Web service VS Direct DB access

Hi,
I am completely new to data warehouse.
Recently, i need to build a data warehouse that get data from one of the transaction databases for data analysis.
I am struggling whether i should get the required data by web service or directly access the database. Could anyone advise please? Thanks.
Regards,
Shirley

Hi Hua Min,
Thanks for your reply.
I am sorry that i haven't make my question clear. Let me describe more detail here.
In my data warehouse project, data is extracted from a system (e.g. SystemA) that containing all the transactions information to the database of my data warehouse for further data analysis. I am thinking of two ways to access the required data from
SystemA. 1) SystemA provides some web services for required data retrieval or 2) Create a read-only database access role in the database of SystemA for my ETL tool to connect to SystemA's DB directly to grab the required data. Both ways should work but I am
not sure which way is a better way. Thanks.
Regards,
Shirley

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