表空间基于时间点的恢复(TSPITR)
环境：RHEL 6.4 + Oracle 11.2.0.4
- 准备模拟环境
- 1. 验证表空间的依赖性
- 2. 确定执行TSPITR后会丢失的对象
- 3. 自动执行TSPITR
- Reference
准备模拟环境
0.1 初始化表空间，用户，表，数据
初始化参考 模拟业务最小测试用例01 文章中的第1，2，3，4，5步骤初始化模拟环境。
0.2 再建立一个表空间，模拟生产环境其他表空间
-- 创建表空间
conn /as sysdba
create tablespace dbs_d_test datafile size 30M autoextend off;0.3 数据库确定存在有效RMAN备份
RMAN> backup database;
RMAN> list backup of database;0.4 误操作截断核心表T2
-- 误操作truncate核心业务表T2
conn jingyu/jingyu
alter session set NLS_DATE_FORMAT="YYYY-MM-DD HH24:Mi:SS";
select sysdate from dual;
truncate table t2;
-- 之后创建T3表在dbs_d_test表空间
create table T3 tablespace dbs_d_test as select * from t1;0.5 需求
恢复核心表T2（T2表数据存在DBS_D_JINGYU表空间, 索引存在DBS_I_JINGYU表空间）
采用表空间基于时间点的恢复技术，正常的话T3表（在表空间DBS_D_TEST）应该不受影响。
-- 查询现状：当前表T2，T3数据量（表T2已被截断，已经没有数据；表T3在T2被截断后创建，有数据）
conn jingyu/jingyu
select count(1) from t2;
select count(1) from t3;1. 验证表空间的依赖性
1.1 查询 TS_PITR_CHECK
conn / as sysdba
set linesize 1000
col obj1_owner for a10
col obj2_owner for a10
-- 如果只恢复表空间DBS_D_JINGYU
select OBJ1_OWNER, OBJ1_NAME, TS1_NAME, OBJ2_OWNER, OBJ2_NAME, TS2_NAME
from TS_PITR_CHECK
where (ts1_name = 'DBS_D_JINGYU' and ts2_name != 'DBS_D_JINGYU') or (ts1_name != 'DBS_D_JINGYU' and ts2_name = 'DBS_D_JINGYU');
-- 如果恢复表空间DBS_D_JINGYU,DBS_I_JINGYU
select OBJ1_OWNER, OBJ1_NAME, TS1_NAME, OBJ2_OWNER, OBJ2_NAME, TS2_NAME
from TS_PITR_CHECK
where (ts1_name in ('DBS_D_JINGYU','DBS_I_JINGYU') and ts2_name not in ('DBS_D_JINGYU','DBS_I_JINGYU')) or (ts1_name not in ('DBS_D_JINGYU','DBS_I_JINGYU') and ts2_name in ('DBS_D_JINGYU','DBS_I_JINGYU'));1.2 处理依赖关系
可以看到，如果只恢复表空间DBS_D_JINGYU，会有T2表的索引依赖表空间DBS_I_JINGYU。
我们这里同时恢复表空间DBS_D_JINGYU,DBS_I_JINGYU，这样就解决了依赖关系。
2. 确定执行TSPITR后会丢失的对象
2.1 查询 TS_PITR_OBJECTS_TO_BE_DROPPED
-- 查询执行TSPITR后会丢失的对象
select owner, name, tablespace_name, creation_time
from TS_PITR_OBJECTS_TO_BE_DROPPED
where tablespace_name in ('DBS_D_JINGYU','DBS_I_JINGYU')
and creation_time > to_date('2015-11-11 15:01:46','yyyy-mm-dd hh24:mi:ss');2.2 预处理执行TSPITR后会丢失的对象
我这里没有查出结果，如果有结果，最好先expdp导出这些对象的备份，待恢复表空间后，再导入这些对象。
当然如果确定这些对象是没有用的，可以直接忽略。
3. 自动执行TSPITR
3.1 RMAN自动执行TSPITR
恢复表空间DBS_D_JINGYU, DBS_I_JINGYU到2015-11-11 15:01:46时间点，辅助实例的临时存放目录为/u01/orabak/auxiliary
recover tablespace DBS_D_JINGYU, DBS_I_JINGYU until time '2015-11-11 15:01:46' auxiliary destination '/u01/orabak/auxiliary';执行过程简要输出如下：
$ rman target / catalog vpc1/vpc1@catdb
Recovery Manager: Release 11.2.0.4.0 - Production on Wed Nov 11 15:39:27 2015
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
connected to target database: ORADB (DBID=2647366668)
connected to recovery catalog database
RMAN>
RMAN> recover tablespace DBS_D_JINGYU, DBS_I_JINGYU until time '2015-11-11 15:01:46' auxiliary destination '/u01/orabak/auxiliary';
Starting recover at 2015-11-11 15:03:29
using channel ORA_DISK_1
Creating automatic instance, with SID='nysi'
initialization parameters used for automatic instance:
db_name=ORADB
db_unique_name=nysi_tspitr_ORADB
compatible=11.2.0.4.0
db_block_size=8192
db_files=200
sga_target=1G
processes=80
db_create_file_dest=/u01/orabak/auxiliary
log_archive_dest_1='location=/u01/orabak/auxiliary'
#No auxiliary parameter file used
...此省略大量输出内容
Removing automatic instance
Automatic instance removed
auxiliary instance file /u01/orabak/auxiliary/ORADB/datafile/o1_mf_temp_jin_c45t4498_.tmp deleted
auxiliary instance file /u01/orabak/auxiliary/ORADB/datafile/o1_mf_temp_c45t4486_.tmp deleted
auxiliary instance file /u01/orabak/auxiliary/ORADB/onlinelog/o1_mf_3_c45t43b3_.log deleted
auxiliary instance file /u01/orabak/auxiliary/ORADB/onlinelog/o1_mf_2_c45t42z3_.log deleted
auxiliary instance file /u01/orabak/auxiliary/ORADB/onlinelog/o1_mf_1_c45t42gx_.log deleted
auxiliary instance file /u01/orabak/auxiliary/ORADB/datafile/o1_mf_sysaux_c45t2wr3_.dbf deleted
auxiliary instance file /u01/orabak/auxiliary/ORADB/datafile/o1_mf_undotbs1_c45t2wrf_.dbf deleted
auxiliary instance file /u01/orabak/auxiliary/ORADB/datafile/o1_mf_system_c45t2wr9_.dbf deleted
auxiliary instance file /u01/orabak/auxiliary/ORADB/controlfile/o1_mf_c45t2hn2_.ctl deleted
Finished recover at 2015-11-11 15:06:223.2 备份表空间然后使表空间联机
-- 备份表空间DBS_D_JINGYU, DBS_I_JINGYU
RMAN> backup tablespace dbs_d_jingyu, dbs_i_jingyu;
-- 表空间DBS_D_JINGYU联机
RMAN> sql 'alter tablespace dbs_d_jingyu online';
-- 表空间DBS_I_JINGYU联机
RMAN> sql 'alter tablespace dbs_i_jingyu online';3.3 验证结果
-- 最后验证
conn jingyu/jingyu
select count(1) from t2;
select count(1) from t3;结果是：
SQL> conn jingyu/jingyu
SQL> select count(1) from t2;
COUNT(1)
----------
100000
Elapsed: 00:00:00.01
SQL> select count(1) from t3;
COUNT(1)
----------
100
Elapsed: 00:00:00.01至此成功执行了表空间基于时间点的恢复：T2表数据已经恢复，T3表数据未受影响。
Reference
- OCP 认证考试指南 (1Z0-053)[M]. 清华大学出版社, 2010.