Database checkpoint scn --以下自于control file的 dump：
Database checkpoint: Thread=1 scn: 0x0000.0006b6fe
datafile checkpoint scn--以下来自于control file的 dump：
DATA FILE #4: (name #4) /u01/app/oracle/oradata/orcl/users01.dbf creation size=0 block size=8192 status=0xe head=4 tail=4 dup=1 tablespace 4, index=4 krfil=4 prev_file=0 unrecoverable scn: 0x0000.00000000 01/01/1988 00:00:00 Checkpoint cnt:57 scn: 0x0000.0006b6fe 05/14/2015 05:39:06 --->datafile checkpoint scn: scn: 0x0000.0006b6fe Stop scn: 0xffff.ffffffff 05/13/2015 12:23:12 Creation Checkpointed at scn: 0x0000.000022b3 04/20/2010 08:24:34 thread:0 rba:(0x0.0.0) enabled threads: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 Offline scn: 0x0000.0005eca8 prev_range: 0 Online Checkpointed at scn: 0x0000.0005eca9 05/13/2015 08:13:06 thread:1 rba:(0x1.2.0) enabled threads: 01000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 Hot Backup end marker scn: 0x0000.00000000 aux_file is NOT DEFINED DATA FILE #5: --->从此处开始是另外的一个datafile。
start scn--以下来自于datafile header的 dump：
DATA FILE #4: (name #4) /u01/app/oracle/oradata/orcl/users01.dbf creation size=0 block size=8192 status=0xe head=4 tail=4 dup=1 tablespace 4, index=4 krfil=4 prev_file=0 unrecoverable scn: 0x0000.00000000 01/01/1988 00:00:00 Checkpoint cnt:57 scn: 0x0000.0006b6fe 05/14/2015 05:39:06 ---> scn: scn: 0x0000.0006b6fe Stop scn: 0xffff.ffffffff 05/13/2015 12:23:12 Creation Checkpointed at scn: 0x0000.000022b3 04/20/2010 08:24:34 thread:0 rba:(0x0.0.0) enabled threads: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 Offline scn: 0x0000.0005eca8 prev_range: 0 Online Checkpointed at scn: 0x0000.0005eca9 05/13/2015 08:13:06 thread:1 rba:(0x1.2.0) enabled threads: 01000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 Hot Backup end marker scn: 0x0000.00000000 aux_file is NOT DEFINED V10 STYLE FILE HEADER: -------------->从此处开始，往下直到倒数第二行，都是 datafile header的 dump 比 control file的 dump 多的信息。 Compatibility Vsn = 169870592=0xa200500 Db ID=1407362313=0x53e2a509, Db Name='ORCL' Activation ID=0=0x0 Control Seq=430=0x1ae, File size=640=0x280 File Number=4, Blksiz=8192, File Type=3 DATA Tablespace #4 - USERS rel_fn:4 Creation at scn: 0x0000.000022b3 04/20/2010 08:24:34 Backup taken at scn: 0x0000.00000000 01/01/1988 00:00:00 thread:0 reset logs count:0x346d5992 scn: 0x0000.0005eca9 reset logs terminal rcv data:0x0 scn: 0x0000.00000000 prev reset logs count:0x2ab99238 scn: 0x0000.00000001 prev reset logs terminal rcv data:0x0 scn: 0x0000.00000000 recovered at 05/14/2015 05:39:03 status:0x4 root dba:0x00000000 chkpt cnt: 57 ctl cnt:56 begin-hot-backup file size: 0 Checkpointed at scn: 0x0000.0006b6fe 05/14/2015 05:39:06 thread:1 rba:(0x9.2.10) enabled threads: 01000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 Backup Checkpointed at scn: 0x0000.00000000 thread:0 rba:(0x0.0.0) enabled threads: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 External cache id: 0x0 0x0 0x0 0x0 Absolute fuzzy scn: 0x0000.00000000 Recovery fuzzy scn: 0x0000.00000000 01/01/1988 00:00:00 Terminal Recovery Stamp 01/01/1988 00:00:00 Platform Information: Creation Platform ID: 13 Current Platform ID: 13 Last Platform ID: 13 DATA FILE #5: --->从此处开始是另外的一个datafile。
从control file 和 datafile header上获得不同的scn信息
原文：http://blog.csdn.net/msdnchina/article/details/45771417