110T oracle故障恢复

Posted on 2022 年 02 月 23 日 by 惜分飞

有客户一套110T的数据库由于存储控制器故障导致数据库无法正常启动,启动报错如下：

Wed Feb  2 23:16:13 2022
Recovery of Online Redo Log: Thread 1 Group 7 Seq 1647469 Reading mem 0
  Mem# 0: /dev/vgredo6/rredo7b
  Mem# 1: /dev/vgredo4/rredo7a
Wed Feb  2 23:16:14 2022
Errors in file /opt/oracle/admin/xifenfei/udump/xifenfei_ora_26754.trc:
ORA-07445: exception encountered: core dump [_memcpy()+7040] [SIGSEGV] [Address not mapped to object] [] [] []
Wed Feb  2 23:16:15 2022
Errors in file /opt/oracle/admin/xifenfei/udump/xifenfei_ora_26754.trc:
ORA-07445: exception encountered: core dump [kcbzdh()+560] [SIGSEGV] [Address not mapped to object] [] [] []
ORA-07445: exception encountered: core dump [_memcpy()+7040] [SIGSEGV] [Address not mapped to object] [] [] []
Wed Feb  2 23:16:16 2022
Errors in file /opt/oracle/admin/xifenfei/udump/xifenfei_ora_26754.trc:
ORA-07445: exception encountered: core dump [kcbzdh()+560] [SIGSEGV] [Address not mapped to object] [] [] []
ORA-07445: exception encountered: core dump [kcbzdh()+560] [SIGSEGV] [Address not mapped to object] [] [] []
ORA-07445: exception encountered: core dump [_memcpy()+7040] [SIGSEGV] [Address not mapped to object] [] [] []
Wed Feb  2 23:16:16 2022
Errors in file /opt/oracle/admin/xifenfei/udump/xifenfei_ora_26754.trc:
ORA-00600: internal error code, arguments: [kghstack_free2], [], [], [], [], [], [], []
ORA-00607: Internal error occurred while making a change to a data block
ORA-00602: internal programming exception
ORA-07445: exception encountered: core dump [kcbzdh()+560] [SIGSEGV] [Address not mapped to object] [] [] []
ORA-07445: exception encountered: core dump [kcbzdh()+560] [SIGSEGV] [Address not mapped to object] [] [] []
ORA-07445: exception encountered: core dump [_memcpy()+7040] [SIGSEGV] [Address not mapped to object] [] [] []
Wed Feb  2 23:16:26 2022
Errors in file /opt/oracle/admin/xifenfei/bdump/xifenfei_pmon_26722.trc:
ORA-07445: exception encountered: core dump [kcbzre1()+6593] [SIGSEGV] [Address not mapped to object] [] [] []
Wed Feb  2 23:16:27 2022
Errors in file /opt/oracle/admin/xifenfei/bdump/xifenfei_pmon_26722.trc:
ORA-07445: exception encountered: core dump [kcbs_dump_adv_state()+1200] [SIGSEGV][] []
ORA-07445: exception encountered: core dump [kcbzre1()+6593] [SIGSEGV] [Address not mapped to object] [] [] []
Wed Feb  2 23:16:27 2022
Errors in file /opt/oracle/admin/xifenfei/bdump/xifenfei_pmon_26722.trc:
ORA-00602: internal programming exception
ORA-07445: exception encountered: core dump [kcbs_dump_adv_state()+1200] [SIGSEGV][] []
ORA-07445: exception encountered: core dump [kcbzre1()+6593] [SIGSEGV] [Address not mapped to object] [] [] []
Wed Feb  2 23:17:11 2022
PSP0: terminating instance due to error 472
Instance terminated by PSP0, pid = 26724

该错误原因是由于redo信息和数据文件block信息不匹配导致无法正常应用日志,从而出现异常,在后续的recover 中还出现以下错误

Fri Feb 18 16:09:59 2022
ALTER DATABASE RECOVER  datafile 609,610,611,612,613,614,615,602,603,604,605,606,607,608  
Fri Feb 18 16:09:59 2022
Media Recovery Start
 parallel recovery started with 16 processes
Fri Feb 18 16:10:00 2022
Recovery of Online Redo Log: Thread 1 Group 7 Seq 1647469 Reading mem 0
  Mem# 0: /dev/vgredo6/rredo7b
  Mem# 1: /dev/vgredo4/rredo7a
Fri Feb 18 16:12:17 2022
Errors in file /opt/oracle/admin/xifenfei/bdump/xifenfei_p000_22509.trc:
ORA-00600: internal error code, arguments: [6101], [0], [42], [96], [], [], [], []
Fri Feb 18 16:18:51 2022
Errors in file /opt/oracle/admin/xifenfei/bdump/xifenfei_p000_22509.trc:
ORA-10562: Error occurred while applying redo to data block (file# 602, block# 1693691)
ORA-10564: tablespace DBS_DCDL_PT
ORA-01110: data file 602: '/dev/vgora12/rdbs_dcdl_pt0155'
ORA-10561: block type 'TRANSACTION MANAGED INDEX BLOCK', data object# 33682645
ORA-00600: internal error code, arguments: [6101], [0], [42], [96], [], [], [], []
Fri Feb 18 16:18:55 2022
Media Recovery failed with error 12801

Fri Feb 18 18:23:59 2022
Errors in file /opt/oracle/admin/xifenfei/bdump/xifenfei_dbw1_22483.trc:
ORA-07445: exception encountered: core dump [kcbs_dump_adv_state()+1200] [SIGSEGV][] []
ORA-07445: exception encountered: core dump [ksuitm()+2400] [SIGSEGV] [] [] [] []
ORA-00472: PMON  process terminated with error
Fri Feb 18 18:24:04 2022
DBW3: terminating instance due to error 472
Fri Feb 18 18:24:04 2022
Errors in file /opt/oracle/admin/xifenfei/bdump/xifenfei_dbw3_22487.trc:
ORA-07445: exception encountered: core dump [ksuitm()+2400] [SIGSEGV] [] [] [] []
ORA-00472: PMON  process terminated with error
Fri Feb 18 18:24:04 2022
Errors in file /opt/oracle/admin/xifenfei/bdump/xifenfei_dbw3_22487.trc:
ORA-07445: exception encountered: core dump [kcbs_dump_adv_state()+1200] [SIGSEGV] [] []
ORA-07445: exception encountered: core dump [ksuitm()+2400] [SIGSEGV] [] [] [] []
ORA-00472: PMON  process terminated with error
Fri Feb 18 18:24:09 2022
LGWR: terminating instance due to error 472
Fri Feb 18 18:24:09 2022
Errors in file /opt/oracle/admin/xifenfei/bdump/xifenfei_lgwr_22489.trc:
ORA-07445: exception encountered: core dump [ksuitm()+2400] [SIGSEGV] [] [] [] []
ORA-00472: PMON  process terminated with error

从sqlplus中看到类似一些报错

SQL>  recover datafile 601;
ORA-03113: end-of-file on communication channel

SQL> recover datafile 1066;
ORA-00283: recovery session canceled due to errors
ORA-12801: error signaled in parallel query server P015
ORA-00600: internal error code, arguments: [2037], [207064103], [207064103],
[162], [6], [1], [1833009883], [1130705717]


SQL> recover datafile 1065;
ORA-00283: recovery session canceled due to errors
ORA-12801: error signaled in parallel query server P004
ORA-00600: internal error code, arguments: [kcbzpb_1], [142189139], [3], [0],
[], [], [], []


SQL> recover datafile 2042;
ORA-00283: recovery session canceled due to errors
ORA-12801: error signaled in parallel query server P014
ORA-00600: internal error code, arguments: [3020], [627], [3234156],
[2633062764], [], [], [], []
ORA-10567: Redo is inconsistent with data block

通过屏蔽一致性,强制open库成功

Sun Feb 20 21:20:06 2022
SMON: enabling tx recovery
Sun Feb 20 21:20:06 2022
Database Characterset is ZHS16GBK
Sun Feb 20 21:20:07 2022
ORACLE Instance xifenfei (pid = 38) - Error 376 encountered while recovering transaction (74, 17) on object 34131051.
Sun Feb 20 21:20:07 2022
Errors in file /opt/oracle/admin/xifenfei/bdump/xifenfei_smon_25140.trc:
ORA-00376: file 1416 cannot be read at this time
ORA-01110: data file 1416: '/dev/vgora14/rdbs_icdl_pt116'
Sun Feb 20 21:20:08 2022
Stopping background process MMNL
Sun Feb 20 21:20:09 2022
ORACLE Instance xifenfei (pid = 38) - Error 376 encountered while recovering transaction (88, 36) on object 33514955.
Sun Feb 20 21:20:09 2022
Errors in file /opt/oracle/admin/xifenfei/bdump/xifenfei_smon_25140.trc:
ORA-00376: file 1264 cannot be read at this time
ORA-01110: data file 1264: '/dev/vgora14/rdbs_icdl_pt102'
Sun Feb 20 21:20:09 2022
Stopping background process MMON
Starting background process MMON
Starting background process MMNL
MMON started with pid=46, OS id=1482
Sun Feb 20 21:20:10 2022
Errors in file /opt/oracle/admin/xifenfei/bdump/xifenfei_smon_25140.trc:
ORA-01578: ORACLE data block corrupted (file # 652, block # 3767844)
ORA-01110: data file 652: '/dev/vgora13/rdbs_dcdl_pt0205'
Sun Feb 20 21:20:10 2022
Errors in file /opt/oracle/admin/xifenfei/bdump/xifenfei_smon_25140.trc:
ORA-01578: ORACLE data block corrupted (file # 652, block # 3767661)
ORA-01110: data file 652: '/dev/vgora13/rdbs_dcdl_pt0205'
replication_dependency_tracking turned off (no async multimaster replication found)
Sun Feb 20 21:20:11 2022
Errors in file /opt/oracle/admin/xifenfei/bdump/xifenfei_smon_25140.trc:
ORA-01578: ORACLE data block corrupted (file # 652, block # 3767661)
ORA-01110: data file 652: '/dev/vgora13/rdbs_dcdl_pt0205'
Sun Feb 20 21:20:11 2022
Errors in file /opt/oracle/admin/xifenfei/bdump/xifenfei_smon_25140.trc:
ORA-01578: ORACLE data block corrupted (file # 652, block # 3767661)
ORA-01110: data file 652: '/dev/vgora13/rdbs_dcdl_pt0205'
Sun Feb 20 21:20:11 2022
LOGSTDBY: Validating controlfile with logical metadata
Sun Feb 20 21:20:11 2022
LOGSTDBY: Validation complete
Sun Feb 20 21:20:11 2022
Errors in file /opt/oracle/admin/xifenfei/bdump/xifenfei_smon_25140.trc:
ORA-01578: ORACLE data block corrupted (file # 652, block # 3767661)
ORA-01110: data file 652: '/dev/vgora13/rdbs_dcdl_pt0205'
Completed: alter database open

对于异常undo进行处理,数据库正常open

由于客户短期无法迁移数据,先对于一些坏块进行修复，暂时运行数据库后续有时间窗口进行迁移.

ora-600 kcratr_scan_lastbwr

Posted on 2022 年 02 月 18 日 by 惜分飞

联系：手机/微信(+86 17813235971) QQ(107644445)

标题：ora-600 kcratr_scan_lastbwr

有客户数据库由于断电，导致启动报错ora-600 kcratr_scan_lastbwr错误

SQL> select * from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE    11.2.0.3.0      Production
TNS for Linux: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production

alter database open
Beginning crash recovery of 1 threads
 parallel recovery started with 15 processes
Started redo scan
Hex dump of (file 4, block 3952129) in trace file D:\APP\ADMINISTRATOR\diag\rdbms\orcl\orcl\trace\orcl_ora_4500.trc
Reading datafile 'D:\APP\ADMINISTRATOR\ORADATA\ORCL\USERS01.DBF' for corruption at rdba:0x013c4e01(file 4,block 3952129)
Reread (file 4, block 3952129) found same corrupt data (logically corrupt)
Write verification failed for File 4 Block 3952129 (rdba 0x13c4e01)
Fri Feb 18 10:16:34 2022
Errors in file D:\APP\ADMINISTRATOR\diag\rdbms\orcl\orcl\trace\orcl_ora_4500.trc  (incident=388961):
ORA-00600: ??????, ??: [kcratr_scan_lastbwr], [], [], [], [], [], [], [], [], [], [], []
Incident details in:D:\APP\ADMINISTRATOR\diag\rdbms\orcl\orcl\incident\incdir_388961\orcl_ora_4500_i388961.trc
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
Aborting crash recovery due to error 600
Errors in file D:\APP\ADMINISTRATOR\diag\rdbms\orcl\orcl\trace\orcl_ora_4500.trc:
ORA-00600: ??????, ??: [kcratr_scan_lastbwr], [], [], [], [], [], [], [], [], [], [], []
Errors in file D:\APP\ADMINISTRATOR\diag\rdbms\orcl\orcl\trace\orcl_ora_4500.trc:
ORA-00600: ??????, ??: [kcratr_scan_lastbwr], [], [], [], [], [], [], [], [], [], [], []
ORA-600 signalled during: alter database open...

根据MOS中的描述,这个问题主要出现在11.2.0.2之前版本中,但是本case发生在11.2.0.3的数据库中

ORA-600 [kcratr_scan_lastbwr] (Doc ID 1267231.1)描述,recover操作,数据库直接open,实现数据0丢失

redo异常强制拉库报ORA-600 kcbzib_kcrsds_1修复

Posted on 2022 年 01 月 27 日 by 惜分飞

联系：手机/微信(+86 17813235971) QQ(107644445)

标题：redo异常强制拉库报ORA-600 kcbzib_kcrsds_1修复

节点2 asm dismount导致redo写报错(ORA-00340,ORA-00345)，经过分析asm和系统日志,确认是由于多路径异常导致io异常

2022-01-24T23:44:39.966602+08:00
WARNING: group 4 is being dismounted.
WARNING: ASMB force dismounting group 4 (REDO) due to ASM server dismount
SUCCESS: diskgroup REDO was dismounted
2022-01-24T23:44:41.103783+08:00
Errors in file /u01/app/oracle/diag/rdbms/xff/XFF2/trace/XFF2_lgwr_228507.trc:
ORA-00345: redo log write error block 11961764 count 6
ORA-00312: online log 10 thread 2: '+REDO/XFF/ONLINELOG/group_10.261.1074690685'
2022-01-24T23:44:41.156809+08:00
Errors in file /u01/app/oracle/diag/rdbms/xff/XFF2/trace/XFF2_lgwr_228507.trc:
ORA-00340: IO error processing online log 10 of thread 2
ORA-00345: redo log write error block 11961764 count 6
ORA-00312: online log 10 thread 2: '+REDO/XFF/ONLINELOG/group_10.261.1074690685'
Errors in file /u01/app/oracle/diag/rdbms/xff/XFF2/trace/XFF2_lgwr_228507.trc  (incident=1341402):
ORA-340 [] [] [] [] [] [] [] [] [] [] [] []
Incident details in: /u01/app/oracle/diag/rdbms/xff/XFF2/incident/incdir_1341402/XFF2_lgwr_228507_i1341402.trc
2022-01-24T23:44:41.505251+08:00
USER (ospid: 133928): terminating the instance due to error 340

由于节点2是突然crash，节点1做实例恢复失败，由于节点2的redo发生了写丢失,导致节点1实例恢复后库crash,进而是的该集群的相关数据库节点全部crash

2022-01-24T23:46:08.440519+08:00
Slave encountered ORA-10388 exception during crash recovery
2022-01-24T23:46:08.442854+08:00
Slave encountered ORA-10388 exception during crash recovery
Abort recovery for domain 0, flags 4
2022-01-24T23:46:08.444531+08:00
Aborting crash recovery due to error 742
2022-01-24T23:46:08.444695+08:00
Errors in file /u01/app/oracle/diag/rdbms/xff/XFF1/trace/XFF1_ora_450481.trc:
ORA-00742: Log read detects lost write in thread 2 sequence 63507 block 11941482
ORA-00312: online log 10 thread 2: '+REDO/XFF/ONLINELOG/group_10.261.1074690685'
Abort recovery for domain 0, flags 4
2022-01-24T23:46:08.771108+08:00
Errors in file /u01/app/oracle/diag/rdbms/xff/XFF1/trace/XFF1_ora_450481.trc:
ORA-00742: Log read detects lost write inthread 2 sequence 63507 block 11941482
ORA-00312: online log 10 thread 2: '+REDO/XFF/ONLINELOG/group_10.261.1074690685'
ORA-742 signalled during: ALTER DATABASE OPEN /* db agent *//* {0:17:165} */...
2022-01-24T23:46:10.143155+08:00
License high water mark = 33
2022-01-24T23:46:10.143752+08:00
USER (ospid: 451049): terminating the instance
2022-01-24T23:46:11.167337+08:00
Instance terminated by USER, pid = 451049

经过第三方强制拉库之后,数据库报ORA-600 kcbzib_kcrsds_1

2022-01-25T10:13:37.922332+08:00
Completed crash recovery at
 Thread 2: RBA 5.3.16, nab 3, scn 0x00000a348a032122
 0 data blocks read, 0 data blocks written, 0 redo k-bytes read
2022-01-25T10:13:38.071326+08:00
Thread 2 advanced to log sequence 6 (thread recovery)
validate pdb 0, flags x4, valid 0, pdb flags x204 
* validated domain 0, flags = 0x200
CRASH recovery complete: pdb 0 valid 1 (flags x4, pdb flags x200) 
Picked broadcast on commit scheme to generate SCNs
Endian type of dictionary set to little
2022-01-25T10:13:38.389741+08:00
TT00: Gap Manager starting (PID:220505)
2022-01-25T10:13:38.646484+08:00
Thread 1 opened at log sequence 1
  Current log# 1 seq# 1 mem# 0: +DATA/XFF/ONLINELOG/group_1.536.1094875107
Successful open of redo thread 1
2022-01-25T10:13:38.647243+08:00
MTTR advisory is disabled because FAST_START_MTTR_TARGET is not set
Errors in file /u01/app/oracle/diag/rdbms/xff/XFF1/trace/XFF1_ora_216590.trc  (incident=1879556):
ORA-00600: internal error code, arguments: [kcbzib_kcrsds_1], [], [], [], [], [], [], [], [], [], [], []
Incident details in: /u01/app/oracle/diag/rdbms/xff/XFF1/incident/incdir_1879556/XFF1_ora_216590_i1879556.trc
Use ADRCI or Support Workbench to package the incident.
See Note 411.1 at My Oracle Support for error and packaging details.
*****************************************************************
An internal routine has requested a dump of selected redo.
This usually happens following a specific internal error, when
analysis of the redo logs will help Oracle Support with the
diagnosis.
It is recommended that you retain all the redo logs generated (by
all the instances) during the past 12 hours, in case additional
redo dumps are required to help with the diagnosis.
*****************************************************************
2022-01-25T10:13:39.734366+08:00
Errors in file /u01/app/oracle/diag/rdbms/xff/XFF1/trace/XFF1_ora_216590.trc:
ORA-00704: bootstrap process failure
ORA-00600: internal error code, arguments: [kcbzib_kcrsds_1], [], [], [], [], [], [], [], [], [], [], []
2022-01-25T10:13:39.734424+08:00
Errors in file /u01/app/oracle/diag/rdbms/xff/XFF1/trace/XFF1_ora_216590.trc:
ORA-00704: bootstrap process failure
ORA-00704: bootstrap process failure
ORA-00600: internal error code, arguments: [kcbzib_kcrsds_1], [], [], [], [], [], [], [], [], [], [], []
2022-01-25T10:13:39.734499+08:00
Errors in file /u01/app/oracle/diag/rdbms/xff/XFF1/trace/XFF1_ora_216590.trc:
ORA-00704: bootstrap process failure
ORA-00704: bootstrap process failure
ORA-00600: internal error code, arguments: [kcbzib_kcrsds_1], [], [], [], [], [], [], [], [], [], [], []
2022-01-25T10:13:39.734536+08:00
Error 704 happened during db open, shutting down database
Errors in file /u01/app/oracle/diag/rdbms/xff/XFF1/trace/XFF1_ora_216590.trc  (incident=1879557):
ORA-00603: ORACLE server session terminated by fatal error
ORA-01092: ORACLE instance terminated. Disconnection forced
ORA-00704: bootstrap process failure
ORA-00704: bootstrap process failure
ORA-00600: internal error code, arguments: [kcbzib_kcrsds_1], [], [], [], [], [], [], [], [], [], [], []
Incident details in: /u01/app/oracle/diag/rdbms/xff/XFF1/incident/incdir_1879557/XFF1_ora_216590_i1879557.trc
2022-01-25T10:13:39.894464+08:00
2022-01-25T10:13:40.446888+08:00
opiodr aborting process unknown ospid (216590) as a result of ORA-603
2022-01-25T10:13:40.470643+08:00
ORA-603 : opitsk aborting process
License high water mark = 36
2022-01-25T10:13:40.471453+08:00
USER (ospid: 216590): terminating the instance due to error 704
2022-01-25T10:13:41.436133+08:00
opiodr aborting process unknown ospid (189796) as a result of ORA-1092
2022-01-25T10:13:41.439011+08:00
ORA-1092 : opitsk aborting process
2022-01-25T10:13:41.472060+08:00
PMON (ospid: 189585): terminating the instance due to error 704

该错误是12c之后才有的报错,由于文件异常导致,通过以前的解决经验,接手这个问题之后快速调整数据库文件头信息,顺利open库
参考以前相关blog内容：
Oracle 12c redo 丢失恢复
 模拟19c数据库redo异常恢复
 ORA-600 kcbzib_kcrsds_1报错
 12C数据库报ORA-600 kcbzib_kcrsds_1故障处理
 ORA-00603 ORA-01092 ORA-600 kcbzib_kcrsds_1

[oracle@xifenfei02 ~]$ sqlplus / as sysdba

SQL*Plus: Release 12.2.0.1.0 Production on Wed Jan 26 00:31:50 2022

Copyright (c) 1982, 2016, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup mount pfile='/tmp/pfile'
ORACLE instance started.

Total System Global Area 3.2320E+11 bytes
Fixed Size                 29879248 bytes
Variable Size            4.5634E+10 bytes
Database Buffers         1.9059E+11 bytes
Redo Buffers             1043861504 bytes
In-Memory Area           8.5899E+10 bytes
Database mounted.
SQL> alter database open ;

Database altered.

ORA-600 6807恢复

Posted on 2022 年 01 月 06 日 by 惜分飞

联系：手机/微信(+86 17813235971) QQ(107644445)

标题：ORA-600 6807恢复

有朋友找到我,反馈说数据库登录报ORA-600 6807错误,希望我们给予解决

对于该错误有过一定的了解,一般是seq问题,这里报错比较明显是由于audses$序列出现问题导致数据库无法正常登录(因为数据库启动了审计,在登录之时会触发insert aud$操作,这个操作包含了audses$这个序列的调用,在调用这个序列的时候出现问题从而引起该问题),对其system数据文件dbv检查

比较明显有一个block被标记为坏块,通过对该block进行分析,确认刚好是seq$对象

DUL> rdba 4195465

  rdba   : 0x00400489=4195465
  rfile# : 1
  block# : 1161

DUL> desc sys.seq$


Object ID:100
Storage(Obj#=100 DataObj#=100 TS#=0 File#=1 Block#=1160 Cluster=0)

NO. SEG INT Column Name                    Null?     Type
--- --- --- ------------------------------ --------- ------------------------------
  1   1   1 OBJ#                           NOT NULL  NUMBER
  2   2   2 INCREMENT$                     NOT NULL  NUMBER
  3   3   3 MINVALUE                                 NUMBER
  4   4   4 MAXVALUE                                 NUMBER
  5   5   5 CYCLE#                         NOT NULL  NUMBER
  6   6   6 ORDER$                         NOT NULL  NUMBER
  7   7   7 CACHE                          NOT NULL  NUMBER
  8   8   8 HIGHWATER                      NOT NULL  NUMBER
  9   9   9 AUDIT$                         NOT NULL  VARCHAR2(38)
 10  10  10 FLAGS                                    NUMBER
 11  11  11 PARTCOUNT                                NUMBER

DUL> dump datafile 1 block 1160
Block Header:
block type=0x10 (data segment header block (unlimited extents))
block format=0xa2 (oracle 10+)
block rdba=0x00400488 (file#=1, block#=1160)
scn=0x0000.001a3fcd, seq=2, tail=0x3fcd1002
block checksum value=0xe280=57984, flag=4
Data Segment Header:
  Extent Control Header
  -------------------------------------------------------------
  Extent Header:: extents: 1  blocks: 7
                  last map: 0x00000000  #maps: 0  offset: 4128
      Highwater:: 0x0040048d  (rfile#=1,block#=1165)
                  ext#: 0  blk#: 4   ext size:7
      #blocks in seg. hdr's freelists: 1
      #blocks below: 4
      mapblk: 0x00000000   offset: 0
      Map Header:: next: 0x00000000   #extents: 1  obj#: 100  flag: 0x40000000
  Extent Control Header
  -------------------------------------------------------------
   0x00400489  length: 7

  nfl = 1, nfb = 1, typ = 1, nxf = 0, ccnt = 4
  SEG LST:: flg:  USED lhd: 0x0040048c ltl: 0x0040048c
DUL> rdba 0x00400489

  rdba   : 0x00400489=4195465
  rfile# : 1
  block# : 1161

DUL>

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