External or Internal IP for Database server machine?

We have a web server machine with firewall controlling our network security. This server gets some critical data from a database server machine located also in the same local network. Which IP is secure for database server, Internal or External IP ?
regards
Siyavuş

Internal IP
For security reasons, is better if you could use a DMZ, with the web server in the DMZ, and the database server in the internal network
Something like this:
Internet <-->external firewall <--> DMZ (web server, mail server, etc) <--> internal firewall <--> LAN (database, pcs, etc)
If you want more granularity, you could incluse put the internal servers in another DMZ

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