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undo表空间文件丢失恢复（3）--无备份无redo的情况下恢复

發布時間：2025/3/20 编程问答 49 豆豆

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undo表空間的數據文件丟失，如果沒有備份的情況下，而且redo也不可用，這個時候就要采用隱藏參數來恢復，下邊給出一個例子。

undo表空間文件丟失恢復（1）--有備份的情況下恢復：http://blog.itpub.net/26736162/viewspace-1458654/

undo表空間文件丟失恢復（2）--無備份有redo的情況下恢復：http://blog.itpub.net/26736162/viewspace-1458663/

[oracle@rhel6_lhr ~]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.4.0 - Production on Thu Mar 12 18:13:13 2015

Connected to:

Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

SQL> create undo tablespace undotbs2 datafile '/u03/app/oracle/oradata/ora1024g/undotbs02.dbf' size 5m autoextend on;

Tablespace created.

SQL> show parameter undo

NAME???????????????????????????????? TYPE??????? VALUE

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

undo_management????????????????????? string????? AUTO

undo_retention?????????????????????? integer???? 900

undo_tablespace????????????????????? string????? UNDOTBS1

SQL> create table bb as select * from user_tables;

Table created.

SQL> insert into bb select * from user_tables;

707 rows created.

SQL> shutdown abort;

ORACLE instance shut down.

SQL>

SQL> ho rm?? /u03/app/oracle/oradata/ora1024g/undotbs01.dbf

SQL> startup force;

ORACLE instance started.

Total System Global Area? 448790528 bytes

Fixed Size????????????????? 2084616 bytes

Variable Size???????????? 130023672 bytes

Database Buffers????????? 310378496 bytes

Redo Buffers??????????????? 6303744 bytes

Database mounted.

ORA-01157: cannot identify/lock data file 2 - see DBWR trace file

ORA-01110: data file 2: '/u03/app/oracle/oradata/ora1024g/undotbs01.dbf'

SQL> alter system set undo_tablespace=undotbs2 scope=spfile;

System altered.

SQL> alter system set undo_management=manual scope=spfile;

System altered.

SQL> startup force mount;

ORACLE instance started.

Total System Global Area? 448790528 bytes

Fixed Size????????????????? 2084616 bytes

Variable Size???????????? 130023672 bytes

Database Buffers????????? 310378496 bytes

Redo Buffers??????????????? 6303744 bytes

Database mounted.

SQL> set line 9999

SQL> col name format a100

SQL> select name,status,enabled from v$datafile;

NAME???????????????????????????????????????????????????????????????????????????????????????????????? STATUS? ENABLED

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

/u03/app/oracle/oradata/ora1024g/system01.dbf??????????????????????????????????????????????????????? SYSTEM? READ WRITE

/u03/app/oracle/oradata/ora1024g/undotbs01.dbf?????????????????????????????????????????????????????? ONLINE? READ WRITE

/u03/app/oracle/oradata/ora1024g/sysaux01.dbf??????????????????????????????????????????????????????? ONLINE? READ WRITE

/u03/app/oracle/oradata/ora1024g/users01.dbf???????????????????????????????????????????????????????? ONLINE? READ WRITE

/u03/app/oracle/oradata/ora1024g/example01.dbf?????????????????????????????????????????????????????? ONLINE? READ WRITE

/u03/app/oracle/oradata/ora1024g/undotbs02.dbf?????????????????????????????????????????????????????? ONLINE? READ WRITE

6 rows selected.

SQL>

SQL> alter database datafile 2 offline;

Database altered.

---注意這里undo的狀態為recover

SQL>? select file#,name,status,enabled from v$datafile;

???? FILE# NAME???????????????????????????????????????????????????????????????????????????????????????????????? STATUS? ENABLED

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

???????? 1 /u03/app/oracle/oradata/ora1024g/system01.dbf??????????????????????????????????????????????????????? SYSTEM? READ WRITE

???????? 2 /u03/app/oracle/oradata/ora1024g/undotbs01.dbf?????????????????????????????????????????????????????? RECOVER READ WRITE

???????? 3 /u03/app/oracle/oradata/ora1024g/sysaux01.dbf??????????????????????????????????????????????????????? ONLINE? READ WRITE

???????? 4 /u03/app/oracle/oradata/ora1024g/users01.dbf???????????????????????????????????????????????????????? ONLINE? READ WRITE

???????? 5 /u03/app/oracle/oradata/ora1024g/example01.dbf?????????????????????????????????????????????????????? ONLINE? READ WRITE

???????? 6 /u03/app/oracle/oradata/ora1024g/undotbs02.dbf?????????????????????????????????????????????????????? ONLINE? READ WRITE

6 rows selected.

SQL> alter database open;

alter database open

ERROR at line 1:

ORA-01092: ORACLE instance terminated. Disconnection forced

SQL>

此時查看altert日志：

Thu Mar 12 18:16:17 2015

alter database open

Thu Mar 12 18:16:17 2015

Beginning crash recovery of 1 threads

parallel recovery started with 2 processes

Thu Mar 12 18:16:17 2015

Started redo scan

Thu Mar 12 18:16:17 2015

Completed redo scan

123 redo blocks read, 23 data blocks need recovery

Thu Mar 12 18:16:17 2015

Started redo application at

Thread 1: logseq 3, block 99

Thu Mar 12 18:16:17 2015

Recovery of Online Redo Log: Thread 1 Group 3 Seq 3 Reading mem 0

? Mem# 0: /u03/app/oracle/oradata/ora1024g/redo03.log

Thu Mar 12 18:16:17 2015

Completed redo application

Thu Mar 12 18:16:18 2015

Completed crash recovery at

Thread 1: logseq 3, block 222, scn 734292

23 data blocks read, 23 data blocks written, 123 redo blocks read

Thu Mar 12 18:16:18 2015

LGWR: STARTING ARCH PROCESSES

ARC0 started with pid=18, OS id=33684

Thu Mar 12 18:16:18 2015

ARC0: Archival started

ARC1: Archival started

LGWR: STARTING ARCH PROCESSES COMPLETE

ARC1 started with pid=19, OS id=33686

Thu Mar 12 18:16:18 2015

Thread 1 advanced to log sequence 4 (thread open)

Thread 1 opened at log sequence 4

? Current log# 1 seq# 4 mem# 0: /u03/app/oracle/oradata/ora1024g/redo01.log

Successful open of redo thread 1

Thu Mar 12 18:16:18 2015

MTTR advisory is disabled because FAST_START_MTTR_TARGET is not set

Thu Mar 12 18:16:18 2015

ARC0: Becoming the 'no FAL' ARCH

ARC0: Becoming the 'no SRL' ARCH

Thu Mar 12 18:16:18 2015

SMON: enabling cache recovery

Thu Mar 12 18:16:18 2015

ARC1: Becoming the heartbeat ARCH

Thu Mar 12 18:16:18 2015

db_recovery_file_dest_size of 2048 MB is 29.58% used. This is a

user-specified limit on the amount of space that will be used by this

database for recovery-related files, and does not reflect the amount of

space available in the underlying filesystem or ASM diskgroup.

Thu Mar 12 18:16:18 2015

Errors in file /u03/app/oracle/admin/ora1024g/udump/ora1024g_ora_33662.trc:

ORA-00376: file 2 cannot be read at this time

ORA-01110: data file 2: '/u03/app/oracle/oradata/ora1024g/undotbs01.dbf'

Thu Mar 12 18:16:18 2015

Error 376 happened during db open, shutting down database

USER: terminating instance due to error 376

Instance terminated by USER, pid = 33662

ORA-1092 signalled during: alter database open...

查看文件： /u03/app/oracle/admin/ora1024g/udump/ora1024g_ora_33662.trc

[root@rhel6_lhr ~]# more /u03/app/oracle/admin/ora1024g/udump/ora1024g_ora_33662.trc

/u03/app/oracle/admin/ora1024g/udump/ora1024g_ora_33662.trc

Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

ORACLE_HOME = /u03/app/oracle/product/10.2.0/db_1

System name:??? Linux

Node name:????? rhel6_lhr

Release:??????? 2.6.32-431.el6.x86_64

Version:??????? #1 SMP Sun Nov 10 22:19:54 EST 2013

Machine:??????? x86_64

Instance name: ora1024g

Redo thread mounted by this instance: 1

Oracle process number: 15

Unix process pid: 33662, image: oracle@rhel6_lhr (TNS V1-V3)

*** 2015-03-12 18:16:17.849

*** ACTION NAME:() 2015-03-12 18:16:17.849

*** MODULE NAME:(sqlplus@rhel6_lhr (TNS V1-V3)) 2015-03-12 18:16:17.849

*** SERVICE NAME:() 2015-03-12 18:16:17.849

*** SESSION ID:(159.3) 2015-03-12 18:16:17.849

Successfully allocated 2 recovery slaves

Using 550 overflow buffers per recovery slave

Thread 1 checkpoint: logseq 3, block 2, scn 713814

? cache-low rba: logseq 3, block 99

??? on-disk rba: logseq 3, block 222, scn 714292

? start recovery at logseq 3, block 99, scn 0

----- Redo read statistics for thread 1 -----

Read rate (ASYNC): 61Kb in 0.12s => 0.50 Mb/sec

Total physical reads: 4096Kb

Longest record: 1Kb, moves: 0/284 (0%)

Change moves: 4/47 (8%), moved: 0Mb

Longest LWN: 38Kb, moves: 0/21 (0%), moved: 0Mb

Last redo scn: 0x0000.000ae633 (714291)

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

----- Recovery Hash Table Statistics ---------

Hash table buckets = 32768

Longest hash chain = 1

Average hash chain = 23/23 = 1.0

Max compares per lookup = 1

Avg compares per lookup = 176/225 = 0.8

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

*** 2015-03-12 18:16:17.970

KCRA: start recovery claims for 23 data blocks

*** 2015-03-12 18:16:17.999

KCRA: blocks processed = 23/23, claimed = 23, eliminated = 0

*** 2015-03-12 18:16:17.999

Recovery of Online Redo Log: Thread 1 Group 3 Seq 3 Reading mem 0

----- Recovery Hash Table Statistics ---------

Hash table buckets = 32768

Longest hash chain = 1

Average hash chain = 23/23 = 1.0

Max compares per lookup = 1

Avg compares per lookup = 191/199 = 1.0

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

tkcrrsarc: (WARN) Failed to find ARCH for message (message:0x1)

tkcrrpa: (WARN) Failed initial attempt to send ARCH message (message:0x1)

ORA-00376: file 2 cannot be read at this time

ORA-01110: data file 2: '/u03/app/oracle/oradata/ora1024g/undotbs01.dbf'

[root@rhel6_lhr ~]#

必須讀取2號文件才能保證一致性，此時使用隱含參數：

[oracle@rhel6_lhr ~]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.4.0 - Production on Thu Mar 12 18:22:58 2015

Connected to an idle instance.

SQL> startup mount;

ORACLE instance started.

Total System Global Area? 448790528 bytes

Fixed Size????????????????? 2084616 bytes

Variable Size???????????? 130023672 bytes

Database Buffers????????? 310378496 bytes

Redo Buffers??????????????? 6303744 bytes

Database mounted.

SQL>? alter system set "_offline_rollback_segments"=true scope=spfile;

System altered.

SQL> startup force mount;

ORACLE instance started.

Total System Global Area? 448790528 bytes

Fixed Size????????????????? 2084616 bytes

Variable Size???????????? 130023672 bytes

Database Buffers????????? 310378496 bytes

Redo Buffers??????????????? 6303744 bytes

Database mounted.

SQL> alter database open;

alter database open

ERROR at line 1:

ORA-01092: ORACLE instance terminated. Disconnection forced

SQL> exit

Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

[oracle@rhel6_lhr dbs]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.4.0 - Production on Thu Mar 12 20:36:56 2015

Connected to an idle instance.

SQL> startup mount;

ORACLE instance started.

Total System Global Area? 448790528 bytes

Fixed Size????????????????? 2084616 bytes

Variable Size???????????? 130023672 bytes

Database Buffers????????? 310378496 bytes

Redo Buffers??????????????? 6303744 bytes

Database mounted.

SQL> alter system set "_corrupted_rollback_segments"='_SYSSMU1$','_SYSSMU2$','_SYSSMU3$','_SYSSMU4$','_SYSSMU5$','_SYSSMU6$','_SYSSMU7$','_SYSSMU8$','_SYSSMU9$','_SYSSMU10$' scope=spfile;

System altered.

SQL> alter database open;

SQL> set line 9999

SQL> col name format a100

SQL> select name,status,enabled from v$datafile;

NAME???????????????????????????????????????????????????????????????????????????????????????????????? STATUS? ENABLED

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

/u03/app/oracle/oradata/ora1024g/system01.dbf??????????????????????????????????????????????????????? SYSTEM? READ WRITE

/u03/app/oracle/oradata/ora1024g/undotbs01.dbf?????????????????????????????????????????????????????? OFFLINE READ WRITE

/u03/app/oracle/oradata/ora1024g/sysaux01.dbf??????????????????????????????????????????????????????? ONLINE? READ WRITE

/u03/app/oracle/oradata/ora1024g/users01.dbf???????????????????????????????????????????????????????? ONLINE? READ WRITE

/u03/app/oracle/oradata/ora1024g/example01.dbf?????????????????????????????????????????????????????? ONLINE? READ WRITE

/u03/app/oracle/oradata/ora1024g/undotbs02.dbf?????????????????????????????????????????????????????? ONLINE? READ WRITE

6 rows selected.

SQL> select segment_name,status,tablespace_name from dba_rollback_segs;

SEGMENT_NAME?????????????????? STATUS?????????? TABLESPACE_NAME

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

SYSTEM???????????????????????? ONLINE?????????? SYSTEM

_SYSSMU10$???????????????????? OFFLINE????????? UNDOTBS1

_SYSSMU9$????????????????????? OFFLINE????????? UNDOTBS1

_SYSSMU8$????????????????????? OFFLINE????????? UNDOTBS1

_SYSSMU7$????????????????????? OFFLINE????????? UNDOTBS1

_SYSSMU6$????????????????????? OFFLINE????????? UNDOTBS1

_SYSSMU5$????????????????????? OFFLINE????????? UNDOTBS1

_SYSSMU4$????????????????????? OFFLINE????????? UNDOTBS1

_SYSSMU3$????????????????????? OFFLINE????????? UNDOTBS1

_SYSSMU2$????????????????????? OFFLINE????????? UNDOTBS1

_SYSSMU1$????????????????????? OFFLINE????????? UNDOTBS1

_SYSSMU20$???????????????????? OFFLINE????????? UNDOTBS2

_SYSSMU19$???????????????????? OFFLINE????????? UNDOTBS2

_SYSSMU18$???????????????????? OFFLINE????????? UNDOTBS2

_SYSSMU17$???????????????????? OFFLINE????????? UNDOTBS2

_SYSSMU16$???????????????????? OFFLINE????????? UNDOTBS2

_SYSSMU15$???????????????????? OFFLINE????????? UNDOTBS2

_SYSSMU14$???????????????????? OFFLINE????????? UNDOTBS2

_SYSSMU13$???????????????????? OFFLINE????????? UNDOTBS2

_SYSSMU12$???????????????????? OFFLINE????????? UNDOTBS2

_SYSSMU11$???????????????????? OFFLINE????????? UNDOTBS2

21 rows selected.

SQL> create undo tablespace undotbs1 datafile '/u03/app/oracle/oradata/ora1024g/undotbs01.dbf' size 50m autoextend on;

Tablespace created.

SQL> alter system set undo_tablespace=UNDOTBS1? scope=spfile;

System altered.

SQL> alter system set undo_management=auto? scope=spfile;

System altered.

SQL> alter system reset "_offline_rollback_segments" scope=spfile sid='*';

System altered.

SQL> alter system reset "_corrupted_rollback_segments" scope=spfile sid='*';

System altered.

SQL>

SQL> shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup

ORACLE instance started.

Total System Global Area? 448790528 bytes

Fixed Size????????????????? 2084616 bytes

Variable Size???????????? 130023672 bytes

Database Buffers????????? 310378496 bytes

Redo Buffers??????????????? 6303744 bytes

Database mounted.

Database opened.

SQL> show parameter undo

NAME???????????????????????????????? TYPE??????? VALUE

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

undo_management????????????????????? string????? AUTO

undo_retention?????????????????????? integer???? 900

undo_tablespace????????????????????? string????? UNDOTBS1

SQL>

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