NBU异机还原oracle问题分析

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今天在执行nbu恢复oracle的问题，发现总是出现问题
恢复脚本是没问题的
RMAN> run
{
allocate channel c1 type 'sbt_tape';
send 'NB_ORA_CLIENT=mytest1';
restore controlfile from '/cntrl_6255_1_880381344';
release channel c1;
}

using target database control file instead of recovery catalog
allocated channel: c1
channel c1: SID=59 device type=SBT_TAPE
channel c1: Veritas NetBackup for Oracle - Release 7.6 (2013111313)

sent command to channel: c1

Starting restore at 22-MAY-15

channel c1: restoring control file
released channel: c1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 05/22/2015 14:45:16
ORA-19870: error while restoring backup piece /cntrl_6255_1_880381344
ORA-19507: failed to retrieve sequential file, handle="/cntrl_6255_1_880381344", parms=""
ORA-27029: skgfrtrv: sbtrestore returned error
ORA-19511: Error received from media manager layer, error text:
   Backup file </cntrl_6255_1_880381344> not found in NetBackup catalog
  
但通过bplist从nbu备份服务器上查看也是可以看到的，但就是报这个错，经过分析，感觉可能是用户的问题，原来备份时的用户是oracle，而现在的恢复环境是oratest。所以新建新建一个oracle用户来，建好后对oracle用户授好权后，再恢复报如下错误：
RMAN> run
{
allocate channel c1 type 'sbt_tape';
send 'NB_ORA_CLIENT=mytest1';
restore controlfile from '/cntrl_6255_1_880381344';
release channel c1;
}

using target database control file instead of recovery catalog
allocated channel: c1
channel c1: SID=59 device type=SBT_TAPE
channel c1: Veritas NetBackup for Oracle - Release 7.6 (2013111313)

sent command to channel: c1

Starting restore at 25-MAY-15

released channel: c1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 05/25/2015 17:23:18
RMAN-06172: no AUTOBACKUP found or specified handle is not a valid copy or piece

后来经过咨询nbu的工程师，得到了答案！

原因是：
1、ORACLE_HOME的属主，要与原环境相同。也就是说原环境中是oracle用户，那么新环境也必须是oracle
2、在使用oracle_link链接时，必须是使用与原环境相同的用户进行执行
2、恢复时，使用的执行用户，必须与原环境相同的用户。

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