To use DBCA in silent mode and you want the database stored in the ASM +DGDATA diskgroup follow the next Correct Format for Examples: If I already have an ASM instance/diskgroup then the following creates a single database on that diskgroup:
$ dbca -silent -createDatabase -templateName General_Purpose.dbc -gdbName ORCL -sid ORCL -SysPassword change_on_install -SystemPassword manager -emConfiguration NONE -storageType ASM -asmSysPassword change_on_install -diskGroupName DGDATA -characterSet WE8ISO8859P15 -memoryPercentage 40
From Oracle
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