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分类: Oracle

2014-02-26 11:50:03

                                       ORACLE 12C使用RMAN进行表恢复

     在12C以前的版本中,rman可以进行db,tablespace,datafile,block级别和TSPITR的恢复,12C引入了table级别的恢复
在没有打开flashback的时候,可以进行单个表的恢复.
 
例,创建表


SQL>  alter session set container=pdb2;

Session altered.

SQL> create table frank.t1 as select * from dba_tables;

Table created.


备份数据库

RMAN> backup database;

Starting backup at 16-JAN-14
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=265 device type=DISK
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00003 name=/u01/app/oracle/oradata/c12/sysaux01.dbf
input datafile file number=00001 name=/u01/app/oracle/oradata/c12/system01.dbf
input datafile file number=00004 name=/u01/app/oracle/oradata/c12/undotbs01.dbf
input datafile file number=00038 name=/home/oracle/t1.dbf
input datafile file number=00006 name=/u01/app/oracle/oradata/c12/users01.dbf
input datafile file number=00014 name=/u01/app/oracle/product/12.1.0/db_1/dbs/test

....................

查询当前数据库的scn号

SQL> select current_scn from v$database;

CURRENT_SCN
-----------
    4898443


SQL> drop table frank.t1;

 


[oracle@o12c ~]$ mkdir /home/oracle/abc


RMAN> recover table frank.t1 of pluggable database pdb2
2>  until scn 4898443
3>  auxiliary destination '/home/oracle/abc'
4>   datapump destination '/home/oracle/abc';

Starting recover at 16-JAN-14
using channel ORA_DISK_1
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='vewD'

initialization parameters used for automatic instance:
db_name=C12
db_unique_name=vewD_pitr_pdb2_C12
compatible=12.1.0.0.0
db_block_size=8192
db_files=200
sga_target=1G
processes=80
diagnostic_dest=/u01/app/oracle
db_create_file_dest=/home/oracle/abc
log_archive_dest_1='location=/home/oracle/abc'
enable_pluggable_database=true
_clone_one_pdb_recovery=true
#No auxiliary parameter file used


starting up automatic instance C12

Oracle instance started

Total System Global Area    1068937216 bytes

Fixed Size                     2296576 bytes
Variable Size                281019648 bytes
Database Buffers             780140544 bytes
Redo Buffers                   5480448 bytes
Automatic instance created

contents of Memory Script:

..............................................................


也是会新建一个auxiliary  instance,然后在auxiliary instance上做全库恢复,再通过datapump工具导出和导入
整个过程和TSPITR极为相似.

恢复成功,再次查询


SQL> select count(*) from frank.t1;

  COUNT(*)
----------
        2318

注意common user引用表的名称为 "c##frank".t1,而不是"c##frank.t1",否则会报以下错误
RMAN> recover table "c##frank.t1" until scn 4894140 auxiliary destination '/home/oracle/abc' datapump destination '/home/oracle/abc';

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00558: error encountered while parsing input commands
RMAN-01009: syntax error: found "until": expecting one of: "dot"
RMAN-01007: at line 1 column 29 file: standard input

 

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