列出了controlfile 控制文件可能出现的数据库各类文件的记录，如数据文件记录、文件名记录、表空间记录等：  

1. Database Information Record: (1 per database)
2. Checkpoint Progress Record: (1 per thread)
3. Redo Thread Record: (1 per thread)
4. Logfile Record: (1 per logfile)
5. Datafile Record: (1 per datafile)
6. Filename Record: (1 per datafile, tempfile or logfile group member)
7. Tablespace Record: (1 per tablespace)
8. Temporary File Record: (1 per tempfile)
9. RMAN Configuration Record: (1 per configuration parameter)
10. Log History Record: (1 per completed logfile)
11. Offline Range Record: (1 per offline range per datafile)
12. Archived Log Record: (1 per archived log)
13. Backup Set Record: (1 per backup set)
14. Backup Piece Record: (1 per backup piece)
15. Backup Datafile Record: (1 per datafile)
16. Backup Redo-log Record: (1 per archived log)
17. Datafile Copy Record: (1 per datafile)
18. Backup Datafile Corruption Record: (1 per corrupt range)
19. Datafile Copy Corruption Record: (1 per corrupt range)
20. Deleted Object Record: (1 per deleted object)
21. Proxy Copy Record: (1 per proxy datafile or archived log)
22. Backup SPFILE Record: (1 per SPFILE)
23. Extended Database Information Record: (1 per database)
24. Flashback Database Log Record: (1 per flashblack log)
25. Recovery Destination Information Record: (1 per database)
26. Instance Recovery Table Record: (1 per instance)
27. Aged File Record: (1 per aged control file record)
28. RMAN Status Record: (1 per RMAN session/operation)
29. Thread Instance Name Mapping Record: (1 per thread)
30. MTTR Record: (1 per thread)
31. Datafile History Record: (1 per dropped datafile)