[FATAL] [DBT-05511] Specified database (-MGMTDB) does not exist.

Hi everybody

I put on my environment -MGMTDB into +DATA and it took a lot of space. So I tried to recreate it on separate disk group.

Though, when I try to delete my -MGMTDB database it says:

[grid@spb-oracle-node2 bin]$ ./dbca -silent -deleteDatabase -sourceDB -MGMTDB

[FATAL] [DBT-05511] Specified database (-MGMTDB) does not exist.

   ACTION: Provide an existing database.

env:

ORACLE_HOME=/u01/app/12.2.0/grid

GRID_HOME=/u01/app/12.2.0/grid

ORACLE_SID=-MGMTDB

ORACLE_BASE=/home/oracle

when I run "sqlplus / as sysdba" I'm into the "-MGMTDB" database.

SQL> select INSTANCE_NAME from v$instance;

INSTANCE_NAME

----------------

-MGMTDB

when I run just dbca from grid it says: