12c rac需要强制安装mgmt组建，19c的时候后可以自行选择是否安装，那么如果我们想事后添加mgmt组建，该怎么操作？首先我们得为mgmt划分磁盘，并做好asm绑定。磁盘大小至少28g，生产环境建议100g。 添加方法：
[grid@rac1 soft]$ ./mdbutil.pl --addmdb --target=+MGMT
mdbutil.pl version : 1.99
2020-07-08 09:54:32: I Starting To Configure MGMTDB at +MGMT...
2020-07-08 09:54:39: I Container database creation in progress... for GI 19.0.0.0.0
2020-07-08 10:07:34: I Plugable database creation in progress...
2020-07-08 10:10:53: I Executing "/tmp/mdbutil.pl --addchm" on rac1 as root to configure CHM.
root@rac1's password:
root@rac1's password:
2020-07-08 10:11:41: I Executing "/tmp/mdbutil.pl --addchm" on rac2 as root to configure CHM.
root@rac2's password:
root@rac2's password:
2020-07-08 10:11:56: W Not able to execute "/tmp/mdbutil.pl --addchm" on rac2 as root to configure CHM.
2020-07-08 10:11:56: I MGMTDB & CHM configuration done!
2020-07-08 09:54:39: I Container database creation in progress... for GI 19.0.0.0.0
mdbutil.pl.zip
当然工具可以去mos下载：
MDBUtil: GI Management Repository configuration tool (Doc ID 2065175.1)
