DB2 备份恢复

1. 离线备份

(1) 备份

backup database mydb1 to '/db2/db2inst2/duanbb/backup'

(2) 恢复

restore database mydb1 from '/db2/db2inst2/duanbb/backup'

(3) 备份目录有多个备份版本，恢复指定的版本

[db2inst2@localhost backup]$ ls
MYDB1.0.db2inst2.DBPART000.20150413143601.001  MYDB1.0.db2inst2.DBPART000.20150413144713.001

restore database mydb1 from '/db2/db2inst2/duanbb/backup' taken at 20150413144713

2. 在线备份

(1) 查看是否开启归档

db2 get db cfg for mydb2

下列两个条件，满足一个即为开启归档

• "Log retain for recovery status"项 = "RECOVERY"
• "User exit for logging status" = "YES"
  

(2) 启用归档日志

V9.5之前：

db2 update db cfg for mydb2 using LOGRETAIN ON

V9.5之后

db2 update db cfg for mydb2 using LOGARCHMETH1 LOGRETAIN

(3) 立即做一次离线备份，使归档生效 

db2 backup database mydb2 to '/db2/db2inst2/duanbb/backup'

(4) 在线备份并备份日志

db2 backup db mydb2 online to '/db2/db2inst2/duanbb/backup' include logs

(5) 在线恢复

db2 restore db mydb2 from /db2/db2inst2/duanbb/backup taken at 20150415134135 LOGTARGET /db2/db2inst2/duanbb/backup/log
db2 rollforward db mydb2 to end of logs and stop overflow log path '(/db2/db2inst2/duanbb/backup/log)'

其它相关命令

1. 检查备份版本: db2ckbkp -h <备份文件>

2. 启用归档日志用户出口程序: 

    V9.5前: db2 update db cfg for <dbname> using userexit on

    V9.5后: db2 update db cfg for <dbname> using LOGARCHMETH1 userexit

3. 启用增量备份

     db2 update database configuration for <dbname> using trackmod yes

4. 获取备份历史信息

      db2 list history backup all for database <dbname>

5. 有时离线备份总是报"The database is currently in use"，重启数据库也不管用

    可能是产生了死锁，通过如下命令解锁，然后再重启数据库备份

db2set DB2_RR_TO_RS=YES