t Number:10? Commit Time: 1442068177
? Extent Number:11? Commit Time: 1442068178
? Extent Number:12? Commit Time: 1442068179
? Extent Number:13? Commit Time: 1442068180
? Extent Number:14? Commit Time: 1442068180
? Extent Number:15? Commit Time: 1442068181
? Extent Number:16? Commit Time: 1442068205
? Extent Number:17? Commit Time: 1442068236
? Extent Number:18? Commit Time: 1442068255
? Extent Number:19? Commit Time: 1442068290
? Extent Number:20? Commit Time: 1442068335
? Extent Number:21? Commit Time: 1442068385
? Extent Number:22? Commit Time: 1442068427
? Extent Number:23? Commit Time: 1442068450
? Extent Number:24? Commit Time: 1442068513
? Extent Number:25? Commit Time: 1442068541
? Extent Number:26? Commit Time: 1442068634
? Extent Number:27? Commit Time: 1442068634
? Extent Number:28? Commit Time: 1442068634
? Extent Number:29? Commit Time: 1442068667
? Extent Number:30? Commit Time: 1442068689
? Extent Number:31? Commit Time: 1442068689
? Extent Number:32? Commit Time: 1442068691
? Extent Number:33? Commit Time: 1442068739
? Extent Number:34? Commit Time: 1442068759
? Extent Number:35? Commit Time: 1442068764
? Extent Number:36? Commit Time: 1442068770
? Extent Number:37? Commit Time: 1442068770
? Extent Number:38? Commit Time: 1442068770
? Extent Number:39? Commit Time: 1442068795
? Extent Number:40? Commit Time: 1442068830
? Extent Number:41? Commit Time: 1442068831
? Extent Number:42? Commit Time: 1442068831
? Extent Number:43? Commit Time: 1442068834
? Extent Number:44? Commit Time: 1442068837
? Extent Number:45? Commit Time: 1442068837
? Extent Number:46? Commit Time: 1442068837
? Extent Number:47? Commit Time: 1442068839
? Extent Number:48? Commit Time: 1442068840
? Extent Number:49? Commit Time: 1442068840
? Extent Number:50? Commit Time: 1442068842
? Extent Number:51? Commit Time: 1442068872
? Extent Number:52? Commit Time: 1442068872
? Extent Number:53? Commit Time: 1442068872
? Extent Number:54? Commit Time: 1442068873
? Extent Number:55? Commit Time: 1442068914
? Extent Number:56? Commit Time: 1442068952
? Extent Number:57? Commit Time: 1442068956
? Extent Number:58? Commit Time: 1442068957
? Extent Number:59? Commit Time: 1442068957
? Extent Number:60? Commit Time: 1442068958
? Extent Number:61? Commit Time: 1442068958
? Extent Number:62? Commit Time: 1442068961
? Extent Number:63? Commit Time: 1442068975
? Extent Number:64? Commit Time: 1442069033
? Extent Number:65? Commit Time: 1448938830
?
? --trn ctl是事务表，和事务相关,事务表也有scn
? TRN CTL:: seq: 0x0046 chd: 0x0001 ctl: 0x002a inc: 0x00000000 nfb: 0x0001
? ? ? ? ? ? mgc: 0x8201 xts: 0x0068 flg: 0x0001 opt: 2147483646 (0x7ffffffe)
? ? ? ? ? ? uba: 0x00800158.0046.37 scn: 0x0000.028f6415? ? --scn
?Version: 0x01
? ---free block pool自由块池我理解可能是undo segment中的空闲块的存储信息，因为undo segment也是循环使用的啊
? FREE BLOCK POOL::
? ? uba: 0x00800158.0046.3a ext: 0x4? spc: 0x302?
? ? uba: 0x00000000.0046.25 ext: 0x4? spc: 0x904?
? ? uba: 0x00000000.0043.14 ext: 0x1? spc: 0x13fe?
? ? uba: 0x00000000.0013.09 ext: 0x13 spc: 0x1b8c?
? ? uba: 0x00000000.0000.00 ext: 0x0? spc: 0x0? ?
? TRN TBL::
?
? ---事务表的条目，共计48条，可能不同数据库版本也会有差异,可见事务表条目也有scn
? index? state cflags? wrap#? ? uel? ? ? ? scn? ? ? ? ? ? dba? ? ? ? ? ? parent-xid? ? nub? ? stmt_num? ? cmt
? ------------------------------------------------------------------------------------------------
? ? 0x00? ? 9? ? 0x00? 0x00b0? 0x000a? 0x0001.000009bb? 0x00800158? 0x0000.000.00000000? 0x00000001? 0x00000000? 1448957928
? ? 0x01? ? 9? ? 0x00? 0x0