简单整理了SAP系统的SID变更步骤，真正作的时候需要考虑的很多，所以我觉得在每次要变更SID之前，最好写详细的Senario。而且，在作的时候也把时间都记录。
这里省略了变更SID之后，在SAP系统上作的操作。

 

1. backup controlfile

SVRMGR> ALTER DATABASE BACKUP CONTROLFILE TO TRACE;
SVRMGR> SHUTDOWN IMMEDIATE;

modify backup control file sql script
a. CREATE CONTROLFILE REUSE DATABASE "OLD_DB_NAME" NORESETLOGS;
->CREATE CONTROLFILE SET DATABASE "NEW_DB_NAME" RESETLOGS;
b. RECOVER DATABASE;
->RECOVER DATABASE USING BACKUP CONTROLFILE UNTIL CANCEL;
c. <OLD_SID> -> <NEW_SID>
ALTER DATABASE OPEN;
->ALTER DATABASE OPEN RESETLOGS;

2.umount old filesystem

3. Create oracle<SID>, <SID>adm User

4.mount new filesystem

5.execute backup control file sql

6.relink

7.Link check :

(1) cd /usr/sap/<SID>/SYS
# ln -s /sapmnt/<SID>/global global
# ln -s /sapmnt/<SID>/profile profile
(2) cd /usr/sap/<SID>/SYS/exe
# ln -s /sapmnt/<SID>/exe dbg

8.Check <sid>adm user environment.

.cshrc, .kshrc, .login, .profile, .dbenv_<hostname>.sh, .dbenv_<hostname>.csh, .sapenv_<hostname>.sh .sapenv_<hostname>.csh

9.Modify R/3 parameters

: startsap_<hostname>_<system no>, stopsap_<hostname>_<system no>
: DEFAULT.PFL, TEMU.PFL
: START_D<VEBMGS><system no>_<hostname>, <SID>_D<VEBMGS><system no> ...

10.Check files (/etc/hosts, /etc/services)

11.saplicense install