使用 TSPITR 恢复删除的表空间的步骤 (Doc ID 1277795.1)

Steps To Recover A Dropped Tablespace Using TSPITR (Doc ID 1277795.1)

APPLIES TO:

Oracle Database - Enterprise Edition - Version 11.2.0.1 and later
Information in this document applies to any platform.
*** Checked for relevance on 16-NOV-2015 ***

PURPOSE

Recover a dropped tablespace using TSPITR.  使用TSPITR恢复删除的表空间

SCOPE

RMAN automatic Tablespace Point-In-Time Recovery ( TSPITR) enables you to quickly recover one or more tablespaces in an Oracle database to an earlier time, without affecting the state of the rest of the tablespaces and other objects in the database.

RMAN 自动表空间时间点恢复（TSPITR）使您可以将 Oracle 数据库中的一个或多个表空间快速恢复到更早的时间，而又不影响数据库中其余表空间和其他对象的状态。

Prior to 11.2 version the TSPITR had a restriction of not being able to recover the dropped tablespace.

在11.2版之前，TSPITR受到限制，无法恢复删除的表空间。

From 11.2 this limitation no longer exists. We can recover the dropped tablespace using TSPITR.

从11.2开始，此限制不再存在。我们可以使用TSPITR恢复删除的表空间

The below example is an attempt to show the steps and functioning of TSPITR to recover a dropped tablespace.

下面的示例尝试显示TSPITR恢复丢失的表空间的步骤和功能。

DETAILS

NOTE: In the images and/or the document content below, the user information and environment data used represents fictitious data from the Oracle sample schema(s), Public Documentation delivered with an Oracle database product or other training material. Any similarity to actual environments, actual persons, living or dead, is purely coincidental and not intended in any manner.

 

Example:

Target db name : ORA11G

1) Create a tablespace.

SQL> create tablespace users datafile 'D:\DATABASES\ORA11G\users01.dbf' size 10m reuse;

SQL> select tablespace_name from dba_tablespaces;

TABLESPACE_NAME
------------------------------
SYSTEM
SYSAUX
UNDOTBS1
TEMP
USERS

 

2) Create a user and create a table in the new tablespace.

SQL> create user tiger identified by ;
SQL> grant dba to tiger;
SQL> conn tiger/
SQL> create table objects tablespace users as select * from dba_objects ;
SQL> select count(*) from objects;

COUNT(*)
----------
17299

 

3) Make a note of the current log sequence number.  记下当前的日志序列号

SQL > select sequence# from v$log where status='CURRENT';

SEQUENCE#
----------
21

 

4) Take a backup of the database and the archivelogs.  备份数据库和归档日志

% rman target /
RMAN> backup database plus archivelog;

 

5) Now login to the database and just perform a few log switches and then drop the tablespace. 现在登录数据库，仅执行一些日志切换，然后删除表空间

SQL> alter system switch logfile;
SQL> alter system switch logfile;
SQL> drop tablespace users including contents and datafiles;

 

6) Now note down the current log sequence number in the database.  现在记下数据库中当前的日志序列号

SQL> select SEQUENCE# from v$log where status='CURRENT';

SEQUENCE#
----------
25

 

7) The log sequence number in the database when the tablespace was dropped is 25. So if we recover upto sequence 24 then we will be able to get the tablespace back. To recover upto sequence 24 we have use 24+1=25 in the set until clause of the TSPITR statement.

    删除表空间后，数据库中的日志序列号为25。因此，如果我们恢复到序列24，则可以取回表空间。为了恢复到序列24，我们在TSPITR语句的 set until 子句中使用24 + 1 = 25

% rman target /
RMAN> recover tablespace users until logseq 25 auxiliary destination 'd:\';

 

Starting recover at 03-JAN-11
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=15 device type=DISK
RMAN-05026: WARNING: presuming following set of tablespaces applies to specified point-in-time

List of tablespaces expected to have UNDO segments
Tablespace SYSTEM
Tablespace UNDOTBS1

Creating automatic instance, with SID='nyxF'
initialization parameters used for automatic instance:
db_name=ORA11G
db_unique_name=nyxF_tspitr_ORA11G
compatible=11.2.0.0.0
db_block_size=8192
db_files=200
sga_target=280M
processes=50
db_create_file_dest=d:\
log_archive_dest_1='location=d:\'
#No auxiliary parameter file used

starting up automatic instance ORA11G

Oracle instance started
Total System Global Area 292933632 bytes
Fixed Size 1374164 bytes
Variable Size 100665388 bytes
Database Buffers 184549376 bytes
Redo Buffers 6344704 bytes
Automatic instance created

List of tablespaces that have been dropped from the target database:
Tablespace users

contents of Memory Script:
{
# set requested point in time
set until logseq 25 thread 1;
# restore the controlfile
restore clone controlfile;
# mount the controlfile
sql clone 'alter database mount clone database';
# archive current online log
sql 'alter system archive log current';
# avoid unnecessary autobackups for structural changes during TSPITR
sql 'begin dbms_backup_restore.AutoBackupFlag(FALSE); end;';
}
executing Memory Script
executing command: SET until clause

Starting restore at 03-JAN-11
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: SID=59 device type=DISK

channel ORA_AUX_DISK_1: starting datafile backup set restore
channel ORA_AUX_DISK_1: restoring control file
channel ORA_AUX_DISK_1: reading from backup piece D:\DATABASES\ORA11G\FRA\ORA11G\BACKUPSET\2011_01_03\O1_MF_NCSNF_TAG20110103T092723_6L2LB86C_.BKP
channel ORA_AUX_DISK_1: piece handle=D:\DATABASES\ORA11G\FRA\ORA11G\BACKUPSET\2011_01_03\O1_MF_NCSNF_TAG20110103T092723_6L2LB86C_.BKP tag=TAG20110103T092723
channel ORA_AUX_DISK_1: restored backup piece 1
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01
output file name=D:\ORA11G\CONTROLFILE\O1_MF_6L2M39N0_.CTL
Finished restore at 03-JAN-11

sql statement: alter database mount clone database
sql statement: alter system archive log current
sql statement: begin dbms_backup_restore.AutoBackupFlag(FALSE); end;

contents of Memory Script:
{
# set requested point in time
set until logseq 25 thread 1;
# set destinations for recovery set and auxiliary set datafiles
set newname for clone datafile 1 to new;
set newname for clone datafile 3 to new;
set newname for clone datafile 2 to new;
set newname for clone tempfile 1 to new;
set newname for datafile 4 to
"D:\DATABASES\ORA11G\USERS01.DBF";
# switch all tempfiles
switch clone tempfile all;
# restore the tablespaces in the recovery set and the auxiliary set
restore clone datafile 1, 3, 2, 4;
switch clone datafile all;
}
executing Memory Script
executing command: SET until clause
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
renamed tempfile 1 to D:\ORA11G\DATAFILE\O1_MF_TEMP_%U_.TMP in control file

Starting restore at 03-JAN-11
using channel ORA_AUX_DISK_1

channel ORA_AUX_DISK_1: starting datafile backup set restore
channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_AUX_DISK_1: restoring datafile 00001 to D:\ORA11G\DATAFILE\O1_MF_SYSTEM_%U_.DBF
channel ORA_AUX_DISK_1: restoring datafile 00003 to D:\ORA11G\DATAFILE\O1_MF_UNDOTBS1_%U_.DBF
channel ORA_AUX_DISK_1: restoring datafile 00002 to D:\ORA11G\DATAFILE\O1_MF_SYSAUX_%U_.DBF
channel ORA_AUX_DISK_1: restoring datafile 00004 to D:\DATABASES\ORA11G\USERS01.DBF
channel ORA_AUX_DISK_1: reading from backup piece D:\DATABASES\ORA11G\FRA\ORA11G\BACKUPSET\2011_01_03\O1_MF_NNNDF_TAG20110103T092723_6L2L941Y_.BKP
channel ORA_AUX_DISK_1: piece handle=D:\DATABASES\ORA11G\FRA\ORA11G\BACKUPSET\2011_01_03\O1_MF_NNNDF_TAG20110103T092723_6L2L941Y_.BKP tag=TAG20110103T092723
channel ORA_AUX_DISK_1: restored backup piece 1
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:45
Finished restore at 03-JAN-11

datafile 1 switched to datafile copy
input datafile copy RECID=12 STAMP=739446137 file name=D:\ORA11G\DATAFILE\O1_MF_SYSTEM_6L2M3MRW_.DBF
datafile 3 switched to datafile copy
input datafile copy RECID=13 STAMP=739446137 file name=D:\ORA11G\DATAFILE\O1_MF_UNDOTBS1_6L2M3N8S_.DBF
datafile 2 switched to datafile copy
input datafile copy RECID=14 STAMP=739446137 file name=D:\ORA11G\DATAFILE\O1_MF_SYSAUX_6L2M3N1G_.DBF

contents of Memory Script:
{
# set requested point in time
set until logseq 25 thread 1;
# online the datafiles restored or switched
sql clone "alter database datafile 1 online";
sql clone "alter database datafile 3 online";
sql clone "alter database datafile 2 online";
sql clone "alter database datafile 4 online";
# recover and open resetlogs
recover clone database tablespace "USERS", "SYSTEM", "UNDOTBS1", "SYSAUX" delete archivelog;
alter clone database open resetlogs;
}
executing Memory Script

executing command: SET until clause
sql statement: alter database datafile 1 online
sql statement: alter database datafile 3 online
sql statement: alter database datafile 2 online
sql statement: alter database datafile 4 online

Starting recover at 03-JAN-11
using channel ORA_AUX_DISK_1

starting media recovery

archived log for thread 1 with sequence 22 is already on disk as file D:\DATABASES\ORA11G\FRA\ORA11G\ARCHIVELOG\2011_01_03\O1_MF_1_22_6L2LB9M1_.ARC
archived log for thread 1 with sequence 23 is already on disk as file D:\DATABASES\ORA11G\FRA\ORA11G\ARCHIVELOG\2011_01_03\O1_MF_1_23_6L2LPHCQ_.ARC
archived log for thread 1 with sequence 24 is already on disk as file D:\DATABASES\ORA11G\FRA\ORA11G\ARCHIVELOG\2011_01_03\O1_MF_1_24_6L2LPQ2G_.ARC
archived log file name=D:\DATABASES\ORA11G\FRA\ORA11G\ARCHIVELOG\2011_01_03\O1_MF_1_22_6L2LB9M1_.ARC thread=1 sequence=22
archived log file name=D:\DATABASES\ORA11G\FRA\ORA11G\ARCHIVELOG\2011_01_03\O1_MF_1_23_6L2LPHCQ_.ARC thread=1 sequence=23
archived log file name=D:\DATABASES\ORA11G\FRA\ORA11G\ARCHIVELOG\2011_01_03\O1_MF_1_24_6L2LPQ2G_.ARC thread=1 sequence=24
media recovery complete, elapsed time: 00:00:04
Finished recover at 03-JAN-11

database opened

contents of Memory Script:
{
# make read only the tablespace that will be exported
sql clone 'alter tablespace USERS read only';
# create directory for datapump import
sql "create or replace directory TSPITR_DIROBJ_DPDIR as ''
d:\''";
# create directory for datapump export
sql clone "create or replace directory TSPITR_DIROBJ_DPDIR as ''
d:\''";
}
executing Memory Script

sql statement: alter tablespace USERS read only
sql statement: create or replace directory TSPITR_DIROBJ_DPDIR as ''d:\''
sql statement: create or replace directory TSPITR_DIROBJ_DPDIR as ''d:\''

Performing export of metadata...
EXPDP> Starting "SYS"."TSPITR_EXP_nyxF":
EXPDP> Processing object type TRANSPORTABLE_EXPORT/PLUGTS_BLK
EXPDP> Processing object type TRANSPORTABLE_EXPORT/TABLE
EXPDP> Processing object type TRANSPORTABLE_EXPORT/POST_INSTANCE/PLUGTS_BLK
EXPDP> Master table "SYS"."TSPITR_EXP_nyxF" successfully loaded/unloaded
EXPDP> ******************************************************************************
EXPDP> Dump file set for SYS.TSPITR_EXP_nyxF is:
EXPDP> D:\TSPITR_NYXF_54517.DMP
EXPDP> ******************************************************************************
EXPDP> Datafiles required for transportable tablespace USERS:
EXPDP> D:\DATABASES\ORA11G\USERS01.DBF
EXPDP> Job "SYS"."TSPITR_EXP_nyxF" successfully completed at 09:43:07
Export completed


contents of Memory Script:
{
# shutdown clone before import
shutdown clone immediate
}
executing Memory Script

database closed
database dismounted
Oracle instance shut down

Performing import of metadata...
IMPDP> Master table "SYS"."TSPITR_IMP_nyxF" successfully loaded/unloaded
IMPDP> Starting "SYS"."TSPITR_IMP_nyxF":
IMPDP> Processing object type TRANSPORTABLE_EXPORT/PLUGTS_BLK
IMPDP> Processing object type TRANSPORTABLE_EXPORT/TABLE
IMPDP> Processing object type TRANSPORTABLE_EXPORT/POST_INSTANCE/PLUGTS_BLK
IMPDP> Job "SYS"."TSPITR_IMP_nyxF" successfully completed at 09:43:29
Import completed


contents of Memory Script:
{
# make read write and offline the imported tablespaces
sql 'alter tablespace USERS read write';
sql 'alter tablespace USERS offline';
# enable autobackups after TSPITR is finished
sql 'begin dbms_backup_restore.AutoBackupFlag(TRUE); end;';
}
executing Memory Script

sql statement: alter tablespace USERS read write
sql statement: alter tablespace USERS offline
sql statement: begin dbms_backup_restore.AutoBackupFlag(TRUE); end;

Removing automatic instance
Automatic instance removed
auxiliary instance file D:\ORA11G\DATAFILE\O1_MF_TEMP_6L2M5G8S_.TMP deleted
auxiliary instance file D:\ORA11G\ONLINELOG\O1_MF_3_6L2M5CJM_.LOG deleted
auxiliary instance file D:\ORA11G\ONLINELOG\O1_MF_2_6L2M5BNZ_.LOG deleted
auxiliary instance file D:\ORA11G\ONLINELOG\O1_MF_1_6L2M59N0_.LOG deleted
auxiliary instance file D:\ORA11G\DATAFILE\O1_MF_SYSAUX_6L2M3N1G_.DBF deleted
auxiliary instance file D:\ORA11G\DATAFILE\O1_MF_UNDOTBS1_6L2M3N8S_.DBF deleted
auxiliary instance file D:\ORA11G\DATAFILE\O1_MF_SYSTEM_6L2M3MRW_.DBF deleted
auxiliary instance file D:\ORA11G\CONTROLFILE\O1_MF_6L2M39N0_.CTL deleted
Finished recover at 03-JAN-11

8) Here rman uses transportable tablespace mechanism to plug the dropped tablespace back in to the database.

这里RMAN使用传输表空间将表空间重新插入数据库

SQL> select tablespace_name,status,plugged_in from dba_tablespaces;

TABLESPACE_NAME     STATUS   PLU
----------------    -------  ---
SYSTEM              ONLINE   NO
SYSAUX              ONLINE   NO
UNDOTBS1            ONLINE   NO
TEMP                ONLINE   NO
USERS               OFFLINE  YES  ===> Plugged_in is YES.

 

9) Online the tablespace.

SQL > alter tablespace users online;

 

10) Check for the data.

SQL> conn tiger/tiger
SQL> select count(*) from objects;

COUNT(*)
----------
17299

REFERENCES

NOTE:455865.1 - How to Recover a Drop Tablespace with RMAN