使用DB2 RESTORE 克隆数据库

使用DB2 RESTORE 克隆数据库

开发team需要克隆一个数据库，只更改库名，但是库里面的信息如表空间，表等对象不做变化。经指导可以使用RESTORE REDIRECT进行数据库克隆。重定向恢复操作核心步骤有三步，包括两步数据库恢复过程，一个表空间容器重定义：1）带 REDIRECT 选项发出 RESTORE DATABASE 命令。2）使用 SET TABLESPACE CONTAINERS 命令来定义被恢复的数据库的表空间容器（克隆库的存放位置有关）。3）再次发出 RESTORE DATABASE 命令，这次指定 CONTINUE 选项。需要注意的是整个重定向恢复操作要在同一个session中，否则恢复操作会失败。
具体步骤如下：1. 备份数据库db2 backup db testdb online2. 使用RESTORE重定向进行克隆db2 restore db testdb taken at 20151202102547 dbpath on /disk2/testdbz/ into testdbz redirectSQL1277W A redirected restore operation is being performed. During a table space restore, only table spaces being restored can have their paths reconfigured. During a database restore, storage group storage paths and DMS table space containers can be reconfigured.DB20000I The RESTORE DATABASE command completed successfully.3. 在另一个session中查看testdb表空间容器信息查看原库表空间容器：0x00007F252DEF9120 0 0 File 131072 131040 - 0 /disk1/testdb/syscatspace_c10x00007F252DEF9780 1 0 Path 1 1 - 0 /disk1/testdb/tempspace10x00007F252DEDAC60 2 0 File 262144 262112 - 0 /disk1/testdb/userspace_c10x00007F252DED69E0 3 0 File 2621440 2621408 - 0 /disk1/testdb/cas_data8k_c10x00007F252DED2B80 4 0 File 4096 4092 - 0 /disk1/testdb/db2inst1/NODE0000/SQL00001/SYSTOOLSPACE0x00007F252DED17A0 5 0 File 2621440 2621408 - 0 /disk1/testdb/cas_idx8k_c14. 重定向克隆库容器：db2 "set tablespace containers for 0 using ( file '/disk2/testdbz/syscatspace_c1' 131072)"db2 "set tablespace containers for 1 using ( path '/disk2/testdbz/tempspace1')" db2 "set tablespace containers for 2 using ( file '/disk2/testdbz/userspace_c1' 262144)" db2 "set tablespace containers for 3 using ( file '/disk2/testdbz/cas_data8k_c1' 2621440)"db2 "set tablespace containers for 4 using ( file '/disk2/testdbz/db2inst1/NODE0000/SQL00001/SYSTOOLSPACE' 4096)"db2 "set tablespace containers for 5 using ( file '/disk2/testdbz/cas_idx8k_c1' 2621440)"5. 继续restore：db2 restore db testdb continue
6. 前滚：db2 "rollforward db testdbz to end of logs and complete"此处可能会报错：log missingSQL1273N An operation reading the logs on database "testdbZ" cannot continue because of a missing log file "S0000000.LOG" on database partition "0" and log stream "0".从原库中将missing的log拷贝到克隆库的日志存放目录即可。lsS0000000.LOG S0000002.LOG S0000004.LOG S0000006.LOG S0000008.LOG S0000010.LOG S0000012.LOGS0000001.LOG S0000003.LOG S0000005.LOG S0000007.LOG S0000009.LOG S0000011.LOG S0000013.LOGcp S0000000.LOG /disk2/testdbz/db2inst1/NODE0000/SQL00001/LOGSTREAM0000/
7. 继续前滚db2 "rollforward db testdbz to end of logs and complete" Rollforward Status Input database alias = testdbz Number of members have returned status = 1 Member ID = 0 Rollforward status = not pending Next log file to be read = Log files processed = S0000000.LOG - S0000000.LOG Last committed transaction = 2015-12-02-02.25.49.000000 UTCDB20000I The ROLLFORWARD command completed successfully.至此testdb的克隆库testdbz就建好了。