Generally, .dbc files are classified in 2 types with accordance of their parametric value for fixed_size_dml which can be either true or false.
If the value is false, the database generates delimited types whenever possible(it recognizes null as zero-length string).
In case of true, it takes fixed length dml.
Other parameters for .dbc files are:
dbms
db_version
db_home
db_name
db_nodes
User & password
case
generate_dml_with_nulls
fixed_size_dml
treat_blanks_as_null
oldstyle_emptystring_as_null
fully_qualify_dml
delimited_dml_with_maximum_size
interface
environment
direct_parallel
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types of .dbc file mainly depends on connection from ETL server to multiple Databse like ..Oracle,DB2.Redbricks....
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First of all how did you come to know there are two types of DBC files.. Moreover all answers provided are incorrect!!

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We don't have diff types of dbc file. We have only one dbc file which is used to connect the component in the GDE with particular database
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.dbc file is database configuration file. In this file, information to connect the database is given.
Types of files:
1. Fixed length file
2. Delimited file
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