最近在做NBU ORACLE备份的恢复测试，执行恢复时报错ORA-27211: Failed to load Media Management Library，具体处理过程如下：
一、错误信息

执行命令：

run {ALLOCATE CHANNEL ch00 TYPE SBT_TAPE;send ‘NB_ORA_CLIENT=192.168.x.x‘;send ‘NB_ORA_SERV=nbu5230‘;restore controlfile from ‘/ctrl_dTESTDB_u0at7lkpa_s10_p1_t981127978‘;release channel ch00;}

报错信息：

RMAN-00571: ===========================================================RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============RMAN-00571: ===========================================================RMAN-03009: failure of allocate command on ch00 channel at 07/10/2018 16:16:09ORA-19554: error allocating device, device type: SBT_TAPE, device name:ORA-27211: Failed to load Media Management LibraryAdditional information: 2

二、错误原因

由于数据库的Lib库不包含NBU的库文件，所以执行rman恢复时报错

三、解决方案

将NBU的库文件放入Oracle库文件目录下即可

[oracle@node1 oracle]$ ln -s /usr/openv/netbackup/bin/libobk.so64  /U01/app/oracle/product/11.2.0.4/lib/libobk.so
[oracle@node1 oracle]$ sbttest /etc/hosts

[oracle@node1 oracle]$ sbttest /etc/hostsThe sbt function pointers are loaded from libobk.so library.-- sbtinit succeeded-- sbtinit (2nd time) succeededsbtinit: Media manager supports SBT API version 2.0sbtinit: Media manager is version 5.0.0.0sbtinit: vendor description string=Veritas NetBackup for Oracle - Release 7.7.2 (2016011116)sbtinit: allocated sbt context area of 8 bytessbtinit: proxy copy is supported-- sbtinit2 succeeded-- regular_backup_restore starts ................................

四、知识扩展

1.NBU数据库恢复脚本

run {allocate channel t1 type ‘sbt_tape‘;allocate channel t2 type ‘sbt_tape‘;allocate channel t3 type ‘sbt_tape‘;send ‘NB_ORA_CLIENT=192.168.x.x‘;send ‘NB_ORA_SERV=nbu5230‘;set until sequence 12 thread 1;restore database;#switch datafile all;recover database;release channel t1;release channel t2;release channel t3;}

2.归档日志恢复

run {allocate channel t1 type ‘sbt_tape‘;allocate channel t2 type ‘sbt_tape‘;send ‘NB_ORA_CLIENT=192.168.x.x‘;send ‘NB_ORA_SERV=nbu5230‘;restore archivelog from sequence 8 until sequence 12 INCARNATION ALL;release channel t1;release channel t2;}

3.其他恢复

更改还原路径：RMAN> set archivelog destination to ‘/u01/backup‘;还原全部备份归档：RMAN> restore archivelog all;归档日志范围恢复：RMAN> restore archivelog from sequence 8 until sequence 12;RMAN> restore archivelog sequence between 8 and 12;从低sequence开始恢复：RMAN> restore archivelog from sequence 5;RMAN> restore archivelog low sequence 5;从高sequnece截止恢复：RMAN> restore archivelog until sequence 110;RMAN> restore archivelog high sequence 108;按时间恢复：RMAN> restore archivelog from time ‘sysdate-7‘;