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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 16:16:09
ORA-19554: error allocating device, device type: SBT_TAPE, device name:
ORA-27211: Failed to load Media Management Library
Additional 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/hosts
The sbt function pointers are loaded from libobk.so library.
— sbtinit succeeded
— sbtinit (2nd time) succeeded
sbtinit: Media manager supports SBT API version 2.0
sbtinit: Media manager is version 5.0.0.0
sbtinit: vendor description string=Veritas NetBackup for Oracle – Release 7.7.2 (2016011116)
sbtinit: allocated sbt context area of 8 bytes
sbtinit: 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’;
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